Modelling method for fluids in a fractured environment which is traversed by large fractures

摘要

Simulating fluid flow in a subterranean reservoir comprises modelling a network of volume elements. Each element includes a fissure and matrix and the fluid flow between them is determined. The reservoir includes a network of fluid conductors having a known geometry but which are not homogeneous at the scale of the volume elements. The overall transmissivity of each conductor is determined from the transmissivity of the conductor within each of the elements it crosses. When the reservoir is in very permeable sedimentary rock, the transmissivity value depends on the size of each element and its contact area with adjacent elements. The transmissivity of each fissure depends on the size of the element, the thickness of the fissure and its intrinsic permeability. The reservoir may be simulated by a transform comprising a network of uniform blocks separated by a network of regular fissures.