GENERATING UNCONSTRAINED VORONOI GRIDS IN A DOMAIN CONTAINING COMPLEX INTERNAL BOUNDARIES

摘要

Unstructured grids are automatically constructed in a domain containing complex internal boundaries. Simulation grids are constructed for reservoirs or fields which contain complex fault planes. Reconciling among generated fault grid-points and other reservoir/field grid-points is performed, enabling the use of unconstrained Delaunay triangulation. High-quality orthogonal unstructured grids are provided with good convergence properties for reservoir simulation.

主权项

1. A computer implemented method of generating an unstructured grid of a model of a subsurface reservoir based on input data defining internal boundary geometry descriptions of the reservoir model, the method comprising the computer implemented steps of:
(a) refining the internal boundary geometry data to produce a partial set of geometry data points to represent the internal boundary geometry by taking into account the near internal boundary grid spacing requirement; (b) building lines by connecting adjacent geometry data points from the step above to form internal boundary line segments; (c) constructing internal boundary intersected circles at each of the geometry data points; (d) generating internal boundary grid points between intersections of internal boundary intersected circles of adjacent geometry data points; (e) prioritizing the generated internal boundary grid points; (f) generating unconstrained Delaunay triangulation with the internal boundary grid points being triangle vertices; (g) generating Voronoi cells to form unstructured gridding data with Voronoi cell edges honoring prescribed internal boundary line segments; and (h) outputting the unconstrained gridding data.