A STUDY ON THE SOURCE- RESERVOIR-SEAL ASSOCIATIONS AND MATCHING OF HYDROCARBON ACCUMULATION FACTORS IN THE FORELAND BASINS IN CENTRAL-WESTERN CHINA
中国中西部前陆盆地生储盖组合及成藏基本要素匹配分析

Structures in foreland basins form a specific geologic condition of hydrocarbon accumulation.The source-reservoir-seal associations are controlled by tectonic and sedimentary evolvement.Sedimentary series and source-reservoir-seal associations in the foreland basins in central-western China are various,affected by several times tectonization and the superposition of several types of original sedimentary basins.According to the sedimentary structure evolvement,three types of source-reservoir-seal associations are divided: Lower source-reservoir-seal associations,Middle source-reservoir-seal associations and Upper reservoir-seal associations.The type of self-generating and self-preserving reservoir is mainly in the Lower and Middle source-reservoir-seal associations,because of the superposed source-reservoir-seal rocks,and the Lower and Middle source-reservoir-seal associations have the best matching of space.The type of lower-generating and upper-reservoiring is mainly in the Upper reservoir-seal associations,as it has the best matching of hydrocarbon generation stage,sandstone diagenesis stage and effective sealing time.The Upper reservoir-seal associations have the best matching of time,where a large number of oil-gas pools have been discovered presently.