新疆天山构造带中小型山间盆地构造特征及油气勘探方向

CHARACTERISTICS OF MODERATE-SMALL- SIZE INTERMONT BASINS STRUCTURES AND PROSPECTS FOR OIL-GAS EXPLORATION IN TIANSHAN MOUNTAIN STRUCTURAL BELTS

新疆天山构造带中的中小型山间盆地是在海西期褶皱基底之上形成的。它们经历了晚二叠世断陷湖、三叠一侏罗纪坳陷型湖泊－沼泽及白垩纪一新生代收缩型山间盆地３个成盆期。燕山运动控制着盆地次一级构造单元的格局及局部构造的形成。喜马拉雅运动控制着局部构造和断裂的最后定型以及油气运移、聚集成藏。这些山间盆地具有形成中小型油气田的基本石油地质条件，应引起我们的高度重视。

Moderate-small size intermont basins in Tianshan Mountain structural belts in Xinjiang were formed on Hercynian folded basement which have been undergone three basining periods,including Late Permian downfaulted lakes,Triassic-Jurassic depressional lake-swamp and Cretaceous-Cenozoic contractional intermont basins.Formation of the secondary structural units of the basin and formation of local structures are controlled by Yanshan movement.The Himalayan movement controls final stereotype of local structures and faults,hydrocarbon migration and accumulation for forming reservoirs are also controlled by it.Exploration of these intermont basins should be highly valued because they possess main petroleum geology conditions of the formation of moderate-smallsize oil and gas fields.