摘要
随着"重庆涪陵"等国家级页岩气示范区的建立,四川盆地东部下古生界五峰组—龙马溪组富有机质页岩已成为目前中国页岩气研究的重点目标之一,至今已取得了大量相关研究成果,但关于页岩气研究的基础——页岩岩相分类的方案一直存在很大的分歧。以川东地区下古生界五峰组—龙马溪组页岩为研究对象,通过野外剖面与钻井岩心的观察,结合岩石结构组分分析,利用石英含量、石英成因及纹层类型3种判别依据,对页岩岩相进行了划分,并根据川东地区WQ2井的含气量、有机碳含量及石英含量,对岩相与储层的关系进行了评价。研究区页岩岩相可划分为7种类型:贫硅纹层页岩岩相、中硅纹层页岩岩相、富硅纹层页岩岩相、贫硅无纹层页岩岩相、中硅无纹层页岩岩相、富硅无纹层页岩岩相及生物硅质成因页岩岩相,其中,中硅无纹层页岩岩相是川东地区最有利于页岩气富集的岩相。
With the establishment of the ＂Chongqing Fuling＂ national demonstration zone of shale gas, organic-rich shale of the Lower Paleozoic Wufeng-Longmaxi Formation has become a key research objective in the eastern Sichuan Basin, and a larger number of relevant research results have been obtained. However, there has been a great divergence in the scheme of the shale lithofacies classification. The quartz content, quartz genesis and shale lamina type were applied to divide the shale lithofacies based on field geological profile, core observation and shale structure component. According to the gas content, total organic carbon content and quartz content of the Well WQ2 in the eastern Sichuan Basin, the relationships between shale lithofacies and reservoir properties were evaluated. The shale lithofacies was divided into seven types： silicon-poor laminar shale facies, silicon laminar shale facies, silicon-rich laminar shale facies, silicon-poor non-laminar shale facies, silicon non-laminar shale facies, silicon-rich non-laminar shale facies and biological siliceous shale facies. It is considered that the silicon non-layer shale facies is favorable for shale gas accumulation in the eastern Sichuan Basin.
作者
朱逸青
王兴志
冯明友
李可
Zhu Yiqing Wang Xingzhi Feng Mingyou Li Ke(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China Siehuan Provineial University Key Laboratory of Natural Gas Geology, Southwest Petroleum University, Chengdu 610500, China)
出处
《岩性油气藏》
CSCD
北大核心
2016年第5期59-66,共8页
Lithologic Reservoirs
基金
国家自然科学基金项目"页岩气低成本高效钻完井技术基础研究"(编号:U1262209)资助
关键词
页岩气
页岩岩相
五峰组
龙马溪组
川东地区
shale gas
shale lithofacies
Wufeng-Longmaxi Formation
eastern Sichuan Basin
