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库车坳陷中侏罗统页岩气地质特征及有利区预测

Keywords: 页岩气,地质特征,有利区,中侏罗统,库车坳陷

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Abstract:

?库车坳陷中侏罗统发育富有机质的煤系烃源岩和湖相泥页岩,具有良好的页岩气勘探前景,综合运用有机地球化学、岩石学和等温吸附等分析测试手段,系统分析库车坳陷中侏罗统富有机质泥页岩分布特征、有机地球化学特征、储层特征和含气性,初步优选了页岩气富集的有利区。库车坳陷中侏罗统陆相泥页岩厚度较大,有机质类型以ii2—ⅲ型为主,总有机碳含量平均值约为3.1%,镜质体反射率多介于0.5%~1.6%之间,具有良好的页岩气生气条件|矿物组成主要为石英和黏土矿物,黏土矿物以伊利石和伊/蒙混层为主|孔隙度介于0.5%~7.3%之间,渗透率多小于0.1×10-3μm2,属于低孔超低渗储层|储集空间主要包括纳米—微米级矿物基质孔、有机质微孔、构造微裂缝和成岩微裂缝等类型|最大吸附气量多介于0.5~8m3/t之间,含气性主要受有机碳含量和矿物成分的影响。综合分析得出克拉苏构造带北缘和依奇克里克构造带克孜—依西地区是库车坳陷中侏罗统陆相页岩气富集的有利区。?

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