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Characterization of Jurassic shale reservoirs and the geological background of shale gas accumulations in Tarim Basin
Author(s): 
Pages: 647-659
Year: Issue:  4
Journal: Acta Petrolei Sinica

Keyword:  reservoir propertypore typemineral compositionshaleJurassicTarim Basin;
Abstract: 页岩气作为重要的非常规能源之一,具有巨大的勘探和开发前景.中国塔里木盆地侏罗系泥页岩作为典型的陆相泥页岩,主要发育于沼泽化浅湖、半深湖、河漫沼泽、河漫湖泊以及滨湖沼泽相,有机质类型以Ⅲ型为主,有机碳含量多介于0.5%~3%,镜质体反射率多为0.5%~2%.塔里木盆地侏罗系泥页岩累计厚度20~400m,埋深主要介于2000~8000m,主要分布于库车坳陷、塔西南地区以及塔东北地区.塔里木盆地侏罗系泥页岩矿物组成以石英和黏土矿物为主,黏土矿物以伊利石为主.岩石孔隙度主要介于0.5%~4%,渗透率主要为0.006~0.01 mD.晶间孔、溶蚀孔、有机质孔等纳米级孔隙以及微裂隙较发育,常见微裂隙多为1~3μm宽.泥页岩的最大吸附气量介于1~2 m3/t,最大吸附气量与总有机碳含量及黏土矿物含量呈良好的正相关关系.塔里木盆地侏罗系泥页岩储集性能较好,其分布及地球化学特征与美国五大含气页岩及四川盆地下古生界页岩相似,具有较大的页岩气勘探潜力和开发前景,库车坳陷和塔西南地区是最为有利的页岩气发育区.
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