低渗砂岩油藏多孔介质特性  

Properties on Porous Media in Low Permeability Sandstone Reservoir

作　　者：杨雪 刘建仪[1] YANG Xue;LIU Jian-yi(State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500

出　　处：《科学技术与工程》2023年第30期12911-12916,共6页Science Technology and Engineering

基　　金：国家科技重大专项(21143011)。

摘　　要：以中国石化中原油田W区块低渗砂岩油藏为例,针对目前该区块开发效果逐渐变差,气驱开采发生气窜等问题,以室内实验为基础,结合油层物理、分形理论、渗流机理,利用计算机分形分析软件Frac Lab和Frac Lac分析该区块多孔介质的岩石表面粗糙度、孔隙分布均匀程度和均质性,基于Gaussian分布、Fourier分析工具、幂律定律和最小二乘回归分析等数学基础理论计算出该区块多孔介质的分维数。结果表明:W区块低渗砂岩油藏多孔介质具有分形特征,分维数约为2.58,壁面较粗糙,孔隙内结构复杂,微小孔隙较多,不规则非均质性严重,流动阻力大,且Frac Lab和Frac Lac软件得到的分维数具有较好的一致性。研究结果为低渗砂岩油藏提高采收率、油气渗流规律和多孔介质输运性质的研究提供基础研究支撑,具有重要的现实意义。The low permeability sandstone reservoir has poor development effect and serious gas channeling in the block W of Zhongyuan oilfield,Sinopec.In order to investigate the influence of rock surface roughness,pore distribution uniformity and homogeneity on porous media of the reservoir.Based on the theory of petro physics,fractal and seepage mechanics,laboratory experiments were carried out.Box dimensions of porous media were calculated by Frac Lab and Frac Lac software respectively,based on Gaussian distribution,Fourier analysis,power law and least square regression.The results show that the porous media of block W reservoir is of fractal characteristics,fractal dimension is about 2.58,coarse porous media surface,complex pore structure,more micro pores,serious irregular heterogeneity and high flow resistance.The fractal dimensions obtained by Frac Lab and Frac Lac software have good consistency.The results provide strong basic support for enhancing oil recovery,oil and gas seepage law and porous transport properties,in a low permeability sandstone reservoir has excellent practical significance.

关 键 词：多孔介质 盒维数 分形理论 渗流 低渗砂岩油藏 

分 类 号：TE348[石油与天然气工程—油气田开发工程]