塔里木残余盆地的生、排烃演化规律

EVOLUTION RULE OF HYDROCARBON GENERATION AND EXPULSION IN TALIMU RESIDUAL BASIN

塔里木古生界盆地是一个经历过多期改造的残余盆地，其地质特征和演化规律高度复杂，勘探难度很大。通过对该盆地开展三维盆地模拟，计算了该盆地在各次主要构造运动前后的生烃量、排烃量和剥蚀油气损失量，总结出该盆地的生、排烃演化规律。研究表明塔里木盆地虽然遭受过三次强烈的破坏，但最主要的破坏期是泥盆纪末的海西早期。当时残留的油气量比损失量大好几倍，并且构造期后的再次生、排烃量仍然非常巨大。因此该盆地从生排烃贡献量看应当具有广阔的勘探前景。

The Talimu Paleozoic basin is a residual basin undergone multiphase reformation,its geological characteristics and evolution rules are quite complex,which cause a large difficulty in exploring oil and gas.Through a research on 3-D basin simulation,the hydrocarbon generating and expelling quantities and the hydrocarbon loss quantity by denudation before and after each major tectonic movement in the basin are calculated and the evolution rule of hydrocarbon generation and expulsion in the basin is summarized up too.It is shown that although the Talimu Basin was suffered strong destruction for three times,the most significant destructive stage was the early Hercynian at the end of Devonian.At that time,the relict hydrocarbon quantity was several times larger than the hydrocarbon loss quantity and the post tectonic hydrocarbon generating and expelling quantities were also very large,therefore this basin should be of a wide exploration potential from the point of hydrocarbon generating and expelling quantities.