Accurate and Effective Simulation for Reservoirs of Complex Geological Features

摘要

Heterogeneous geological features, such as fractures, faults,rnshale laminae, and cross-stratified beds, can exert significantrneffects on the flow performance. Accurate simulation of theserncomplexities requires two model functions, i.e. abilities tornaccurately compute both pressure and velocity and tornefficiently handle permeability tensor. In this paper, a fluxrncontinuous model incorporating full tensor permeability wasrndeveloped for two-phase flow of immiscible andrnincompressible fluids. Flow systems were split into twornsubsystems of configurations, one for elliptic equation ofrnglobal pressure and the other for parabolic equation ofrnsaturation, and solve both sequentially by means of the mixedrnfinite volume element (MFVE) method.rnNumerical examples of simulating flow in sand-shalernsystem and fractured reservoirs are presented to prove therneffectiveness and robustness of the model demonstratingrnparticular suitability for handling high heterogeneities andrnaccurately resolving steep pressure gradients. The MFVErnmethod can accurately calculate the flow variables, andrngenerate more realistic streamlines than the standard finiterndifference method for a discontinuous permeability field.rnApplications to naturally fractured reservoirs validate the usernof full-tensor effective permeability for accurate and effectivernsimulation.