从地质发展历史分析准噶尔盆地油气前景

准噶尔盆地属天山—兴蒙海西地槽褶皱系的一个组成部分,具有前震旦纪古老的中间地块。在泥盆—石炭纪时被周缘地槽包围,海水侵漫,其上沉积了最初的海相地层,是深部的油源岩。自二叠纪以来,盆地上升为陆。早二叠世为多凹多凸的断陷盆地,具有海陆交互相地层,晚二叠世开始至第三纪则为统一的陆相大型坳陷盆地。
本文从(1)多旋回沉积有利于生、储、盖的组合;(2) 盆地长期稳定持续下沉有利于油气的生成和转化;(3) 古隆起区是油气运移的指向;(4)区域构造控制油气藏圈闭的构造样式等四个方面讨论了准噶尔盆地是我国含油气盆地中最优惠的一个盆地。

THE ANALYSIS OF OIL AND GAS PROSPECT IN JUNGGAR BASIN FROM GEOLOGICAL DEVELOPMENTAL HISTORY

Junggar Basin, a part of T ianshan - Xingmong Hercynian gcosycline fold system, possesses a Presinian mid - massif. It was surrounded by circumferential geosydines from Devonian to Carboniferous Period. And because of transgression the original marine formation which is the source rock in deep was disposted on it. The basin rose and became continent since Permian Period. In early Perm ian Epoch ii became a multi - downfalling and uprising fault - subsided basin and posse-ssed alternating sequences of marine and nonmarine formations. From late Permian Epoch to Tertiary Period it became a large united continental depression basin.
This paper discussed that Junggar Basin is a best one of petroliferous basins in china owing to following four aspects: (1) multicycle sedimentation was good to the com bination of source rock, reservoir and cap rock; (2) that basin continued to submerge steadily for longtime was profitable to the generation and transdirection of hydrocarbon; (3) the paleouplifts were the direction of hydrocarbon migration; (4) regional structures controlled the structura models of oil gas traps.