摘要
新疆三大盆地油气生成、运移有四大高峰期,且与圈闭形成高峰期相对应,因而造就了盆地成藏的四大高峰期.那些在多期成藏过程中不断获得油气供给的圈闭,可形成大型油气藏.油气分布受大型隆起带、断裂背斜带与斜坡带的控制,形成隆起被覆背斜型、前陆掩冲带型与斜坡断阶带型三大复式油气聚集组合.
Abstract
Tarim, Junggar and Turpan-Hami Basins in Xinjiang are multicyclic ones characterized by the superimposition of multiphase and multi-prototype basins. During their evolution process, several times of extensions and compressions took place alternately, thus leading to the formation of the basic tectonic framework of uplifts alternated with depressions, or convexes with sags. Some successive depressions or sags were therefore received several suites of source beds. The hydrocarbon generating periods of different source beds had met and even coincided with each other in certain periods of time. This resulted in four peak periods of hydrocarbon generation, i. e. the end of Early Paleozoic to Devonian,Permian to Triassic, the end of Jurassic to Cretaceous as well as the end of Tertiary to Quaternary. Several regional tectonic movements happened coincidding with or a bit later than the four peak periods, so that hydrocarbon expulsion and trap formation took place contemporaneously in the basins, and this thus decided the peak periods of oil/gas fomation. Hydrocarbon distribution of the basins is mainly controlled by the large uplift zone,fault-anticline belt and slope-faulted terrance led to the formation of three major composite hydrocarbon accumulation belts such as the uplift-drape anticline type, foreland overthrust belt type and slope-faulted terrance type. These are the primary targets for hydrocarbon exploration in future.
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