新疆焉耆盆地构造特征及其石油地质意义

新疆焉耆盆地是一个形成于南天山造山带基础之上的中生代拉分盆地。喜马拉雅造山事件以来,其南北两侧山体向盆地内对冲,形成典型前陆冲断褶皱构造,盆地内发育一系列台阶状断层及其断层相关褶皱。盆地两侧的对冲作用,使得盆地内侏罗系生油层得以进入生油成熟阶段。焉耆盆地构造演化特征表明,该盆地是一个有利含油气盆地。 

THE STRUCTURAL STYLES AND THEIR ROLE IN HYDROCARBON ACCUMULATION OF THE YANQI BASIN,NW CHINA

The Yanqi basin,which formed on the basis of South Tianshan orogenic belt in the Mesozoic,was a pull apart one.Since the Miocene Yanqi basin has been overthrusted from north by Tianshan belt and from south by Kuluktag belt because of the Himalayan orogenic event.The Yanqi basin is now one of foreland basins.A series of stepped thrusts and fault related folds occur in the Yanqi basin.The tectonic loadings resulted from the overthrusts induce source rocks of the Jurassic coalbeds and dark argillites to maturation period for hydrocarbon generation.We proposed that Yanqi basin is a favorable one for accumulation of oil and gas.