摘要
沉积环境对页岩气资源的富集地质条件起着控制作用。通过野外露头观察,运用室内分析化验、扫描电镜等技术,以实际资料为依托,对巴彦浩特盆地北部三角洲沉积环境页岩和南部障壁海岸沉积环境页岩的有机地化特征和储层物性特征进行了对比,分析了不同沉积环境页岩气富集地质条件的差异性。研究结果显示,三角洲环境页岩有机碳含量较高,干酪根类型以Ⅲ型为主,其生气条件优于障壁海岸沉积环境页岩;而障壁海岸环境页岩脆性矿物含量高,内部孔隙隙结构多样,孔渗性较好,更有利于页岩气资源的储集及后期开发过程中的压裂作业。
Sedimentary environment has a control action on geological condition of shale gas accumulation. By observing the field outcrops, using laboratory analysis and scanning electron microscope technologies, the different organic geochemical characteristics and reservoir physical properties between the shales developed in deltaic sedi- mentary environment in the northern of Bayan Hot basin and the shales developed in barrier coast sedimentary envi- ronment in the southern of Bayan Hot basin were compared, and the differences of geological condition shale gas ac- cumulation of the two sedimentary environment was analyzed base on the actual data. The result indicated that the organic carbon content is higher in the shales developed in deltaic sedimentary environment, and the Kerogen type in this environment is dominated by 11 type, so its gas generating conditions is better than the shales developed in barrier coast sedimentary environment; On the other hand, the shales developed in barrier coast sedimentary envi- ronment contents more brittle minerals, further more, its inner pore structure various and pore ratio and permeabili- ty is better, which make it be more benefieial to the reservoir of shale gas and fraeturing operation in the develop- ment Process.
出处
《科学技术与工程》
北大核心
2014年第35期196-201,共6页
Science Technology and Engineering
基金
全国页岩气资源潜力调查评价及有利区优选课题(2009QYXQ15-07-12)资助
关键词
页岩气
沉积环境
富集条件
控制作用
shale gas sedimentary environment geological condition control action
