Hello Essam, I’m not sure if this answers your question completely, but if you are simply wanting to run a lateral density inversion on a layer in GM-SYS 3D, you should be able to do the following:
1. Select the model layer that you want to invert upon for lateral density 2. Go to the Layer Properties tab; in the Density section there is a “Type” drop down, set this to “Lateral Density” 3. The following dialog will appear: [cid:[email protected]] Specifying a Constant here will create a lateral density grid of a constant density; lateral density inversion will now be enabled for this layer. If you are however wanting to obtain an estimate of lateral density variation to begin the inversion with, then other approaches, such as the one Ed suggests below, are valid. If you were to adopt Ed’s approach, I would add that you could use the “Add to 3D>>Grids>>Extract horizontal slices from a voxel” option within Geosoft 3D viewer to extract a density grid that mirrors your GM-SYS model layer geometry, by use of the “Reference surface” (see below); simply export your model layer from GM-SYS 3D as a relief grid, then use this as the input reference surface below, set the start offset and offset increment to zero and the number of grids to 1. This should give you a starting lateral density grid for inversion. [cid:[email protected]] You could also use the grid editing tools within the “GM-SYS 3D Tools” menu to create a starting density variation. There is a GM-SYS 3D How-to-Guide called “Interactively editing grids” available in My Geosoft that describes this process: http://updates.geosoft.com/downloads/files/how-to-guides/GM-SYS_3D_Grid_Edit.pdf I hope this helps, please let me know if you have any further questions. Best regards, Darren Andrews Technical Analyst | Geosoft geosoft.com<http://www.geosoft.com/> | blog<http://blogs.geosoft.com/> | twitter<http://twitter.com/geosoft> | linkedIn<http://www.linkedin.com/company/geosoft-inc.> | facebook<http://www.facebook.com/GeosoftInc> | T +1 416.369.0111 #353 | M +1 647.272.7188 85% of respondents rank data management as a critical or a top five issue for their exploration group. Download the 2015 Exploration Information Management Survey Report<http://www.geosoft.com/exploration-information-management-survey-2015> From: edcunion <[email protected]> [mailto:[email protected]] Sent: Tuesday, March 29, 2016 1:02 PM To: Geosoft Oasis montaj and Target <[email protected]> Subject: Re: [geonet] How I can estimate Lateral Density distribution Hi aboud Just an alternate idea here that might either steer you toward or away from what you are trying to do, Have tried inverting the gravity data to density using voxi and then slicing the voxel into density sections for section displays? Y'oud get lateral modeled density estimates that way. Ed Sent from my T-Mobile 4G LTE device ------ Original message------ From: Aboud Date: Tue, 3/29/2016 2:30 AM To: Geosoft Oasis montaj and Target; Subject:[geonet] How I can estimate Lateral Density distribution Dear all In GMSYS 3D, If I Have gravity survey and topo layer, and I would like to estimate the lateral density distribution grid in order to be used for calculating Lateral density Inversion. I guess I have to use the observed gravity and estimate the apparent density (e.g. magmap) and the output will be the Lateral Density Distribution grid, am I right? Regards Essam -----Original Message----- From: Gerry Connard [mailto:[email protected]] Sent: Thursday, March 24, 2016 10:20 PM To: Geosoft Oasis montaj and Target Subject: RE: [geonet] Published paper using GMSYS 3D inverion Essam, One of the magnetic inversion routines uses the algorithm described by Parker, R.L., and Huestis, S.P., 1974, The Inversion of Magnetic Anomalies in the Presence of Topography, Journal of Geophysical Research, V. 79, # 11, p 1587 The joint inversion uses the algorithm described by Jorgensen, G. and Kisabeth, J., 2000, Joint 3-D inversion of gravity, magnetic and tensor gravity fields for imaging salt formations in the deepwater Gulf of Mexico: 70th Ann. Internat. Mtg.: SEG, pp. 424-426. Regards, Gerry Connard -----Original Message----- From: author.nameemail [mailto:[email protected]] Sent: Thursday, March 24, 2016 12:33 AM To: Geosoft Oasis montaj and Target Subject: [geonet] Published paper using GMSYS 3D inverion Dear all,, I am looking for scientific articles used GMSYS 3D in gravity or magnetic data. If there is some mathematical/algorithms explaining the concept of GMSYS 3D inversion, will be highly appreciated. regards Essam --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?forum=geonet You are currently subscribed to geonet as: [email protected]<mailto:[email protected]>. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community/forums/register/ --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?forum=geonet You are currently subscribed to geonet as: [email protected]<mailto:[email protected]>. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community/forums/register/ --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?forum=geonet You are currently subscribed to geonet as: [email protected]<mailto:[email protected]>. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community/forums/register/ --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?forum=geonet<http://lyris.geosoft.com/read/?fourm=geonet> You are currently subscribed to geonet as: [email protected]<mailto:[email protected]>. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community/forums/register/ --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?forum=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community/forums/register/
