喀什坳陷石油地质特征

PETROLEUM GEOLOGY OF KASHI DEPRESSION.

从基底性质、盖层特征、构造、沉积发展等方面对喀什坳陷的石油地质特征进行了概述。指出，坳陷内局部构造十分发育，地面及钻井油气显示丰富，具有良好的生储盖组合，侏罗系为主力生油层，其次为上白垩统一下第三系生油岩；储层主要有上侏罗统库孜贡苏组、下白垩统克孜勒苏群砂砾岩及下第三系碳酸盐岩；盖层主要为上白垩统一下第三系古新统、中新统泥岩和膏泥岩层。在坳陷内既可寻找侏罗系自生自储油藏，也可寻找以中侏罗统杨叶组为生抽层以白垩系为储油层的古生新储油气藏，同时也可寻找以第三系为油源的原生油气藏及次生油气藏。

This paper briefly described the basement feature, caprock characteristics ,structure and sedimentology of Kashi depression, and suggested that there are well-deve-loped local structure, rich seepage and active oil (gas) show in the exploratory well . andbetter source-reservoir-caprock association ,in which Jurassic is main source bed , followedby Upper Cretaceous-Paleogene ; Kuzigongsu formation (Upper Jurassic), Kezilesu groupsand conglomerate (Lower Cretaceous) and carbonate rock (Paleogene) as niain reser-voirs; mudstone and gypsiferous mudstone (Upper Cretaceous-Paleocene and Miocene) as niain caprocks. Jurassic authigenic reservoir,' down-sourced' reservoir (Yangye forma-tion of Middle Jurassic is source rock, and Cretaceous reservoir) , as well as primary andsecondary oil/gas reservoirs (Teriary is source rock) can be found in Kashi depression.