湘西北下志留统龙马溪组页岩气成藏条件及勘探潜力分析  

Accumulation conditions and exploration potential of shale gas in Lower Silurian Longmaxi Formation,Northwestern Hunan

作　　者：范二平[1] 唐书恒[1] 姜文[1] 孙昌花 张成龙[1] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083

出　　处：《西安石油大学学报（自然科学版）》2014年第4期18-23,30,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金项目(编号:41272176/D0208);高校博士点基金项目(编号:20110022110007)资助

摘　　要：对湘西北地区下志留统龙马溪组进行野外地质勘查和样品采集,并进行相关实验分析。研究认为：龙马溪组黑色页岩厚度大,最厚可达150 m;有机碳含量高,平均1.02%;Ro值处于1.06%-4.28%之间,热演化程度高;页岩中微孔隙和微裂缝较发育,为页岩气提供了足够的储集空间。等温吸附实验也表明,龙马溪组页岩具有较强的气体吸附能力,平均1.58 m3/t。因此,湘西北地区下志留统龙马溪组具有形成页岩气藏的良好潜力。根据研究区页岩厚度、有机碳含量、成熟度分布特征以及储层物性等方面的综合分析,认为桑植东北部、龙山—永顺一带为页岩气勘探有利区。Based on the data of shale outcrops,sampling and laboratory analysis,the reservoir forming conditions and exploration potential of shale gas in Lower Silurian Longmaxi Formation in Northwestern Hunan are investigated. It is shown that Longmaxi Formation black shale is of great thickness,maximum thickness is 150 m,high organic carbon content,the average value is 1. 02%,and high thermal evolution degree,Ro is 1. 06% ~ 4. 28%. There developed micropores and microfractures in shale matrix,which provide enough storage space and migration pathways for shale gas. Besides,isothermal adsorption experiments show that Longmaxi Formation black shale is of strong adsorption ability to gas,the average adsorption capacity is 1. 58 m3/ t. Therefore Longmaxi Formation black shale has a good potential forming shale gas reservoirs. According to the comprehensive analysis of shale thickness,organic carbon content,maturity distribution and reservoir physical properties in the research area,it is held that there are two shale gas exploration potential areas: northeast Sangzhi and Longshan-Yongshun zone.

关 键 词：页岩储层特征 成藏条件 勘探有利区 下志留统龙马溪组 湘西北 

分 类 号：TE122[石油与天然气工程—油气勘探]