DOCUMENTATION FOR PROGRAM OGRE

Abstract

This is a brief description of a computer program which was written by Oleh Weres to generate discrete grids for IFD* type computer programs. The output of the program includes data which can be used directly for input to the program SHAFT78. The program is specifically intended for large-scale two or three-dimensional reservoir simulation. The program requires, as input, the x, y, z coordinates of the discrete element locations being used to specify a particular reservoir's geological system. From the list of element locations, the program finds the midpoints of lines joining adjacent elements. At each midpoint the program constructs a perpendicular plane. The intersections of the planes in the three-space defines an irregular (in general) n-sided polyhedron around each element center. In two-dimensions the program produces a unique 'tiling' which has polygons with all faces perpendicular to the lines joining adjacent elements. The areas between adjoining elements and the volume of each element are calculated. The end result, in general, is a three-dimensional grid of n-sided polyhedra for which the element locations, the connecting (flow) areas, and the element volumes are all known. Since the grids are finite the program must have information about the boundary of the grid.more » This is supplied as a set of 'dummy' elements which are used only to limit the extent of the grid and are not intended for use in the reservoir simulation. « less

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