摘要
为研究川南地区大村区块五峰—龙马溪组页岩气成藏条件,开展了野外地质调查、二维地震勘探、分析测试和综合研究等工作。结果表明:研究区五峰—龙马溪组下段形成于深水陆棚相,岩性以泥页岩为主,厚度为20~40 m,分布稳定,由东南向西北逐渐增厚;优质页岩段具有有机碳含量高、热演化程度高、多种孔隙类型发育、可改造性好、吸附能力强、含气性较好等特征;后期构造改造强度相对较弱、埋深适中、顶底板封隔性好,保存条件较好;较之于长宁、太阳等建产页岩气区块,具有较为相似的静态地质参数。该区五峰—龙马溪组具有较好的页岩气成藏条件,具备进一步开展勘探工作的潜力。
In order to study the accumulation conditions of shale gas in the Wufeng-Longmaxi formations of the Dacun block,southern Sichuan Province,field geological survey,two-dimensional seismic exploration,analytical test and comprehensive research were conducted.The results show that the lower part of the Wufeng-Longmaxi formations mainly consists of shale developed in deep-water shelf facies and is widely distributed in the study area with a thickness of 20-40 m,and gradually thickens from southeast to northwest.The high-quality shale intervals are featured with high organic carbon content,high degree of thermal evolution,and development of various pore types,good transformability,strong adsorption capacity,and good gas-bearing properties.The Dacun block show relatively weak structural strength and moderate buried depth.Well-developed sealed rocks at the top and the bottom of the Wufeng-Longmaxi formations indicate good gas preservation conditions.The static geological parameters of the study area are similar with those of Changning,Taiyang and other shale gas blocks.It is concluded that the Wufeng-Longmaxi formations of the Dacun block have good shale gas accumulation conditions,and good potential for further exploration.
作者
赵文峰
龙潇
王小春
丁飞飞
Zhao Wenfeng;Long Xiao;Wang Xiaochun;Ding Feifei(Sichuan Coal Field Dadi Investment Limited Company,Chengdu 610072,Sichuan,China;Sichuan Institute of Coal Field Geological Engineering Exploration and Designing,Chengdu 610072,Sichuan,China;Key Laboratory of Shale Gas Evaluation and Exploitation of Sichuan,Chengdu 610072,Sichuan,China)
出处
《地质学刊》
CAS
2022年第4期358-365,共8页
Journal of Geology
基金
四川省重大科技专项“四川盆地海相高演化页岩高有机质孔隙发育机制及含气量评价研究”(2020ZYD027)
四川省煤田地质科研项目“川南石屏—大村区块龙马溪组页岩气成藏及保存条件研究”(川煤地〔2019〕73号)。
关键词
富有机质页岩
成藏条件
五峰—龙马溪组
页岩气
大村区块
川南地区
organic-rich shale
accumulation condition
Wufeng-Longmaxi formations
shale gas
Dacun block
southern Sichuan
