川南威荣地区五峰组—龙马溪组深层页岩气微观储集空间发育特征及意义  

Micro reservoir space characteristics and significance of deep shale gas in Wufeng-Longmaxi formations in Weirong area,South Sichuan

作　　者：熊亮[1] 杨振恒[2,3,4,5] 申宝剑 卢龙飞[2,3,4,5] 魏力民 王濡岳[6] 庞河清 XIONG Liang;YANG Zhenheng;SHEN Baojian;LU Longfei;WEI Limin;WANG Ruyue;PANG Heqing(Research Institute of Exploration and Development,SINOPEC Southwest China Oil and Gas Company,Chengdu 610041,China;Wuxi Research Institute of Petroleum Geology,RIPEP,SINOPEC,Wuxi 214126,China;SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms,Wuxi 214126,China;State Key Laboratory of Shale Oil and Gas Accumulation Mechanism and Effective Development,Wuxi 214126,China;The State Energy Research and Development Center of Shale Oil,Wuxi 214126,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China)

机构地区：[1]中国石化西南油气分公司勘探开发研究院,四川成都610041 [2]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126 [3]中国石化油气成藏重点实验室,江苏无锡214126 [4]页岩油气富集机理与有效开发国家重点实验室,江苏无锡214126 [5]国家能源页岩油研发中心,江苏无锡214126 [6]中国石油化工股份有限公司石油勘探开发研究院,北京100083

出　　处：《天然气地球科学》2022年第6期860-872,共13页Natural Gas Geoscience

基　　金：国家科技重大专项(编号:2015ZX05061001);国家自然科学基金重大项目(编号:41690133);国家自然科学基金重点项目(编号:U1663202);中国石化科技部攻关项目(编号:P21042-1)联合资助。

摘　　要：以川南威荣地区五峰组—龙马溪组典型取心井W井为研究对象,基于岩心观察、薄片、氩离子抛光扫描电镜、X射线衍射、有机地球化学、物性与孔隙结构等分析测试,探讨研究区页岩储层发育特征及其意义。研究表明:①威荣地区五峰组—龙马溪组页岩以灰质富硅炭质页岩、含钙硅质页岩和含钙富硅炭质页岩为主,有机质类型为I型,处于过成熟阶段,黑色页岩以中—高有机碳含量为主,黏土矿物含量平均为40.0%,石英平均为34.7%,碳酸盐矿物平均为18.2%,碳酸盐矿物含量相对较高。②研究区五峰组—龙马溪组页岩主要发育有机孔、黏土矿物层间孔(缝)、黄铁矿晶间孔、长石蚀变孔(缝)和颗粒边缘缝(孔)等储集空间。③五峰组—龙马溪组微孔平均值为0.00973 mL/g,介孔平均为0.01800 mL/g,宏孔平均为0.00377 mL/g,储集空间主要以微孔和介孔为主,有机质同时是微孔、介孔和比表面积的主要贡献者,石英矿物是宏孔的主要贡献者;微孔与介孔协同发育,二者是比表面积的主要贡献者,宏孔与微孔和介孔在发育物质基础上并不相同,宏孔对比表面积的贡献有限。④自上而下,有机孔及占比逐渐增大,在五峰组—龙马溪组底部,有机孔占比可达76.73%,平均约为55.73%。在取样段的上部,无机孔较为发育,无机孔占比平均约80%以上,有机孔主要贡献者是有机质,无机孔的主要贡献者是黏土矿物。⑤川南五峰组—龙马溪组深层高温高压条件下,能够发育高孔高渗优质页岩储层,碳酸盐矿物对页岩储集空间的贡献有限,厚层富有机质页岩仍将是页岩气甜点评价的关键。Taking Well W,a typical coring well of Wufeng-Longmaxi formations in Weirong area,south Sichuan as the research object,based on core observation,thin section,argon ion polishing,scanning electron microscope,X-diffraction,organic geochemistry,tight physical properties and pore structure,the development characteristics and controlling factors of shale reservoir in the study area are discussed.The research shows that:(1)The shale of Wufeng-Longmaxi formations in Weirong area is mainly calcareous silicon rich carbonaceous shale,calciferous siliceous shale and calcium containing silicon rich carbonaceous shale.The organic matter type is type I,which is in the over mature stage.The black shale is characterized by medium to high organic carbon content,with an average clay mineral content of 40.0%,an average quartz content of 34.7% and an average carbonate mineral content of 18.2%.The mineral content of carbonate rock is relatively high.(2)The shale of Wufeng-Longmaxi formations in the study area is generally a low porosity and low permeability reservoir,mainly developing organic pores,interlayer pores(fractures)of clay minerals,inter-granular pores of pyrite,feldspar alteration pores(fractures)and grain edge fractures(pore)equal reservoir space.(3)The average value of micropores in Wufeng-Longmaxi formations is 0.00973 mL/g,the average value of mesopores is 0.01800 mL/g,and the average value of macropores is 0.00377 mL/g.The reservoir space is mainly composed of micropores and mesopores.Organic matter is the main contributor to micropores,mesopores and specific surface area,and quartz minerals are the main contributor to macropores.Micropores and mesopores develop together,and they are specific surface area.Macropores are different from micropores and mesopores on the basis of development materials,and the contribution of macropore to relative surface area is limited.(4)From top to bottom,the proportion of organic pores increases gradually.At the bottom of Wufeng-Longmaxi formations,the proportion of organic pores can r

关 键 词：储集空间 孔隙结构 页岩气 龙马溪组 川南 

分 类 号：TE122.23[石油与天然气工程—油气勘探]