Download 3D Geoscience Modeling: Computer Techniques for Geological by Simon W. Houlding MSc (Eng.), P.Eng. (auth.) PDF

By Simon W. Houlding MSc (Eng.), P.Eng. (auth.)

This publication is as a result a profession spent constructing and utilizing laptop suggestions for the geosciences. the necessity for a geoscience modeling reference grew to become obvious in the course of participation in different workshops and meetings at the topic within the final 3 years. For organizing those, and for the full of life discussions that ensued and unavoidably contributed to the contents, I thank Keith Turner, Brian Kelk, George Pflug and Johnathan Raper. the whole variety of colleagues who contributed in quite a few methods over the previous years to the techniques and methods offered is past count number. The booklet is devoted to them all. Compilation of the booklet might were very unlikely with no the aid of a couple of colleagues who contributed without delay. particularly, Ed Rychkun, Joe Ringwald, Dave Elliott, Tom Fisher and Richard Saccany reviewed elements of the textual content and contributed important remark. Mohan Srivastava reviewed and contributed to a few of the geostatistical shows. Mark Stoakes, Peter Dettlaff and Simon Wigzell assisted with computing device processing of the various software examples. Anar Khanji and Randal Crombe assisted in instruction of the textual content and machine photos. Klaus Lamers assisted with printing. the U.S. Geological Survey, the British Columbia Ministry of setting, Dave Elliott and others supplied info for the applying examples. My honest due to all of them.

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Extra resources for 3D Geoscience Modeling: Computer Techniques for Geological Characterization

Example text

The locators include the coordinates of the grid origin and its rotations. The grid geometry is implicitly defined by the regular grid-cell dimensions and the numbers of grid cells in orthogonal directions. The primary information content is comprised of a predicted variable value at the centroid of each grid cell, together with a measure of its uncertainty. The 3D grid data structure provides us with an appropriate vehicle for representation of raster-like information. It is compatible with all variable prediction techniques and represents a continuous spatial measure of a variable at whatever density of information is appropriate.

It allows us to perform interactive interpretation, initially on 2D geological sections, and subsequently in the third dimension. It also lends itself to rapid generation of simple geological models from surface information, using a simple triangulated form of component geometry. We can readily obtain geological sections at any orientation through the resulting geological model. We can spatially integrate the geological model with the 3D grid data structure described below to achieve the necessary degree of control over the variable prediction process, and we can perform a variety of precise volumetric analyses.

The gridded surface approaches used by the energy sectors to represent geological structure and stratigraphy work well for relatively simple formations. They essentially require that geology be representable by continuous surfaces, whether these are subsequently translated into volumes or not. This creates difficulties, which are not insurmountable, and approximations in. accounting for fault discontinuities or discontinuous (pinched-out) geological units. However, the difficulties of representing overfolded or thrusted or steeply dipping (near-vertical) structures are virtually insurmountable.

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