2016年2期

鄂西地区寒武系黑色页岩地质特征及页岩气远景预测

发布时间:2016-09-05阅读次数:

【期数】2016-2

【作者】李 海,刘 安,危 凯,李继涛

【机构】中国地质调查局武汉地质调查中心,武汉 430205

【关键词】寒武系;黑色页岩;地质条件;页岩气远景;鄂西地区

【中文摘要】通过对野外地表露头、钻井岩心及典型剖面等基础资料的分析,从烃源岩品质、生烃演化阶段、储层特征和保存条件四个方面入手,阐述了鄂西地区寒武系黑色页岩的地质特征,采用综合信息叠合法预测了页岩气资源远景区。结果表明,寒武系牛蹄塘组黑色页岩分布广,厚度大,有机碳含量(TOC)高,有机质类型好,热演化程度高,具备良好的生烃潜力;在宣恩—鹤峰和宜昌—宜都一带,受构造活动改造弱,黑色页岩埋深适中,盖层分布连续,断裂不发育,流体封闭性强,可作为页岩气勘探的有利远景区。

【英文摘要】Through the analysis of basic data such as field surface outcrops, drilling cores and typical profile, source rock quality, four items including evolution stage of organic matter, reservoir characteristic and preservation condition have been studied to illustrate the geological characteristics of Cambrian black shale in Western Hubei. It was on this basis that shale gas prospective areas were predicted using comprehensive information method. The result indicate that the Niutitang formation of Cambrian black shale in the study area were characterized by wide distribution, great thickness, high organic content, good kerogen type, high thermal evolution degree and great hydrocarbon generation potential. In addition, the region in western hubei, where were weakly affected by tectonic activity, well buried depth for shale, continuous distribution for cover layer, reservoir undeveloped fault-fracture and great sealing property, could be considered as favorable prospect areas for the shale gas exploration.

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