A review and research on comprehensive characterization of microscopic shale gas reservoir space

作者：Yu-ru Yang,Xiao-chen Liu,Hui Zhang,Gang-yi Zhai,Jiao-dong Zhang,Zhi-fang Hu,Shu-jing Bao,Cong Zhang,Xiang-hua Wang,Xiao Yang,Zheng-zhuang Liu,Ting Xie,Juan Chen,Liyu Fang,Li-juan Qin

摘要：In this paper,substantial domestic and foreign research results of microscopic shale reservoir space were systemically reviewed,the research history consisting of simple observation and qualitative classification,quantitative research,the combination of qualitative and quantitative research successively as well as the characteristics of each research stage were summarized.In addition,the current problems existing in the characterization methods of shale reservoir space were also analyzed.Furthermore,based on massive actual detection of typical core samples obtained from more than 50 global shale gas wells and relevant practical experience,a comprehensive characterization method of combining qualitative with the semiquantitative characterization was put forward.In detail,the indicators of the qualitative characterization include pore combination type and organic-matter microscopic morphology type,while the core elements of the semi-quantitative characterization include the percentage of the organic-matter area and the plane porosity of the pores of different types.Based on the reference of the naming and classification of rocks,the three-end-member diagram method was used to characterize microscopic shale reservoir space.This is achieved by plotting the three end-member diagram of 3 kinds of first-order critical reservoir spaces,i.e.,organic-matter pores,matrix pores,and micro-fractures,in order to intuitively present the features of the microscopic pore combination.Meanwhile,statistic histograms of organic-matter microscopic morphology type and the plane porosity of different types of pores were adopted to characterize the development degree of second-order pores quantitatively.By this comprehensive characterization method,the importance of both pore combination and the microscopic morphology of organic matter were emphasized,revealing the control of organic-matter microscopic morphology over the organic-matter pores.What is more,high-resolution FE-SEM was adopted to obtain semi-quantitative statistics results.In

发文机构：Oil and Gas Survey Unconventional Petroleum Geology Laboratory of Oil and Gas Survey SGS-CSTC Standards Technical Services Co. School of Energy Resources

关键词：SHALESHALEgasReservoirspaceRESEARCHstatusTypesofPORECOMBINATIONSOil-gasexplorationengineeringLongmaxiFORMATIONNiutitangFORMATIONShahejieFORMATIONYanchangFORMATIONChinaUSA

分类号： P61[天文地球—矿床学][天文地球—地质学]