川南地区五峰组—龙马溪组深层页岩储层特征和含气性  

Reservoir characteristics and gas content of Wufeng-Longmaxi formations deep shale in southern Sichuan Basin

作　　者：邹晓艳 李贤庆[1,2] 王元 张吉振 赵佩[1,2] ZOU Xiaoyan;LI Xianqing;WANG Yuan;ZHANG Jizhen;ZHAO Pei(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),Beijing 100083,China;College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;CNPC Engineering Technology R&D Company Limited,Beijing 102206,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University),Ministry of Education,College of Resources and Environment,Yangtze University,Wuhan 430100,China)

机构地区：[1]中国矿业大学(北京),煤炭资源与安全开采国家重点实验室,北京100083 [2]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [3]中国石油集团工程技术研究院有限公司,北京102206 [4]长江大学资源与环境学院,油气资源与勘探技术教育部重点实验室,湖北武汉430100

出　　处：《天然气地球科学》2022年第4期654-665,共12页Natural Gas Geoscience

基　　金：国家自然科学基金项目(编号:U1810201);国家重点基础研究计划“973”课题(编号:2012CB214702);国家科技重大专项课题(编号:2016ZX05007-003)联合资助。

摘　　要：页岩储层特征是影响页岩气资源评价的基本因素,页岩储集物性对页岩气赋存具有重要意义。通过井下岩心样品的X射线衍射、场发射扫描电镜、孔隙度等实验分析测试,对川南泸州地区五峰组—龙马溪组深层页岩的储层特征和含气性进行了研究,并对比了长宁地区龙马溪组中浅层页岩。结果表明:川南泸州地区五峰组—龙马溪组深层页岩有机质丰度较高(TOC平均值为3.37%),成熟度处于过成熟阶段(RO值平均为2.24%);储层孔隙度较高(均值为4.45%),发育无机矿物孔、有机质孔等多种类型孔隙;具有高石英含量(平均为44.25%),低黏土含量(平均为29.03%),高脆性矿物含量(平均为57.35%),脆性条件好(脆性指数Ⅰ、Ⅱ均值分别为55.35%和67.44%);页岩储层超压(压力系数>2.0),含气性良好(含气量为4.10~7.90 m3/t),这与长宁地区龙马溪组中浅层页岩存在差异。总体而言,川南泸州地区五峰组—龙马溪组深层页岩具有良好的储集性能,有利于深层页岩气的赋存富集。Shale reservoir characteristics are the fundamental factors affecting shale gas resource evaluation,and shale reservoir properties are of great significance to shale gas occurrence.Through X-Ray diffraction,field emission scanning electron microscopy,porosity and other experimental analysis of downhole core samples,the reservoir characteristics and gas content of deep shale in Wufeng-Longmaxi formations in Luzhou area of southern Sichuan Basin are studied,and the shallow shale in Longmaxi Formation in Changning area is compared.The results show that total organic carbon(TOC)content of Wufeng-Longmaxi formations deep shale in Luzhou area of southern Sichuan Basin is high(average,3.37%),maturity is in the over-mature stage(average,2.24%).Reservoir porosity is relatively high(average,4.45%),and various types of pores such as inorganic mineral pores and organic matter pores are developed.In the mineral composition of the shale reservoirs,quartz content is relatively high(average,44.25%),low clay content(average,29.03%),high brittle mineral content(average,57.35%),and good brittleness conditions(average brittleness indexes I and II are 55.35%and 67.44%,respectively).The shale reservoir is overpressure(pressure coefficient>2.0)and gas-bearing capacity is good(gas content is 4.10-7.90 m3/t),which is different from the shallow shale of Longmaxi Formation in Changning area.Overall,the deep shale of Wufeng-Longmaxi formations in Luzhou area has good reservoir properties,which is beneficial to the occurrence and enrichment of deep shale gas.

关 键 词：深层页岩 储层特征 含气性 五峰组—龙马溪组 孔隙类型 页岩气 川南地区 

分 类 号：TE122.1[石油与天然气工程—油气勘探]