中国西部主要盆地油气形成特征

HYDROCARBON GENERATION CHARACTERISTICS OF MAJOR BASINS IN WESTERN CHINA.

中国西部盆地（塔里木、准噶尔、吐哈、柴达木）有古生代海相和中、新生代陆相多种成油体系，克拉通内古隆起及其斜坡和前陆盆地是大中型油气田富集区。侏罗系煤系地层煤、泥岩均能生烃，富油又富气，形成自生自储式油气藏和下生上储的次生气藏。凹陷带强烈沉降，烃源岩厚，油气形成多阶连续。多期构造运动促使西部盆地油气为多次运移、多期成藏及晚期成藏。

Western basins(i.e. Tarim, Junggar, Turpan Hami, Qaidam) in China possess several oil forming systems including Paleozoic marine sediments and Cenozoic terrestrial sediments. Intracratonic paleouplift and its slope and foreland basin are large and medium sized oil/gas accumulation belts. Coal and shale in Jurassic coal measure are oil and gas enriched, autogenetic reservoir and “lower generation and upper reservoir' secondary reservoir can be found. Multiple period tectonic events resulted in multiple times oil/gas migration, multiple period reservoir forming and later reservoir forming in western basins.