关键词: 复合含油气系统, 叠合盆地, 流体交换, 勘探技术, 中国

Abstract: The composite petroliferous basin in China has long period of geological evolution history,multiple depositional sequences and intensive tectonic deformation. The petroleum system developed in this type of basin has some complex characteristics. One petroleum system commonly comprises several source layers or source kitchens,and experienced multiple periods of hydrocarbon generation,migration,accumulation and adjustment;hence the forming of hydrocarbon reservoirs might have several critical moments. Moreover, hydrocarbon fluid exchange often occur among systems through common migration paths,such as fault,unconformity,fissures created by over-pressured fluid,and lapped sand body,so that several source kitchens may charge a single reservoir. In accordance with the above complexity of the petroleum system in China,this paper introduced the concept of multi-source petroleum system, as well as its major characteristics, description methods and exploration techniques. A proposed research procedure starts with the description of the source kitchen,then following the nature process of hydrocarbon generation,migration and accumulation,focuses on the study of characteristics of geological elements and their combination at the critical moment, and the space of hydrocarbon migration and accumulation. The analyses of fluid migration history,basin simulation and the other modern exploration techniques played an important role in the description and evaluation of a multi-source petroleum system.

Key words: multi-source petroleum system, composite basin, fluid exchange, exploration technique, China