Method for analyzing remaining oil distribution of fractured-vuggy reservoir

Abstract

The invention provides a method for analyzing remaining oil distribution of a fractured-vuggy reservoir, belonging to the fields of numerical reservoir simulation and oil-gas field development. In the method, a complex medium consisting of a cave medium, a crack medium and a pore medium is partitioned into a plurality of space unit blocks in a space field; each block consists of V, F and M units which represent a cave, a crack and a substrate in the block respectively and constitute a V-F-M model; the flow of a multi-phase fluid in the complex medium is described by the motion of a fluid among the units in each block and the motion of a fluid among the units of different blocks; and the flow of the fluid among the units can be considered as infiltration flow, pipe flow or laminar flow between parallel walls, Darcy flow or non-Darcy flow. According to the method, scientific description and accurate numerical simulation of the fractured-vuggy reservoir are realized, and technical foundations are laid for the alignment of the remaining oil distribution position of the fractured-vuggy reservoir with a numerical simulation technology, quantitative determination of the reserves abundance of the reservoir, scientific and reasonable development of oil fields provided with the reservoir and final increase in the recovery ratio.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to the research field of fracture-cavity oil reservoirs. Specifically, it relates to a method for analyzing the distribution of remaining oil in a fractured-vuggy reservoir. Background technique [0002] Since the 1960s, Barenblatt et al. have made great progress in the numerical simulation of fractured reservoirs. For the dual medium theory based on pores and fractures, Warren and Root proposed the Warren-Root model composed of orthogonal fracture networks to divide the bedrock in 1963, Kazemi proposed the Kazemi model composed of horizontal fractures and horizontal bedrock layers in 1969, and Pruess in 1985 and Narasimhan proposed the MINC model by finely dividing matrix blocks to describe the pressure gradient between fractures and matrix. The dual-media model is a commonly used reservoir numerical simulation method at present. This medium is composed of rock blocks...

AI Technical Summary

Problems solved by technology

Although some triple-pore or triple-media models have been proposed [Closemann, 1975; Abdassah and Ershaghis, 1986; Bai et al.1993], none of them can be well applied to the complex media of carbonate fracture-cavity reservoirs. Complex flows of multiphase fluids in

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