| 00:00 | I did um I did a scan my machine uh C. F. |
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| 00:11 | . F. C. Scan through administrator window and it found some corrupt |
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| 00:19 | and fixed them. Excuse me. I was hoping, I mean because |
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| 00:25 | know I remember my machine crashed the day and the Windows Explorer had been |
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| 00:31 | funny. So I did some searching and I found that there is a |
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| 00:36 | that you can do a administrator scan the what he called the the what |
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| 00:49 | it here? It's the power The Windows power shell. So you |
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| 00:53 | go into this power shell and you do a scan and it will fix |
|
| 00:57 | . So I did that and I'm that my machine doesn't crash today doesn't |
|
| 01:04 | itself. Cross your fingers. This um it's a little frustrating but it's |
|
| 01:12 | of like late in the day to to you know redo I guess I |
|
| 01:18 | I guess I could launch this from computer. I have another machine here |
|
| 01:24 | maybe I'll do that. If it again today then I'll do the next |
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| 01:29 | with a different computer. So although is the one I'd like to work |
|
| 01:34 | because it has anyways whatever. Okay questions about anything Stephanie um exam or |
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| 01:44 | or whatever. Um I don't think . Um So your you don't want |
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| 01:57 | complain about the exam being too long too stupid or whatever. No I |
|
| 02:02 | the exam is fine. I got on that one question but I think |
|
| 02:06 | was just overthinking it. Um The question that I couldn't really answer was |
|
| 02:12 | 20 where I would suggest an enhancement to compare marine deep tail versus surface |
|
| 02:18 | . That was like I skipped that . I came back to at the |
|
| 02:21 | end and I just, I had to give it. So I didn't |
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| 02:27 | like what to do there. So . Um so continuation didn't cross your |
|
| 02:48 | . No. Does it make sense ? Yeah, downward continue or offer |
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| 02:57 | compared. Yeah. Okay. Well sorry about that. Um Okay |
|
| 03:06 | . So now you've got, you're to install the software and um you're |
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| 03:13 | a machine that has the software installed now. Yes. He was able |
|
| 03:18 | do the shell. So I'm I'm on my Mac in a show |
|
| 03:22 | so you're able to launch the And did you did you already start |
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| 03:29 | creative project? Yes, I already that. And the project is in |
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| 03:34 | folder where the model files are. . I'm pretty sure that's what I |
|
| 03:42 | . Well I did like the file New and then I just like did |
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| 03:48 | , exercise one. Okay. You it in there because I mean the |
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| 03:53 | is like the is like the bin for the software installation which is where |
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| 03:59 | the all the DLL S and E E S R. I mean the |
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| 04:04 | , I mean it's just a dumb to do. I don't know why |
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| 04:07 | why they do that. I mean , so so new and then I'm |
|
| 04:14 | to do that right now so you see so let me see here, |
|
| 04:17 | gonna go up to here too. see. You have a judge and |
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| 04:24 | in the exercise. Okay so I'm gonna call this one professional masters 2023 |
|
| 04:34 | it will create a project in that where I just went to the exercise |
|
| 04:42 | . So if you've done that then be in good shape for the |
|
| 04:48 | Did you did you also add the from the menu list? Yes I'm |
|
| 04:54 | I was going off of the email now that I'm looking at the |
|
| 04:57 | I didn't add the G. Systems profile yet so I guess I |
|
| 05:01 | to do that. So you go settings and then it says manage |
|
| 05:08 | Are you doing it right now? . Oh it did at it. |
|
| 05:11 | . Never mind. I did Right okay. Yeah manage menus and |
|
| 05:15 | you go down here and you hit extensions here and G. M. |
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| 05:19 | . Profile modeling, click that and will add that venue to the drop |
|
| 05:25 | . Okay. I'm gonna put you my ipad so I can watch you |
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| 05:31 | do my computer. Yeah that's gonna that's a really really good idea because |
|
| 05:38 | kind of hard to go back and from the lecture to the modeling. |
|
| 05:42 | . Yeah. Yeah. Yeah. great. Um Okay so this is |
|
| 05:50 | to go and when we get there do this. But I got some |
|
| 05:56 | notes to go through first and then not that man. But I'm |
|
| 06:01 | Did you have a chance to look the lecture notes for the modeling |
|
| 06:05 | Not not yet. I kind of was blazing through them before class. |
|
| 06:12 | ? Can you hear me? Yeah can't, what did you say? |
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| 06:15 | I said I haven't like completely read it but I started glancing through them |
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| 06:20 | class. Okay. Alright so then yeah I can go, let's just |
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| 06:27 | through the let's just get started Um sounds like your software is cooking |
|
| 06:32 | we're ready to ready to go and kind of like the you know that's |
|
| 06:36 | big part of this is just getting it going but I've been doing this |
|
| 06:41 | know for C since 20 since 2005 I've been doing it um Yeah like |
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| 06:52 | is the beginning of the year 18 I've been doing and stuff. So |
|
| 06:59 | now sequence used to be known as soft and sequence has changed parent companies |
|
| 07:09 | one time since they were bought And so I don't know I mean |
|
| 07:15 | have new hurdles for me to jump but I mean it's like I tell |
|
| 07:19 | I said look at this is this a complete totally win win because I |
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| 07:25 | people how to use their software and expense to them. And I do |
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| 07:30 | because I think it's important for students get a hand, get a, |
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| 07:34 | a feel for the kind of how geometries and dense and you know, |
|
| 07:40 | properties changed anomalies produce anomalies. And the easiest way the best way to |
|
| 07:48 | that is just to get some hands instruction and to just playing around with |
|
| 07:54 | and and looking to see how how the, how the anomalies are |
|
| 08:00 | by changing rock properties or the whatever layer shapes and there's just really no |
|
| 08:09 | for that sort of experience. And so that's why I go to some |
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| 08:16 | effort to try to get this modeling there because I think it's just so |
|
| 08:20 | for you to I mean it really of makes you understand the data a |
|
| 08:26 | bit better. And so we have thanks to sequence for doing this. |
|
| 08:31 | know it's they have to, you , it's kind of an effort on |
|
| 08:34 | part to mess around with this because done. You know, they don't |
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| 08:38 | any money on it, but they doesn't cost them anything either other than |
|
| 08:42 | time it takes to set up the . And it used to be a |
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| 08:46 | simpler, but now they have like they have a bookkeeping thing, they |
|
| 08:50 | to keep track of these things, know, so that's kind of a |
|
| 08:57 | because that just basically means that, know the bookkeepers are driving I mean |
|
| 09:07 | still getting, can you hear Yes? Can you hear me |
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| 09:17 | Yeah I keep getting messages that that I'm gonna I'm gonna take off my |
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| 09:27 | I'm gonna turn my I'm gonna turn video off. Okay. I turned |
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| 09:34 | video off. Does that help? haven't really noticed any problems on my |
|
| 09:42 | yet but I will let you know I can't hear you or anything. |
|
| 09:47 | . So I mean this is I because I'm running the software, I'm |
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| 09:54 | resources and there's nothing I can do that. So but everything else is |
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| 09:59 | um Yeah everything else. Okay. well we'll just drive forward so thanks |
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| 10:07 | sequence and then um we'll just go . Alright so let's talk about our |
|
| 10:13 | area for the modeling study and it's santos basin which is a passive margin |
|
| 10:19 | brazil, southeast brazil, it's a basin. And it's the passive margin |
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| 10:28 | course it's a the south atlantic opened in the cretaceous roughly around 1:30 a.m. |
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| 10:36 | . And the data over the basin open file marine track line data. |
|
| 10:41 | it's good quality data. Now I some grids as well. Those are |
|
| 10:45 | file grids. Some are not some are good um But yeah so |
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| 10:52 | land part remember this is pavel is the developed from the oil and the |
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| 10:58 | gravity over the marine parts where our marine. So it's it's okay but |
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| 11:05 | but these are the grids are using bear in mind the track line coverage |
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| 11:09 | other words actual ship track marine Those are the data in our |
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| 11:17 | And then there is some refraction data we can kinda have control in the |
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| 11:22 | and base of crust geometries. It's a paper in 17. It's an |
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| 11:28 | paper but the data is still So we're going to start with gravity |
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| 11:34 | . And unlike what you would say for like seismic data where you would |
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| 11:40 | know start defining you know strata graphic from the top to the bottom top |
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| 11:46 | down with gravity. We start from bottom up because you want to get |
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| 11:50 | long wavelengths captured you know fit first a crossword geometries and then we're gonna |
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| 11:58 | complexity as we go up and that's the way we think about modern |
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| 12:04 | And then for magnetic two D. Which I'll tell you right up |
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| 12:09 | I'm not crazy about 2D gravity magnetic because I'm not sure how much you |
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| 12:13 | learn from it. Um mostly magnetic in my view is good for estimating |
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| 12:20 | steps to you know magnetic bodies or I said also train mapping but people |
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| 12:30 | make two D. Models and we'll it and then maybe you'll have a |
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| 12:34 | a better understanding of why it's I'm too crazy about it but we're gonna |
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| 12:37 | it because I think it's again, can still get a feel for how |
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| 12:42 | magnetic susceptibilities and you know those how those affect the models and how |
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| 12:48 | the magnetic field really is, how much different it is from gravity. |
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| 12:54 | it's you may not think it may seem like they're that much different ones |
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| 13:00 | or ones die poor but making the bipolar really complicated. So we'll have |
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| 13:05 | we'll get a feel for that as . So here's the study area. |
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| 13:10 | again, this is brazil and this a passive margin and just Stempel I |
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| 13:17 | this hash mark hash shirt area. that's the paranal flood basalt. And |
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| 13:22 | gonna get into that in more detail afternoon. But this dash line is |
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| 13:27 | outline of the santos and Campos The Campos basin is up here and |
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| 13:32 | santos is this big broad basin down And then there's the refraction stations are |
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| 13:39 | inverted triangles and they're they're reverse In other words, they had |
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| 13:46 | They have receivers at both end of profiles but they but then they just |
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| 13:51 | are also locations of the source. probably dynamite 1971. So they had |
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| 13:58 | receiver here and dynamite hair and then reversed the profile and dynamite here receiver |
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| 14:07 | in the north. So that is that is a typical way of doing |
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| 14:12 | because when you, because if you the profile then with refraction data you |
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| 14:18 | figure out the dip of the layers it in refraction data. I don't |
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| 14:23 | if you familiar with it but you're velocities directly, right? It's not |
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| 14:30 | from travel time curves and those sort things like you do with reflection |
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| 14:35 | But you are measuring velocities of earth directly. And then you can just |
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| 14:43 | mean you can look up in a handbook about refraction data but it's really |
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| 14:48 | data. It's it's really good It's really cool in any case. |
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| 14:53 | Yeah the salt is actually the data actually the salt limit. Now there's |
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| 14:58 | geomagnetic Aisa crowns. Remember from sea spreading. That's these dotted lines. |
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| 15:03 | this is M. Zero. Which remember the first Mesozoic crown after the |
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| 15:09 | quiet zone. And then this is . Four. And it's a little |
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| 15:12 | down here. Um Yeah, okay this is um gravity anomalies. This |
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| 15:20 | boo gay land and free air off here in the marine areas. That |
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| 15:26 | . And you can just see, yeah in the red line by the |
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| 15:31 | that that is our model location. is where R. Two D. |
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| 15:35 | location. So it goes right across salt basin out over ocean floor. |
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| 15:41 | and then right into the, you , thicker continental crust. So |
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| 15:45 | so here's the free air. And course you can see the oceanic fracture |
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| 15:49 | are really, you know really uh defined quite well. And then this |
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| 15:57 | this North South Treasure. This is an extinct spreading center. So there |
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| 16:02 | a ridge jump. Remember we talked that? So once again because we |
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| 16:07 | went through all that detail about the of the sea floor, you can |
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| 16:12 | where it's where it's affecting exploration. have these oceanic fracture zones which are |
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| 16:18 | off axis traces. They're not they're false. Right? Remember, because |
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| 16:23 | the off axis part. We have extinct spreading center. So and then |
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| 16:28 | course you have these seamounts out. we talked about hotspot tracks and |
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| 16:34 | So you can begin to see the why I went into all that detail |
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| 16:39 | ocean basins and the sort of geology you expect to see produced by just |
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| 16:46 | features out there. This is this might here might be like a transverse |
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| 16:53 | . Okay, so let's look at bug a then, remember bouquet is |
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| 16:59 | minimizes topographic. So what you're seeing the long wavelength is broad. High |
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| 17:06 | here in the east, plunging down the continent is broad. Low. |
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| 17:11 | it's like the long wavelength, the wavelengths in the bouquet is kind of |
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| 17:16 | facto uh telling you how you know deep the how thick the crust is |
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| 17:22 | . Right. And then of I think we're gonna never look at |
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| 17:27 | magnetic data and the regional magnetic data very average. Um It's E mag |
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| 17:35 | here and uh e. m. 2008 for land areas. But you |
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| 17:42 | still see some of the morphology in ocean basin. But you don't really |
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| 17:47 | a sense that you know I mean this were a high quality magnetic data |
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| 17:53 | would have short wavelengths out here and wavelengths showing you the shape of the |
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| 17:59 | in here. You don't really see with these data. It's just not |
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| 18:02 | good data. It's very average. our residual so I should have switched |
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| 18:09 | slides in the wrong order. This be right after the bouquet. This |
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| 18:12 | the residual bouquet and you can really a lot of the features. Now |
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| 18:21 | you're seeing right here. You see sort of sort of yellowish broad circular |
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| 18:29 | here. And then of course you the blue one here. So the |
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| 18:34 | is deeper here. But this is a plateau which is called the Sao |
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| 18:39 | plateau. And it is a bit foundered crust. In other words there |
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| 18:44 | some rifting in here. In fact up into here this high here is |
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| 18:49 | ocean floor. So there was when basin opened up when the south atlantic |
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| 18:55 | producing ocean floor drifting apart. That there was rifting in here. But |
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| 19:01 | that rifting jumped out board here. this is a bit of continental crust |
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| 19:06 | been ripped it away. So there two riffs on either side here. |
|
| 19:11 | that makes sense to you here. What is what is this one? |
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| 19:18 | I'm sorry, I'm sorry, I'm sorry. This is. Let me |
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| 19:22 | back over. This is the this is the regional bouquet anomalies. |
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| 19:26 | not Maggie, I'm sorry, my . This is the region. This |
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| 19:29 | a long way like this. Just to crustal thickness. Okay, now |
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| 19:33 | the residual. So subtracting that from gives us that man, I messed |
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| 19:40 | up. Sorry about that. so right, so this is the |
|
| 19:44 | from that. Now look at the data and yeah, it's it's still |
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| 19:50 | see that you don't really get a for longer wavelengths in here. So |
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| 19:57 | mean that but here's the Sao Paulo Sao Paulo ridge is um a |
|
| 20:05 | a metric feature right here. The Paulo ridge goes through right here. |
|
| 20:12 | um it is a marginal ridge. we talked about marginal ridges, |
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| 20:17 | ocean boundaries there? It is right , it's a little marginal ridge because |
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| 20:21 | ocean floor to the south, wherever see a fracture zone. You know |
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| 20:26 | at least one side of it is . That's that's you know if you |
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| 20:32 | Cron's all the way in here, floor spreading on that one. That |
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| 20:35 | the ocean crust goes all the way here. So this is a marginal |
|
| 20:39 | . This, so a fracture on least one side has to be |
|
| 20:45 | there's no other way to do So and then but this is the |
|
| 20:48 | Power Plateau and this is the southernmost of it. Is this ridge that |
|
| 20:53 | . And you can see it produces nice residual that you can map pretty |
|
| 20:59 | nicely. And you can try now can trace these fractures on all the |
|
| 21:03 | into here, at least this So um Right. And then I |
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| 21:11 | know, I mean you don't really this, See this is a Cron |
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| 21:18 | is a negative anomaly. Right? mean because it's it's the long normal |
|
| 21:24 | cretaceous quiet on is all positive. you don't see any sea floor spreading |
|
| 21:29 | out here because there aren't any but . Zero is supposed to be |
|
| 21:33 | So my guess is that these this through here, then maybe down into |
|
| 21:39 | is actually, you know, kind reflects that even though there's some |
|
| 21:44 | So this this this data line is interpreted from a continuous bunch of |
|
| 21:52 | There's track lines that is defined Okay. And then the Sao Paulo |
|
| 22:01 | is this bit out here. I'm , it's in here. My bad |
|
| 22:06 | in here. Wait a second. , I see. Yeah, I |
|
| 22:12 | know if I'm buying into this. that's interesting. Yeah, because plateaus |
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| 22:17 | here. Yeah. Yeah. I'm sure if I play into that. |
|
| 22:28 | don't think that's right. I think the M0 steps out board here, |
|
| 22:33 | probably over here. You understand what saying? That if this is just |
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| 22:39 | and then founded continental crust and that's well understood then the sea floor spreading |
|
| 22:47 | can't be going, you can't have floor where it's supposed to be |
|
| 22:52 | So I think what happened here is did interpret these lows as a reversal |
|
| 22:57 | in the day when these crimes were a long time ago. I've actually |
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| 23:04 | some work in here and I think we mapped it out board here. |
|
| 23:09 | . So anyways. Okay well let's look at that cross section um through |
|
| 23:17 | things. So this is from late from your paper and they posted |
|
| 23:22 | So um 8.198 point oh one. definitely mojo, right? And then |
|
| 23:31 | have what they called layer two, three. Remember that's upper oceanic |
|
| 23:38 | lower oceanic crust than Emmis mojo. velocity 6.2 to 6.44 point 2 to |
|
| 23:48 | . So these are definitely layer two . Remember they're about on average a |
|
| 23:53 | per second slower than upper continental So you got 4.24 point 36. |
|
| 23:58 | got 5.55 point 89. Those are over continental cross 5.5. Um |
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| 24:09 | So this is the boundary, this the basement crustal boundary because you have |
|
| 24:18 | continents. Well 5.6 is pretty So there may be a structure in |
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| 24:23 | but remember basement velocities for continents ranges about Whenever 5.5, 5.445.5, which |
|
| 24:36 | like 6.3 Okay, so these velocities consistent with the base of the sentiment |
|
| 24:45 | in here. I don't know I they're they're picking velocity ranges but I'm |
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| 24:51 | thinking about velocities in terms of crust these guys, I would pick it |
|
| 25:00 | . I mean, I mean above These velocities 5.585 those are like |
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| 25:08 | velocities But then I would put it to here because 5.7, those are |
|
| 25:16 | little slow for those are a little for Continental sedimentary rocks, but this |
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| 25:24 | 5.4 so maybe I'll put it in and up to like this. |
|
| 25:30 | 5.56, You know, definitely a here now, what about these? |
|
| 25:41 | . that's salt. So this remember this is a salt basin. |
|
| 25:46 | you basically have mantle lower crust, it's layer three or just lower crust |
|
| 25:52 | confidence upper crust which you know, here's the Sao Paulo ridge and all |
|
| 25:59 | this is over the south Paulo plateau the way and then this is bonafide |
|
| 26:04 | crust outboard of here, this is you know, so how this works |
|
| 26:11 | , you know, it's probably the , I wouldn't say it's vertical was |
|
| 26:15 | in here somewhere and then you have on top. So the basin kinda |
|
| 26:20 | really deep here beneath the shelf and you know and then it's the sentiment |
|
| 26:26 | is a little thinner but I mean the Sao Paulo plateau then there's even |
|
| 26:33 | sediments outboard but this is over oceanic . Does all that make sense? |
|
| 26:38 | I just explained? Yes sorry I find my mute button on my had |
|
| 26:49 | makes sense. Good. Good And then and then these numbers up |
|
| 26:55 | 38 through down to 23. Those the numbers for the refraction stations |
|
| 27:02 | Yeah so that I don't really have picture of that but those are the |
|
| 27:06 | for these refraction stations on 31. this reverse pair here? 29 or |
|
| 27:14 | this station 29 28 of these two . 26 is this reverse profile |
|
| 27:20 | So I guess to the reverse 31 29 28 27. So these |
|
| 27:29 | all coincide with that reverse pair of receivers because it's reversed. Then you |
|
| 27:37 | work out these dips that's why they're able they're able to do that. |
|
| 27:41 | like I said this is an old but the data is still good and |
|
| 27:47 | what we're gonna do is we're gonna these these source dumps and their understanding |
|
| 27:55 | least their first order interpretation of this of geometry into R. Two |
|
| 27:59 | Model. Okay but let me explain little bit more deeply about these velocities |
|
| 28:06 | what I'm talking about. So I a lot of time. I mean |
|
| 28:10 | these the two main sources here are and twists for oceanic. I'm |
|
| 28:18 | more twisted christians in the money for white and all for the oceanic. |
|
| 28:25 | then more and twist is just a that I also used to explain |
|
| 28:29 | But so what Christiansen and Mooney They looked at about I think almost |
|
| 28:36 | um refraction stations around the world and . And they came up with a |
|
| 28:42 | , you know, generic continental crystal with their model is three layers of |
|
| 28:50 | crust. Even though I only have hear it doesn't really matter. It's |
|
| 28:54 | depends on what you read. Some three, some have two. And |
|
| 28:59 | um they had two layers of sedimentary their Global model and White and others |
|
| 29:08 | for oceanic crust. There there that is is uh Is a summary of |
|
| 29:17 | other global studies for oceanic crust. so the top panel here, the |
|
| 29:24 | half of these charts is velocities and bottom half is thickness ranges for continental |
|
| 29:32 | and oceanic crust. So upper lower crust is the same as layer |
|
| 29:40 | layer three. Oceanic layer one. is the sediments right? And And |
|
| 29:47 | for thickness we're just, you know total for the oceanic and then just |
|
| 29:51 | two. And then averages for upper lower continental thickness. And then the |
|
| 29:58 | of these values. These ranges are broad. But the takeaway here is |
|
| 30:04 | velocities of layer two are on average a kilometer per second slower than upper |
|
| 30:13 | crust. So diagnostically You would expect see Upper Continental Cross very I |
|
| 30:21 | I think 5.5. Really? I 5.56.3. I mean, experience |
|
| 30:28 | I've looked at thousands of refraction So I mean, experience wise, |
|
| 30:34 | would say 5.5, Maybe 6.3. for ocean layer two, I |
|
| 30:40 | I think 4.65.3 This range is a broad. And but that's the |
|
| 30:49 | So if you have refraction data, good enough. You can and you |
|
| 30:57 | layer velocities in this rage, like they have 4.284.3. That's definitely in |
|
| 31:05 | range Uh of Uh layer two. ? And continents 5.7. So I |
|
| 31:18 | , you know, this is I still think that's I think that's |
|
| 31:23 | . 5.58. I would put it here. Um Yeah, but you |
|
| 31:28 | what I'm looking at when I'm looking these velocities and I'm comparing them to |
|
| 31:33 | to these global summaries. And this just the way I think about those |
|
| 31:36 | . And and of course there's exceptions everything again, this is kind of |
|
| 31:40 | the rule of thumb sort of territory um just looking at velocities, you |
|
| 31:45 | begin to sort of I mean you , kind of like think about these |
|
| 31:50 | and I'm not saying that this is 100% correct but I'm saying that you |
|
| 31:56 | look at these things just like the of thumb that I that I think |
|
| 32:00 | should memorize is that these maybe it memorize this as well because it's it |
|
| 32:07 | you it really helps you in understanding know, the earth and the crustal |
|
| 32:15 | geometries and and you know that so is this is good stuff. And |
|
| 32:22 | So layer two is usually pretty thin , I mean this is the |
|
| 32:26 | right? This is the sheeted, sheeted dykes that are you know that |
|
| 32:31 | interact with the seawater, right? typically pretty thin. So the biggest |
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| 32:38 | of oceanic crust is actually the lower , layer three is actually the thickest |
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| 32:43 | . The continental crust is almost half half. I mean it's the lower |
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| 32:48 | . That's the gap grows in the I mean the granule, it's those |
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| 32:53 | of things, those are typically a bit thicker but not much. So |
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| 32:57 | when I model this I typically model also when for the three layer model |
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| 33:03 | uh Christiansen and Mooney's three layer crystalline . It's just upper crust. And |
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| 33:10 | the lower crust is divided in If you look at the velocities, |
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| 33:16 | see that because, you know, for the for the layer they're they're |
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| 33:24 | . The deepest layer are, you , 7.2 and greater and the upper |
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| 33:31 | is less. So alright, so about that. All right. |
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| 33:36 | let's look at gm sis. when we now I think this is |
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| 33:41 | already done you know, you said set up a project and you've actually |
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| 33:46 | it in the exercise, which is . Okay. And we've already done |
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| 33:53 | and then okay, We haven't launched program yet. But when you launch |
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| 33:57 | , this is what it's gonna look . You know, you're gonna have |
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| 34:00 | gonna have actually a model in But um Right, But this is |
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| 34:05 | drop down. I think it's advanced now or something like that. But |
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| 34:11 | gonna want to run stand alone and show you how to do that. |
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| 34:15 | then we can just minimize the rest montage. We just launched this outside |
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| 34:20 | montage and this is what it's gonna like when you open it up. |
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| 34:25 | is the initial model. And so have you have a plan view. |
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| 34:30 | not gonna use that. So, just close that by grabbing this slide |
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| 34:34 | here and moving it up. I'll you how to do that. And |
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| 34:37 | there's a magnetic panel and a gravity . And as with all the |
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| 34:43 | almost all the other models, we at observed data are dots and in |
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| 34:48 | case they're just so close together it thicker And the calculated is the thin |
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| 34:54 | , this black line, not the one. Um And in this model |
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| 34:59 | red line is the air and I always turn it off. I |
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| 35:03 | care about it. Um I'll explain I don't care about it. And |
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| 35:08 | this is the death panel. So this is your model and it |
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| 35:12 | a bunch of layers with points that these layers um these horizons rather and |
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| 35:20 | some densities and some labels and stuff you can right click basically anywhere in |
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| 35:26 | right click here here and here. can right click on the margins or |
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| 35:30 | top gray panel and there's different you know, for changing like you |
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| 35:36 | , the range you're looking at or units, things like that. |
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| 35:42 | you know, scaling all kinds of . There's a different menu for every |
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| 35:47 | and and for every gray area that see here bounding parts. Okay, |
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| 35:56 | you're gonna you can there's there's a file preferences which has a lot |
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| 36:04 | a lot of cool stuff in You can you can edit the fonts |
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| 36:08 | the model, the anomaly, the , the thickness of the profiles and |
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| 36:13 | cross section, the, you know color of the vertex points or the |
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| 36:19 | the of the of the layer boundaries a lot of different things you can |
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| 36:24 | around with, I think I go that. Right? So if you |
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| 36:27 | fox for example you can change the and the type of fox for all |
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| 36:32 | different elements of the model. You anomalies, you can change the color |
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| 36:38 | all the different parts of the right, Magnetics, gravity, you |
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| 36:45 | change all the gradients, you can that and then cross section. So |
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| 36:51 | is the, you know that you change the plan view depth, all |
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| 36:57 | sort of things, you can customize with different colors and stuff, you |
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| 37:01 | , number of decimals, there's all of things. So the next thing |
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| 37:07 | , so that's the file drop down view will use that one and this |
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| 37:12 | , what would we use this one make like bookmarks of? So so |
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| 37:18 | you have a model, you have displayed and exactly the way you want |
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| 37:22 | everything perfectly labeled and in the right and everything and you want to preserve |
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| 37:30 | . You just come up to view you can add it, you can |
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| 37:33 | save it and that way then next you go open the mind just go |
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| 37:37 | views and the drop and it will this, you just pick, you |
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| 37:41 | , it will add another name here you just pick that and we'll just |
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| 37:44 | right to that. So that's that's handy. So we'll be doing that |
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| 37:51 | for a few times. That is also you can we're not gonna do |
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| 37:59 | but for example that cross section that looked at from laden, you can |
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| 38:05 | stretch that and lay it into the window and just use that if you |
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| 38:10 | to, you would just take pick an image, give it |
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| 38:14 | you know, some dimensions here and we'll just put it right in the |
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| 38:18 | so you can do that. We're going to But yeah, you have |
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| 38:23 | make sure that is also enabled black . So if you if you got |
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| 38:29 | block, the layers are colored, they'll be on top of the |
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| 38:34 | But if you just disable block Phil turn it off, then you'll be |
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| 38:38 | to see the image beneath it. like I said, we're not going |
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| 38:41 | do that, I just show you sort of capability. Yeah, also |
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| 38:47 | the overlay we can we can do change the colors, the color stretch |
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| 38:53 | the limits of the color to enhance And you can you can map the |
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| 39:02 | , map the layers in color based the density of magnetization. And I'm |
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| 39:06 | to ask you to do that for final model. You're gonna send me |
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| 39:10 | versions of the final model, one the magnetic part, one for the |
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| 39:14 | part and for the magnetic I'm gonna you to map it by susceptibility. |
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| 39:18 | gonna want you to map it by . I'll show you, I'm gonna |
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| 39:21 | you every bit of this. I nothing to freak out about. |
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| 39:26 | So yeah, so here is what this? This is now this is |
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| 39:30 | part, I've already done this for . This is how I how I |
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| 39:34 | input the refraction data into the right? And here's the numbers, |
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| 39:42 | those, remember those stations those those those pairs of reverse profiles. 31 |
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| 39:49 | 31 just East station but 29 we the west and east station 28 west |
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| 39:54 | east 27 just east station. And already put these in here. But |
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| 39:58 | you want to examine those you go to overlay wells managed wells and it |
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| 40:04 | show you this window here. And you click on one of these This |
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| 40:08 | 31 each, you click on that it will and say edit then it |
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| 40:13 | bring up this little window and this where you assign it the symbol and |
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| 40:19 | put the name of it, its with respect to you know this isn't |
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| 40:27 | with respect to sea level, um location along the profile. And if |
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| 40:33 | looking at and if it's offline remember if you're looking at something that's offline |
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| 40:38 | can put that value in here and just the horizons this says well horizon |
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| 40:43 | I'm just calling you these are refraction , it's just that, you |
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| 40:47 | so I'm basically, even though this Wells, this is refraction data, |
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| 40:51 | using it the same way you can it for well if you have a |
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| 40:54 | you put this, but I put sorts of things in here. I |
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| 40:57 | like uh, intersection tie intersections with models and I just labeled that and |
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| 41:03 | put in the depth where you different horizons where they should intersect the |
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| 41:07 | thing. So even though it well, it's just basically any kind |
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| 41:12 | control you can put in here, can do that. Okay, so |
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| 41:17 | pretty cool. Like I said, have, I've already done this for |
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| 41:21 | . You can examine the model if like, just click overlay wells managed |
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| 41:26 | and then you'll see, you can on any of these and edit it |
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| 41:29 | figure out what, you know, you did. Okay. And then |
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| 41:35 | um another, so these are all dropdowns that we'll be using in the |
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| 41:41 | . I mean, I'm sorry, the whatever the icons, the |
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| 41:48 | there's another thing that's really important that didn't say it, is that you're |
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| 41:51 | want to save your model awesome. , so right now what your models |
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| 42:01 | . Yeah, so they're a they're a When you open the initial |
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| 42:08 | right? I would say the very thing you want to do because you |
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| 42:13 | to go into the drop down and do this. You want to go |
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| 42:16 | the file menu and save ads and it right away that way, you |
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| 42:22 | have the very initial model and then we go along, you want to |
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| 42:28 | , we'll say the first one is then you want to say C d |
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| 42:33 | blah blah. That's the way I it. And that way it now |
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| 42:36 | can maybe say Ian and underscore then comment on it. But for |
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| 42:41 | I like to make file names, know, like most people, I |
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| 42:45 | that explains something, so abc tells what order it was. And the |
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| 42:53 | is if you mess the model There is an undo but it only |
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| 42:58 | back 10 steps. So, so you if you're modeling along and You |
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| 43:06 | , you've been doing a bunch of , you should probably save your mom |
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| 43:10 | you know, it's kind of I mean it's only gonna go back |
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| 43:14 | times and if you need to go further, you know, that's that's |
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| 43:19 | if you have been saving your model all, you got to go back |
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| 43:21 | the very beginning, so you don't do that either. So you need |
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| 43:23 | save the model, you know, so often, especially at major, |
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| 43:29 | know, so when you finish the modeling, we're going to gravity first |
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| 43:33 | Magnetics. When you finish the you're gonna wanna like save that |
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| 43:37 | Okay, okay, so there's a things here, few of these |
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| 43:42 | we're gonna use move vertex a Probably add vertex and remove vertex. |
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| 43:50 | add remove We're gonna be using these lot. You're gonna use split |
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| 43:55 | You're gonna be using remove horizon. these are opposite operations, right? |
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| 44:01 | can split a split a block or can, you know, take away |
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| 44:06 | horizon. That's in a split box layer is very important. We haven't |
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| 44:11 | show you that more resuming is um never used these. I typically use |
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| 44:17 | . I go from box zoom to . So I saved my views. |
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| 44:23 | ones I like as I go you know, I'm saving model |
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| 44:29 | I'm saving different views which are also in the in the model version. |
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| 44:34 | then I'm zooming into areas I want work on because this zoom is just |
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| 44:39 | , you'll find out if you try and then, you know, this |
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| 44:45 | this mobbing packages like state of the . When you look at literature, |
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| 44:48 | see all kinds of models and you'll this GMC program in them. I |
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| 44:55 | this stuff is just pervasive everywhere. but it's still grab bag and you |
|
| 45:02 | , gravity magnetic exploration. You there's not even a budget and most |
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| 45:07 | because it's it's so small. It's it's incidental, right? It's |
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| 45:12 | you know, coffee, you it's like the coffee fund. Um |
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| 45:17 | not it's like it's just like a . A few percentages if that much |
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| 45:23 | you know, budget. So, that means that even though this is |
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| 45:28 | state of the art software, it's like landmark, right? It's not |
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| 45:35 | Petrus is it's not like any of of those, you know, big |
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| 45:40 | software packages that have lots of bells whistles. So what I'm getting at |
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| 45:46 | is that as you as you move layers and move horizons around the |
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| 45:52 | the labels that tell you what the are or the or what's the name |
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| 45:57 | that layer? Is that you gave ? It is not going to move |
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| 46:01 | with you. You have to periodically this and then go to the model |
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| 46:06 | move all the labels yourself, you snap them. You know, you |
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| 46:11 | just click on the layer and it the label will jump to it. |
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| 46:14 | you gotta do that, man okay horizon, we're gonna use this for |
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| 46:20 | modeling and calculate you do this any . But the model calculates almost with |
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| 46:26 | operation you do. So you may have to do that. Well, |
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| 46:30 | have to do this at your final you send me is a final model |
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| 46:36 | I'll explain that as we go. , so let's look at the let's |
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| 46:42 | at the examined tool. So this the examined tool. Remember the |
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| 46:47 | And when you click. So when click that and when you click on |
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| 46:52 | layer, it will pop this thing , right? So when it's when |
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| 46:56 | examine tools active, you click on layer and the block properties jump up |
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| 47:02 | and this is where you can make model 2.5 D. Or two and |
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| 47:05 | quarters deep. Remember three quarters just you can make a block that's off |
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| 47:10 | right here, you can turn the on or off. If you have |
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| 47:12 | bunch of little tiny blocks or you in your model you can the labels |
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| 47:19 | just clouding everything up. You can turn them off. You can change |
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| 47:23 | color, foreground color or the background . I don't really understand how that |
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| 47:31 | personally. I mean I just changed foreground color, you can change the |
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| 47:37 | and this transparency, this doesn't I don't know how that works. |
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| 47:40 | a few things that are kind of um but you can change the |
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| 47:46 | you just keep the density in for layer that you want. Now you |
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| 47:50 | use the death density table. I've done this, I've never done anything |
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| 47:53 | velocity. I'm not sure if it very well. So we just worry |
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| 47:58 | density. Now if you want this is a C button on both |
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| 48:04 | and gravity. When you click that window pops up and you can see |
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| 48:10 | a slide bar and so you can set the limits of the slide |
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| 48:17 | I mean there's a default, this I think 13 is the default but |
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| 48:20 | can set the limits to give it sensitivity and you can just grab this |
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| 48:24 | and go up and down and it change the model. And this is |
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| 48:28 | manager friendly. I mean this is fun to use in meetings. |
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| 48:34 | And you can do that with Magnetics gravity. Um Yeah, that's everything |
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| 48:39 | this one here. Um Also you click on again the three quarter |
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| 48:49 | But right, and that gives you same window. But now if he |
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| 48:56 | two more tabs, uh X, and X X. Negative, I |
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| 49:03 | X plus X. And this is going away from you in the |
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| 49:11 | away from, you know, away you in the, from the plane |
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| 49:15 | the model and this is coming and mine is coming towards you. And |
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| 49:19 | can set how thick how thick that and and the rock properties in |
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| 49:26 | So that's how you do, we're going to do this, but just |
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| 49:32 | . Y. That's how you can it. Um There's other things that |
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| 49:37 | gonna do, you can do the can click on the horizon, |
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| 49:41 | And when you do that, this up and you can simplify it, |
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| 49:45 | we'll do, I'll show you how do, you can even export these |
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| 49:52 | and then you can click on it a point and you can give it |
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| 49:55 | exact X and Z coordinates if if you have such a, you |
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| 50:00 | , such information, you can put in? Um I think this is |
|
| 50:04 | gets really kind of uh this is , really do, I mean you |
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| 50:08 | be using this modeling for like an study, you know, then you |
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| 50:11 | put in the exact values for your , uh for your versaces, so |
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| 50:17 | , um and then import horizon, we're going to use this for magnetic |
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| 50:23 | and basically you can actually load the that it has a horizon in it |
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| 50:32 | you can modify that. We're going use a pen and pre penned a |
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| 50:36 | . We're just going to create them with the cursor. Alright, so |
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| 50:43 | it for the instruction of the kind like the overview of GM system to |
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| 50:49 | all that was a lot of but um yeah, I think that |
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| 50:56 | we work through the model, you , remember that all the stuff that |
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| 51:00 | gonna use is explained in these Are you ready to start the modeling |
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| 51:10 | ready as I'll ever be? So do we want to take a |
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| 51:14 | break first? Um No, I . I mean if you want |
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| 51:19 | but I'm okay. Yes, can hear me? Yes, I can |
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| 51:30 | hear you. Okay? You're breaking a little bit. Okay, So |
|
| 51:36 | gonna go into G. S. profile, right? And then, |
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| 51:42 | modeling, new model rather, and on that one at the very bottom |
|
| 51:48 | there's a menu item says run GMC stand alone. Do you have |
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| 52:01 | Yes, like that. And then the second you'll get another. Don't |
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| 52:11 | , never click update on these Never click update for anything. |
|
| 52:17 | mine's open. Alright. Yours launch ? Yeah. So then you can |
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| 52:22 | minimize montage and maximize G. C. S. You have |
|
| 52:38 | Yes. All right. Now you go open and it should have one |
|
| 52:49 | in there. Right. Mhm. . What does it have in your |
|
| 53:04 | ? Nothing. It just has like file I created. Yeah. So |
|
| 53:12 | know what happened is your you didn't didn't put your project in your exercise |
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| 53:27 | ? Someone where you know, do know the do you know the path |
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| 53:34 | your exercise folder? No, I have like a lot of random stuff |
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| 53:50 | here now because I'm in a Well, okay, alright then close |
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| 54:00 | out and go back to montage. . Sorry, but I thought I |
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| 54:07 | it. Right, okay, I'm in montage. Alright. Go |
|
| 54:13 | file project close. Okay. Now to file project new. Okay. |
|
| 54:31 | then navigate whoever the exercise folder Where should it be, wherever you |
|
| 54:41 | it to be. Where did you that? Where did you download |
|
| 54:45 | That folder too? I mean you the exercise folder somewhere, right. |
|
| 54:52 | . My my husband did that for . Let me go grab him real |
|
| 55:05 | because he downloaded all of this for . You need to find need to |
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| 55:09 | where you don't need to navigate the one. You have to put it |
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| 55:12 | the exercise folder. I mean that's easiest way to make things work. |
|
| 55:17 | ? So I feel like if I to just put it on my desktop |
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| 55:19 | can put in my desktop. but if that's where you put the |
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| 55:23 | folder. Sure. Okay. Let me give me give me just |
|
| 55:26 | second. Alright let's just come back in 10 minutes, |
|
