塔西南喀什拗陷石油地质特征的再认识

本文通过对塔西南喀什拗陷石油地质条件的再认识,确认了中侏罗统扬叶组是本区中、新生界的主力生油岩,下白垩统克孜勒苏群中的风成砂岩为优良的储集层,覆盖其上的上白垩统和下第三系为多层系封盖性好的区域盖层,尤其是古新统阿尔塔什组石膏层更为理想的遮盖层。它们在纵横向上构成了有机的油气生储盖匹配。据此在喀什拗陷选择合适构造进行勘探,可望有新的突破。 

A NEW UNDERSTANDING OF THE CHARACTERISTICS OF PETROLEUM GEOLOGY IN THE KESHI DEPRESSION,SOUTHWEST TARIM

With a new understanding of petroleum geologic conditions in the Keshi Depression, southwest Tarim, the authors believe that the middle Jurassic Yangye Formation is the major source rocks in the Meso-Cenozoic systems of the area, the Kezilesu Gr. aeolian sandstones of the Lower Cretaceous could be excellent reservoirs and the overlying Upper Cretaceous and Paleogene systems are well-developed regional multiseals, among which the Artashi Fr. gypsum rocks of Palaeocene would be the best. Therefore the source rock, reservoir and regional seals may vertically and horizontally compose of an oil/gas assemblage in the depression. Based on the above considerations, a breakthrough in oil/gas exploration would be expected in proper structures.