基于叠加数字岩心和孔隙网络模型的页岩基质储层孔隙空间表征方法  

Pore space characterization method of shale matrix formation based on superposed digital rock and pore-network model

作　　者：杨永飞[1] 刘志辉 姚军[2] 王晨晨 孙海[1] 张磊[1] 刘磊 赵建林[1] 安森友 张文杰 刘鹏飞 YANG YongFei;LIU ZhiHui;YAO Jun;WANG ChenChen;SUN Hai;ZHANG Lei;LIU Lei;ZHAO JianLin;AN SenYou;ZHANG WenJie;LIU PengFei(School of Petroleum Engineering, China University of Petroleum （East China）, Qingdao 266580, China;Research Center ofOil ＆ Gas Flow in Reservoir, China University of Petroleum （East China）, Qingdao 266580, China;Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan 430100, China)

机构地区：[1]中国石油大学(华东)石油工程学院,青岛266580 [2]中国石油大学(华东)油气渗流研究中心,青岛266580 [3]长江大学非常规油气湖北省协同创新中心,武汉430100

出　　处：《中国科学：技术科学》2018年第5期488-498,共11页Scientia Sinica(Technologica)

基　　金：国家自然科学基金项目(批准号:51711530131;51674280;51490654;51704033);青岛市自主创新计划应用基础研究项目(编号:16-5-1-38-jch);中央高校基本科研业务费专项基金项目(编号:17CX05003);国家科技重大专项(编号:2016ZX05010002005;2016ZX0504004007);长江学者和创新团队发展计划项目(编号:IRT_16R69);高等学校学科创新引智计划项目(编号:B08028)资助

摘　　要：针对页岩样品基岩既包含无机孔隙,又包含有机孔隙的特点,本文建立了能同时描述两类孔隙的数字岩心和孔隙网络模型.首先基于模拟退火法和马尔可夫链蒙特卡罗法分别构建了无机孔隙数字岩心和有机孔隙数字岩心,然后按照一定算法叠加两个数字岩心,重构出了既包含无机孔隙信息又包含有机孔隙信息的叠加数字岩心;对构建的表征不同孔隙类型的数字岩心,分别提取其孔隙网络模型,按照二者之间的连接信息,将两个孔隙网络模型整合到一起,建立了既包含无机孔隙信息又包含有机孔隙信息的双孔隙网络模型;最后基于两大平台,分析了页岩样品的几何拓扑结构性质,孔隙半径分布和配位数与实验结果拟合程度较好,验证了构建方法和数值分析方法的正确性.Aiming at the characteristics that both the organic and inorganic pores are existing in the shale matrix, digital core and pore network model which could describe these two kinds of pores at the same time are constructed in this paper. Firstly, the inorganic pore digital core and organic pore digital core are constructed based on simulated annealing method and Markov Chain Monte Carlo method.Secondly, the two digital cores are superposed together according to certain algorithms, which includes the shale organic and inorganic pores information. Meanwhile, pore network models of these two digital cores are extracted respectively. And they are integrated into one pore network model, which could represent the dual pore information. Finally, based on these two platforms, the geometry topology structure properties, pore radius distribution and coordination number of a shale sample are analyzed. The simulated results match well with the experimental results, which verify the correctness of the construction method and numerical analysis methods.

关 键 词：页岩 叠加数字岩心 整合孔隙网络模型 模拟退火法 马尔可夫链蒙特卡罗法 

分 类 号：TE311[石油与天然气工程—油气田开发工程]