渝东北地区下古生界页岩气聚集条件及资源潜力  

Accumulation conditions of Lower Paleozoic shale gas and its resources in northeastern Chongqing

作　　者：姜生玲[1,2] 汪生秀 洪克岩 朱亮亮 胡晓兰 JIANG Shengling;WANG Shengxiu;HONG Keyan;ZHU Liangliang;HU Xiaolan(School of Earth Sciences and Surveying Engineering,China University of Mining & Technology,Beijing 100083,China;Oil and Gas Exploration and Production Branch,China Huadian Green Energy Co.,Ltd.,Beijing 100160,China;Chongqing Institute of Geology and Mineral Resources,Chongqing 400042,China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国华电集团清洁能源有限公司勘探开发事业部,北京100160 [3]重庆地质矿产研究院,重庆400042

出　　处：《岩性油气藏》2017年第5期11-18,共8页Lithologic Reservoirs

基　　金：国土资源部全国油气资源战略选区调查与评价专项"渝东北地区页岩气资源战略调查与选区"(编号:2009GYXQ15);国家重大科技专项"来凤咸丰及鹤峰区块复杂构造区海相页岩气勘查评价应用试验"(编号:2016ZX05034004-004)联合资助

摘　　要：为了系统研究渝东北地区下寒武统水井沱组和上奥陶统五峰组—下志留统龙马溪组页岩气聚集条件,利用野外露头观测、实验测试分析、概率统计等多种方法,分别对2套页岩的分布、有机地球化学特征、储集条件及含气性进行了全面分析。结果表明:2套页岩均具有有机碳(TOC)含量高、成熟度高、厚度适中、有机质类型以腐泥型干酪根为主、含气量较高的特征;2套页岩均夹有薄层粉砂岩、细砂岩,富含石英、长石等碎屑组分,易于破裂形成裂缝、微裂缝,为页岩气的聚集提供了有利的物质基础及储集空间;2套页岩均对甲烷具有较强的吸附能力,现场解析平均含气质量体积分别为1.07 m^3/t和2.30 m^3/t。在此基础上,进一步确定了2套页岩有利区分布面积,采用条件概率体积法对其资源潜力分别进行了评价,得出下寒武统水井沱组和上奥陶统五峰组—下志留统龙马溪组页岩气资源量分别为0.42万亿m^3和0.38万亿m^3,均具有良好的页岩气勘探前景,城口地区的明中—厚坪一带和巫溪地区的咸水—文峰—大同一带均可作为渝东北地区页岩气勘探的有利区域。In order to evaluate Paleozoic shale gas potential in northeastern Chongqing,based on the methods of filed outcrops survey,experimental test and mathematical statistics,the distribution,source rock and reservoir conditions of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng-Longmaxi Formation were comprehensively analyzed.These shale rocks are characterized by high organic carbon content,high maturity,appropriate thickness and mainly type I kerogen.The results of field shale desorption show that the average gas content is1.07m3/t and2.30m3/t respectively.The siltstone and fine sandstone are easy for fracturing due to more quartz and other detrital components.These characteristics provide a favorable material basis and reservoir space for shale gas accumulation.Evaluated with conditional probability volume method,the shale gas resources of Shuijingtuo Formation and Wufeng-Longmaxi Formation are0.42×1012m3and0.38×1012m3respectively.Chengkou andWuxi should be favorable areas for shale gas exploration in the northeastern Chongqing.

关 键 词：页岩气 聚集条件 资源潜力 古生界 渝东北地区 

分 类 号：TE122[石油与天然气工程—油气勘探]