中文摘要：

油气储层中不同时期所充填的矿物和流体包裹体可以揭示油气的成藏过程。四川盆地高石梯构造震旦系灯影组储层至少有3期矿物充填：白云石→沥青→石英／白云石＋石英。早期的白云石中富含油包裹体；晚期的石英中富含液态甲烷包裹体，烃类包裹体的捕获压力为79．4-98．12 MPa，压力系数为1．35-1．88，显示超压特征。现今气藏的压力系数为1．06-1．13。高石梯气藏具有多期成藏特点，属于构造调整气藏。其可能的成藏过程为：二叠纪－三叠纪末期，古油藏形成；侏罗纪－晚白垩世，古油藏中的石油在原位开始裂解形成超压古气藏；喜马拉雅早期，古气藏向资阳－威远方向迁移和被破坏；喜马拉雅中晚期，磨溪地区的古气藏迁移调整至高石梯地区重新成藏。在调整成藏过程中，气藏具有从超压向常压演变的特征。古气藏的破坏、侧向迁移和重新聚集成藏，可能主要受构造演化和构造高点的侧向迁移控制。

英文摘要：

The process of hydrocarbon accumulation can be revealed by the different minerals and fluid inclusions filled at different stages in the reservoirs.At least three generations of mineral filling can be identified in the Sinian Dengying Formation reservoir in the Gaoshiti structure of Central Sichuan. They are dolomite→bitumen→quartz/dolomite＋quartz.The early dolomite and later quartz are rich in oil inclusions and liquid CH4 inclusions,respectively.The trapping pressure （79.4-98.12 MPa） and the pressure coefficient （1.35-1.88）of CH4 inclusions in the quartz indicate that the ancient gas pools are characterized by overpressure.The pressure coefficient of the present gas pools is 1 .06-1 .1 3 .The research indicates that the Gaoshiti gas pool is characterized by multi-phase hydrocarbon accumulation and belongs to a tectonic adjustment gas pool.A possible process of hydrocarbon accumulation can be suggested as follows.（1）The ancient oil pool formed during Permian-the end of Triassic;（2 ） The petroleum thermal cracking in situ resulted in the development of ancient overpressure gas pools during Jurassic-Late Cretaceous;（3）The gas in the ancient gas pools migrated toward the Ziyang-Weiyuan and the ancient gas pools were destroyed in the early Himalaya period;（4）The gas from the Moxi ancient gas pools migrated to Gaoshiti structure and reformed new gas pools there in the middle-late Himalaya period.The pressure of gas pools decreased from overpressure to normal pressure during the adjustment and re-accumulation of hydrocarbon.The tectonic evolution and the lateral migration of the structural crest were responsible for the lateral migration and the destruction of the ancient gas pools and re-accumulation of hydrocarbon.