摘要
为了评价鄂西建始地区大隆组黑色页岩的勘探开发潜力,采用场发射扫描电镜、X射线衍射、低温N_2吸脱附、甲烷等温吸附实验等手段,分析了其储层特征和有机地球化学特征。结果表明,大隆组页岩储集空间以矿物溶蚀孔、有机质孔为主,石英等脆性矿物含量较高,孔隙度为0.65%～2.79%,渗透率为0.000 8～0.462 1 mD,属于特低孔、特低渗储层。页岩有机质丰度较高,TOC质量分数为1.62%～13.60%,具有良好的形成页岩气的物质基础。有机质类型以Ⅱ型干酪根为主,处于过成熟晚期阶段。现场解析法测得富有机质页岩含气质量体积为0.741～3.703 m^3/t,平均为2.714 m^3/t。页岩吸附气含量与有机碳含量、孔隙度均呈正相关关系,与石英含量和有机成熟度均呈弱的正相关性。建始地区大隆组页岩具有较好的页岩气生烃和储集条件,具备一定的开采价值。
In order to evaluate the exploration and development potential of the black shale of Dalong Formation in Jianshi area,western Hubei,the reservoir characteristics and organic geochemical characteristics of shales in the study area were analyzed by means of FE-SEM,XRD,low temperature N2 adsorption isotherms and CH4 adsorption isothermal experiment.The results show that the shale reservoir spaces are dominated by mineral dissolved pores and organic pores,and quartz is the major brittle mineral in shale,which has reached mediumhigh level.The shale is classified as ultra-low porosity and ultra-low permeability reservoir with a rock porosity of 0.65%-2.79%and a permeability of 0.000 8-0.462 1 m D.The TOC content ranges from 1.62%to 13.60%,indicating its high organic material content and good material basis for shale gas.The kerogen type is mainlyⅡ,and the Ro has reached later over-mature stage.The gas content of shale samples is 0.741-3.703 m3/t,with an average of 2.714 m3/t.The adsorbing gas content appears a positive correlation with TOC content and porosity,and shows week correlation with quartz content and organic maturity.The shale of Dalong Formation in Jianshi area deserves to be exploited due to its good hydrocarbon potential and reservoir conditions.
作者
仇秀梅
刘亚东
董学林
QIU Xiumei;LIU Yadong;DONG Xuelin(Hubei Geological Research Laboratory,Wuhan 430034,China;Hubei Urban Construction Vocational and Technological College,Wuhan 430205,China)
出处
《岩性油气藏》
CSCD
北大核心
2019年第2期96-104,共9页
Lithologic Reservoirs
基金
湖北省自然资源厅科技项目"页岩有机地球化学参数与含气量相关性及成藏机理研究"(编号:ETZ2017A01)资助
关键词
页岩
储层特性
有机地球化学
含气性
大隆组
shale
reservoir characteristics
organic geochemistry
gas-bearing property
Dalong Formation
作者简介
仇秀梅(1987—),女,博士,工程师,主要从事固废综合利用、环境污染物检测等研究工作。地址:(430034)湖北省武汉市硚口区古田五路9号。Email:303984566@qq.com。
