塔里木台盆区有效源岩排烃特征及石油地质意义

根据排烃门限理论 ,利用生烃潜力法研究了塔里木盆地台盆区中下寒武统和中上奥陶统 2套烃源岩在不同地质时期的排烃特征 .研究表明 ,寒武—奥陶系源岩存在 3个重要排烃期 :加里东晚期 (O -S)、晚海西—印支期 (C -T)和燕山—喜山期 (K -Q) ;中下寒武统源岩累积排烃量 35 87亿t ,第一、第二个排烃期为其排烃高峰 ,早期成藏为主 ;中上奥陶统源岩累积排烃量 714亿t ,从石炭纪开始大量排烃 ,第三个排烃期为其重要排烃阶段 ,晚期成藏为主 ;供烃中心在地质历史过程中不断发生变迁

Hydrocarbon expulsion characteristics of effective source rock in Talimu Craton Basin and their significance of petroleum geology

The hydrocarbon expulsion characteristics of two sets of hydrocarbon source rocks --middle-lower Cambrian system (C_(1+2)) source rock and middle-upper Ordovician system (O_(2+3)) source rock in different geologic ages are studied according to the threshold of hydrocarbon expulsion theory and hydrocarbon generation potential. It is shown that there are three major hydrocarbon expulsion stages: late Caledonian (O-S), late Hersynian-Indosinian (C-T) and Yanshanian-Himalayan (K-Q); the total of expulsion hydrocarbon of C_(1+2) source rock is 3587×10~8 t, the first and the second expulsion hydrocarbon stages are its peaks, and the hydrocarbon is provided mainly for early reservoirs; the total of hydrocarbon expulsion of O_(2+3) source rock is 714×10~8 t, the third hydrocarbon expulsion stage is its peak, O_(2+3) source rock begins to largely expulse hydrocarbon from Carboniferous and provides hydrocarbon mainly for late reservoirs; The hydrocarbon expulsion centers lie in the different parts of Talimu Craton Basin in the history.