中国陆相复杂含油气系统的特征

CHARACTERISTICS OF NONMARINE COMPLEX PETROLEUM SYSTEM IN CHINA

含油气系统研究是当今石油地质界最为热门的研究课题之一 ,在油气勘探中日愈发挥重要作用。在中国陆相多旋回复合叠加型盆地背景下的含油气系统多表现为复杂的多源多灶多期生烃和成藏。这种复杂的含油气系统有 3个较突出的特点 :1多源多灶导致系统叠置和交叉 ;2多阶段多期生烃、成藏和变动导致多源混生 ;3多个关键时刻。在复杂含油气系统的演化过程中 ,常有多期大规模的油气运移过程 ,因此 ,在研究过程中要重视过程的恢复。文章最后以准噶尔盆地玛湖 -盆 1井西复合含油气系统为例具体阐述了复杂含油气系统的特征。

The study of petroleum system forms one the hot subjects in petroleum geology,and plays an important role in oil/gas exploration.The petroleum systems in nonmarine multi cycle composite basins in China shows much complexity with multiple sources,multiple kitchens,multistage hydrocarbon generation and pooling.Such complex petroleum system has three obvious features: ① superimposition and interlacing one after another of the system as a result of multiple sources and multiple kitchens;②mixed oil generation arising from multistage hydrocarbon generation and pooling;③multiple critical time.Repeated large scale oil/gas migration would usually have occurred in the process of evolution of the complex petroleum system,so it is necessary to take into consideration their restoration.Finally,the paper discusses the characteristics of the complex petroleum system in particular,citing the Mahu penyijingxi complex petroleum system of junggar basin as an example.