川西坳陷上三叠统-侏罗系烃源岩生烃史研究

运用盆地模拟技术研究上三叠统及侏罗系各烃源岩层生烃特点、成烃贡献。在川西坳陷生气量计算方法上，利用BASIMS 4.5盆地模拟软件，定量化研究了川西8个构造区带的烃源岩生烃史。研究认为，主力烃源岩是上三叠统，其生烃高峰从中侏罗世起到晚侏罗世，结合川西致密化特点确定了油气成藏期，重塑了不同区带对应于生烃高峰时期的生气量和古构造。勘探实践证实：已发现气田基本都在燕山中晚期（生烃高峰）形成的这些古隆起带上。

RESEARCH ON THE HYDROCARBON GENERATION HISTORY OF THE SOURCE ROCKS IN UPPER TRIASSIC SERIES AND JURASSIC SERIES IN WEST SICHUAN DEPRESSION

The hydrocarbon generation characteristics and hydrocarbon formation contributions of the source rock strata in Upper Triassic Series and Jurassic Series in West Sichuan Depression are studied by basin modeling. By the method of calculating gas generation volume, the hydrocarbon generation histories of the source rocks in 8 tectonic areas in West Sichuan Depression are quantitatively studied with basin modeling software, BASIMS4.5. The research result indicates that Upper Triassic formation is main source rock and the peak period of hydrocarbon generation is from Middle Jurassic to Late Jurassic. According to the characteristics of reservoir tightness, the oil-gas rerservoiring period is determined and the hydrocarbon generation volumes and palaeostructures corresponding to the hydrocarbon generation peaks in the different tectonic areas are rebuilt. It is proved by exploration that the discovered gas fields mostly lie in the palaeouplifts formed in Yanshan middle-later period (the peak period of hydrocarbon generation).