准噶尔盆地中部油气充注与调整过程分析

Process analysis of hydrocarbon charging and adjustment in central area of Junggar Basin

准噶尔盆地是我国西部压扭性叠合盆地,盆地内发育2套含油层系,普遍存在异常高压,地史时期历经印支、燕山与喜山3次主要的构造断裂活动及3期主要的油气充注过程;盆地中部受多期构造活动影响,油气分布关系复杂。为明确研究区油气富集规律,文中以油气成藏期次为主线,通过古构造恢复,剖析地质历史时期3个关键时期的油气充注特征,动态分析了各时期断裂输导体系、不整合面、异常高压,以及烃源岩成烃演化之间的内在耦合关系,建立了地质历史时期油气充注与调整过程的演化模式,明确了不同时期油气充注过程的成藏主控因素。

Junggar Basin is a transpressional superimposed basin in western China. Two sets of oil-bearing measures develnped in the basin. Abnormal pressure was generally widespread. Indnsinian. Yanshanian and Himalayan structural activities and main three hydrocarbon eha,＇ging processes were undergone in terrestrial time. with hydrocarbon distribuliotl complex. To make clear the hydrnearbnn aeeumulatinn regularity, hydrocarbon charging features in three key stages of geological historical period is analyzed in terms of hydrocarbon accumulation stage through palaeostmeture reennstruction, inner coupling rclationships among fracture conducting system, t,nennformity surface, abnormal pressure and hydrocarbon evolution nf source rock are dynmically analyzed. Process evolution pattern of hydrocarbon charging and adjustment of geolngical historieal stage, has been established. which makes clear the main control factors of hydrnearbon aecunmlatinn during hydrocarbon charging at ditfferent periods.