Theoretical Model of Pore Compressibility for Fault-Karst Reservoirs in Shunbei Oilfield

doi:10.7657/XJPG20210210

Abstract

Abstract:

Pore compressibility is an important parameter for calculating dynamic reserves and elastic energy of oil reservoirs. For fault-karst reservoirs with complex reservoir spaces, it is difficult to estimate the pore compressibility through core experiments. Taking Shunbei oilfield as a case, we derived a compressibility model of fractures from the perspectives of filled continuous media and filled discrete media, and finally established a pore compressibility model of the fault-karst reservoirs through porosity weighting. The research results show that the pore compressibility of fractured media is related to the surface porosity of the fracture, and the Young’s modulus and Poisson’s ratio of the fracture fillings. The larger the surface porosity and Poisson’s ratio, the greater the fracture’s pore compressibility. The pore compressibility of fault-karst reservoirs falls in between the compressibility of the karst caves and that of the fractures, and is closer to the compressibility of the karst caves. The pore compressibility of fault-karst reservoirs calculated with conventional methods underestimates the dynamic reserves of the reservoir.

Key words: Shunbei oilfield, fault-karst reservoir, fracture-cave media, discrete fracture, fracture surface porosity, pore compressibility, dynamic reserves

CLC Number:

TE346

LI Dongmei, LI Huihui, ZHU Suyang, LI Chuanliang. Theoretical Model of Pore Compressibility for Fault-Karst Reservoirs in Shunbei Oilfield[J]. Xinjiang Petroleum Geology, 2021, 42(2): 194-200.

Figures/Tables 9

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