波斯湾油气风云与中国中西部油气开发

波斯湾盆地与中国中西部盆地同属特提斯构造域 ,有着类似的演化特征 :早期离散期形成裂谷盆地 ;中期漂移期形成克拉通盆地 ;晚期聚合期形成前陆盆地 ,构成大型叠合盆地。克拉通盆地内同期隆起有利于油气的早期运移富集 ;前陆盆地内褶皱—冲断带发育 ,裂隙常构成良好的储层形成晚期油气藏 ;构造枢纽带常构成油气富集带 ;碳酸盐—蒸发岩层序中孔隙—溶洞—裂缝构成完整的储集—渗滤体系 ,在总体上形成复合油气系统。中国中西部油气勘探新区应重视碳酸盐台地与碎屑重力流盆地之间的枢纽带。

ANALOGUE OF PETROLEUM EXPLORATION OF PERSIAN GULF AND THE MID-WESTERN PART OF CHINA

The Persian Gulf Basin and the basins in the mid-western part of China are both in the Tethyan domain,so that they have the similar evolution characteristics:the rift basin formed during the plate divergence period in the early stage;the cratonic basin formed during the plate drafting period in the middle stage;the foreland basin formed during plate convergence period in the late stage,and some of the large superimposed basins also formed in this stage.The synchronous high in the cratonic basin is the target of the hydrocarbon migration and accumulation in the primary stage.There are many fold-thrust belts developed in the foreland basins.Inside the fold-thrust belts,faults and fractures are also well developed.Following the fold-thursting,lots of hydrocarbon traps formed in the latest stage.The tectonic hinge is a significant region for the hydrocarbon accumulation.The carbonate-evaporite cycle promoted pore-cave-fracture type reservoirs forming,so that the compound petroleum system formed there.The tectonic hinge between the carbonate platform and clastic gravity flow basin is also an important area for oil and gas accumulation.So we should focus on this area during the frontier exploration in the mid-western part of China.