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Geology Research Unit@TUC

Stratigraphy model with faults

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Hi George,

RockWorks offers very basic support of faults - provided that you can define one or more fault polylines, it will grid either side of the polyline independently, for the current surface. This works reasonably well for surfaces where you have a lot of control points on either side of the fault line. It can be iffy when you don't, since you can't specify an offset or fault angle. In the case of a stratigraphy model created with the Stratigraphy / Model program, it will assume the fault(s) carry downward vertically.

For inclined faults, you would need to be able to define the fault location(s) for each stratigraphic surface and grid them individually, and then build the stratigraphy model manually in the RockWorks Utilities. (Grid / Grids -> Stratigraphy Model) As above, this brute-force method may work reasonably well when you have good control on either side of the fault, and assuming you can define those fault polylines.

Bottom line, you may need to look at more expensive software programs for advanced fault modeling. Feel free to email me directly if you have data-specific questions.

Molly

RockWare Inc.

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What about a fault with a varying amount of displacement ? For example a relay ramp . In my area of Texas there are a lot of en echelon faults. Vertical displacement along any individual fault starts small and builds towards a area with the maximum displacement and then dies out futher along the trend. Often there are relay ramps where the faults come close to meeting where small cross faults even out the displacement

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If you take the approach that Molly has suggested, you would not be taking offset into account. You would just be estimating the XY locations for the interect of the faults with the different stratigraphic layers. The RockWorks gridding algorithm would then take those locations into account during grid interpolation.

If you want to specify offset amount and direction, you would need to look into more advanced modeling programs.

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