摘要
综合Ys1井的钻井、录井、测井、岩心岩屑鉴定、储层分析等资料,分析探讨了该井峨眉山玄武岩岩石学特征及储层特征。研究表明:Ys1井中揭示的峨眉山玄武岩类型以火山熔岩为主、火山碎屑熔岩和火山碎屑岩次之,少量的玄武玢岩,玄武岩厚258 m;岩性组合表明火山岩相主要发育溢流相,也见喷溢相、爆发相及次火山岩相,纵向上构成14个岩相,归并为3个喷发旋回;火山岩储层具中高孔低渗性,储集空间按成因分为火山岩原生孔缝(气孔、残余气孔、原生收缩缝隙)和次生孔缝(晶内溶蚀孔、基质溶蚀孔、次生矿物溶孔、微溶孔、杏仁体溶孔、构造裂隙、残余构造裂隙、风化淋滤孔缝)两类;该套储层经历了火山冷凝作用、火山热液作用、表生作用、埋藏作用等多个成岩阶段,总体上表现为各个成岩阶段流体的进入使原生孔—洞—缝充填储集空间减少;由此认为火山岩储层主控因素为岩性、岩相、次生溶蚀-充填作用。Ys1井位于四川盆地西部地腹,油气显示良好,初步展现了四川盆地西部峨眉山玄武岩储层勘探新领域,拓展了峨眉山玄武岩在四川盆地西部地腹分布范围。
The lithological and reservoir characteristics of Emeishan basalt are discussed and analyzed based on the copmprehensive analyses of drilling,logging,well logging,core identification and reservoir character in wildcat well Ys1 in western Sichuan Basin.Drilling of well Ys1 reveals that the basalt has a thickness of 258 meters,which is composed of volcanic lava,pyroclastic lava,pyroclastic rock and basaltic porphyry with hydrocarbon shows.The volcanic facies of Emeishan basalt in Well Ys1 consist of mainly overflow facies,in association with effusive facies,eruptive facies and subvolcanic facies,and in profile it can be divided into 14 volcanic lithofacies with 3 volcanic-cycles.Emeishan basalt volcanic reservoirs are characterized by moderate-high porosity and low permeability with original pores and fractures(original gas pore,relic original pore,original shrinking fracture)and secondary pores and fractures(dissolution pore,structural fracture).The reservoir space has experienced evolution of volcanic stage,hydrothermal stage,epigenetic stage,and buried stage successively.Lithology,lithofacies,late stage fluid alteration,dissolution and tectonics are control factors of Emeishan basalt volcanic reservoirs,and the conservation of original pores,fractures and late stage dissolution are key factors of volcanic reservoir development.
作者
李香君
顾战宇
雍自权
潘菲
陈辉
董霞
吴清杰
Li Xiangjun;Gu Zhanyu;Yong Ziquan;Pan Fei;Chen Hui;Dong Xia;Wu Qingjie(Chengdu University of Technology Chengdu,Sichuan 610059,China;Sinopec Southwest Petroleum Company,Chengdu,Sichuan 610041,China)
出处
《矿物岩石》
CAS
CSCD
北大核心
2020年第1期100-112,共13页
Mineralogy and Petrology
基金
四川省科技计划项目2017JY0048。
关键词
峨眉山玄武岩
火山岩岩相
储层特征
Ys1井
四川盆地
Emeishan basalt
volcanic lithofacies
reservoir characteristics
Well Ys1
Sichuan Basin
