页岩油藏的成藏条件及中国页岩油藏有利区展布

Conditions of Shale Oil Accumulation and Distribution of Favorable Areas in China

中国页岩油资源量十分丰富,阐明中国含油气盆地石油地质特征及页岩油藏的成藏条件,对于查明中国页岩油藏的有利分布区具有重要意义。页岩油藏成藏地质条件包括两大方面:大规模分布的成熟度适中的腐泥型、富有机质泥页岩提供了页岩油成藏的物质基础;渗透性相对较好的夹层或裂缝发育的页岩层为有利页岩油储集层。中国各盆地石油地质特征分析表明,古生界、中生界和新生界湖相中厚层富有机质泥页岩层系的页岩油成藏条件较好,为中国页岩油藏的主要有利区,包括准噶尔盆地二叠系、三塘湖盆地二叠系、鄂尔多斯盆地三叠系、四川盆地侏罗系、松辽盆地白垩系、渤海湾盆地古近系、苏北盆地古近系、江汉盆地古近系、南襄盆地古近系。其中鄂尔多斯盆地三叠系延长组与松辽盆地白垩系青山口组页岩油地质条件最佳。

Shale oil resources are rich in China.To clarify the petroleum geologic characteristics the shale oil accumulation conditions ofChina＇s petroliferous basins is of great significance for finding out the favorable distribution areas of shale oil reservoirs.The conditions ofshale oil reservoirs include the large-scale organic-rich mudstone/shale layers with moderate thermal maturity and sapropelic kerogen thatprovide material for shale oil accumulation; the interlayers with relatively good permeability or shale with fractures that are favorable shaleoil reservoirs.In China,the Paleozoic,Mesozoic and Cenozoic lacustrine middle-thick organic-rich mudstone/shale intervals are of betterconditions for shale oil accumulation,which are the major domains of shale oil reservoirs,including Permian strata in Junggar and Santang-hu basins,Triassic stratum in Ordos basin,Jurassic stratum in Sichuan basin,Cretaceous stratum in Songliao basin,and Paleogene strata inBohai Bay,North Jiangsu,Jianghan and Nanxiang basins.Among them,the Triassic Yanchang formation in Ordos basin and the CretaceousQingshankou formation in Songliao basin are the best in shale oil geologic conditions.