湘西吉首斜坡带下寒武统牛蹄塘组页岩气成气过程的流体包裹体证据:以湘吉地1井为例  

Fluid inclusion evidence on the shale gas formation process in the Lower Cambrian Niutitang Formation in Jishou slope zone,western Hunan Province-a case study of well XJD 1

作　　者：肖雪薇 陈红汉 刘秀岩 彭中勤[3] 李培军[3] 王保忠[3] XIAO Xuewei;CHEN Honghan;LIU Xiuyan;PENG Zhongqin;LI Peijun;WANG Baozhong(Department of Petroleum Geology,School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China;Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China;Wuhan Centre of Geological Survey,China Geological Survey,Wuhan 430205,China)

机构地区：[1]中国地质大学(武汉)资源学院石油地质系,湖北武汉430074 [2]中国地质大学(武汉)构造与油气资源教育部重点实验室,湖北武汉430074 [3]中国地质调查局武汉地质调查中心,湖北武汉430205

出　　处：《地学前缘》2023年第3期181-194,共14页Earth Science Frontiers

基　　金：国家自然科学基金重点项目(41730421)。

摘　　要：中国南方地区资源丰富,古流体活动频繁。基于湘西地区吉首斜坡带下寒武统牛蹄塘组的岩心资料,通过显微薄片、冷阴极发光、流体包裹体等多项实验测试综合分析,以牛蹄塘组黑色页岩脉体为重点研究对象,对湘西地区吉首斜坡带下寒武统牛蹄塘组页岩的流体活动与页岩气的成烃演化过程进行了初步探索。研究认为湘西地区牛蹄塘组脉体沉淀有白云岩、石英和方解石矿物,发育有单一脉体和混合脉体,碳酸盐脉体多与混合热流体有关(上升流和海水);流体包裹体以沥青包裹体、甲烷包裹体和盐水包裹体为主。结果表明与烃类演化相关的共有4期流体活动:早—中奥陶世、早志留世、早—中三叠世和古近纪。Southern China with frequent paleo-fluid activities possesses abundant natural resources.Based on the core data of the Lower Cambrian Niutitang Formation in Jishou slope zone,western Hunan,focusing on the black shale reservoir,we carried out a preliminary investigation of the regional fluid activities and hydrocarbon evolution through thin section,cathodoluminescence and fluid inclusion analyses and other experimental tests.The results show that dolomite,quartz and calcite minerals are deposited in the veins-both single and mixed veins-of the Niutitang Formation.Carbonate veins are mostly associated with mixed thermal fluids(upwelling fluid and seawater).The fluid inclusions are mainly bitumen,methane and saline inclusions.We identified four periods of fluid activities that are associated with hydrocarbon evolution:Early-Middle Ordovician,Early Silurian,Early-Middle Triassic and Palaeocene.

关 键 词：页岩气 流体包裹体 成气过程 牛蹄塘组 湘西地区 

分 类 号：P618.130.2[天文地球—矿床学] P571[天文地球—地质学] P579