鄂西地区下震旦统陡山沱组二段剖面特征及页岩气地质意义  

Outcrop characteristics and shale gas geological significance of the second member in Doushantuo Formation of Lower Sinian in western Hubei

作　　者：李浩涵 包书景 张焱林 段轲 陈科 周志 宋腾 李飞 LI Haohan;BAO Shujing;ZHANG Yanlin;DUAN Ke;CHEN Ke;ZHOU Zhi;SONG Teng;LI Fei(Oil&Gas Survey,China Geological Survey,Beijing 100083,China;Hubei Institute of Geological Survey,Wuhan,Hubei 430074,China)

机构地区：[1]中国地质调查局油气资源调查中心,北京100083 [2]湖北省地质调查院,湖北武汉430074

出　　处：《油气藏评价与开发》2022年第1期171-180,共10页Petroleum Reservoir Evaluation and Development

基　　金：中国地质调查局地质调查项目“南方盆地页岩气调查评价”(DD20221653)。

摘　　要：随着黄陵背斜南翼下震旦统陡山沱组全球最古老页岩气的首次发现,该层系暗色页岩的含气性已获得证实。陡山沱组二段作为主力含气页岩层段分布广、沉积厚度大、页岩质量好。在鄂西地区选取典型的三斗坪镇头顶石村早震旦世剖面进行了地质测量,并针对陡山沱组二段开展小层划分和特征描述工作,证实该地区陡山沱组二段是一套具备生气潜力的白云质岩性组合。结合临近地质调查井秭地2井岩心资料及其测试分析数据,综合探讨了鄂西地区陡山沱组二段沉积特征、生烃条件和储层条件。认为该层段含气性受高演化程度的有机质丰度控制,依赖纳米级孔隙和微裂缝的吸附气是该常压层段页岩气的主要组成部分。With the first discovery of the world’s oldest shale gas in Doushantuo Formation of the Lower Sinian in the southern wing of the Huangling anticline,the gas-bearing property of the dark shale has been confirmed.As the main gas-bearing shale bed,the second member of Doushantuo Formation has wide distribution,large sedimentary thickness and good shale quality.Based on the geological survey,and the layers division and characterization of the typical Early Sinian outcrop in Toudingshi Village,Sandouping Town,western Hubei,it is proved that the second member of Doushantuo Formation in this area is a set of dolomitic lithologic assemblage with potential for gas generation.Combined with the core data of the adjacent geological survey Well-ZD-2,the sedimentary characteristics,hydrocarbon generation and reservoir conditions are comprehensively discussed.Results show that the high evolutionary level of the kerogen controls the formation gas content.The adsorbed gas which depends on the Nanometer pores and micro-fractures,is the main component of shale gas in the normal formation pressure.

关 键 词：页岩气 资源潜力 陡山沱组 震旦系 鄂西地区 

分 类 号：TE132[石油与天然气工程—油气勘探]