和什托洛盖盆地构造演化及油气成藏条件

ANALYSIS OF TECTONIC EVOLUTION AND OIL-GAS RESERVOIR FORMATION CONDITIONOF HESHITUOLUOGAI BASIN IN NORTHWEST XINJIANG

和什托洛盖盆地为准噶尔西北缘大型逆冲褶皱带的一个早中生代盆地。印支期的挤压推覆作用,使盆地雏形形成;燕山早期的区域伸展作用,使盆地沉积了巨厚的下、中侏罗统,边陡中拗的整体格局基本形成;在燕山晚期—喜马拉雅期,盆地南部边界向准噶尔盆地发生较大逆冲,形成完整的边界,且与准噶尔盆地完全隔离开来。由于盆地勘探程度较低,油气成藏条件缺乏系统研究,以油气地质理论为指导,分析了烃源岩条件、储盖条件、圈闭条件及运移条件等油气成藏的基本要素,认为和什托洛盖盆地拥有较好的生烃条件,发育多套储盖组合、不同类型圈闭和复合输导体系,具备形成油气藏的基本地质条件,具有良好的油气勘探前景。

Heshituoluogai Basin is an Early Mesozoic of the northwest thrusting folded zone of Junggar in Xinjiang,China.The basin rudiment formed because of extrusion and over thrusting during Indo-Chinese epoch;regional extensionmade basin deposit thick early and medium Jurassic formation,basically forming the pattem with steep slopeand down warping central region;during late Yanshan epoch and Himalayan epoch,the South border of basin overthrust Junggar Basin and was completely separated.As lower exploration degree,oil-gas reservoir formation conditionlack systematic and thoroughgoing research.Based on the oil-gas geological theory,the basic element of oil-gasreservoir,including hydrocarbon source rock condition,reservoir condition and cap rock condition,trap conditionand migration condition,etc.,are analyzed in this paper.Heshituoluogai Basin has fairly good hydrocarbon sourcerock,many reservoir-seal assemblages,different types trap and compound passage system,the basic element ofoil-gas reservoir formation,and Good prospects for the gas and oil exploration.