顺北油田断溶体油藏孔隙压缩系数理论模型

doi:10.7657/XJPG20210210

摘要/Abstract

摘要：

孔隙压缩系数是计算油藏动态储量和弹性能量的重要参数,但断溶体油藏的储集空间复杂,孔隙压缩系数难以通过岩心实验获得,为此,以顺北油田为例,从连续介质和离散介质充填2个角度推导了裂缝的孔隙压缩系数模型,基于孔隙度加权方法,建立了断溶体油藏孔隙压缩系数模型。研究结果表明,裂缝介质的孔隙压缩系数与裂缝的面孔隙度、裂缝充填物的杨氏模量和泊松比有关,裂缝面孔隙度和充填物泊松比越大,裂缝的孔隙压缩系数越大;断溶体储集层的孔隙压缩系数介于溶洞孔隙压缩系数和裂缝孔隙压缩系数之间,更接近于溶洞孔隙压缩系数;采用常规方法计算断溶体油藏孔隙压缩系数,会低估油藏的动态储量。

关键词: 顺北油田, 断溶体, 裂缝-溶洞介质, 离散裂缝, 裂缝面孔率, 孔隙压缩系数, 动态储量

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

中图分类号:

TE346

李冬梅, 李会会, 朱苏阳, 李传亮. 顺北油田断溶体油藏孔隙压缩系数理论模型[J]. 新疆石油地质, 2021, 42(2): 194-200.

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.

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