The key idea of the paper for tracing is suggested to follow the vine to get the milon,that is the process-oriented study.The oil and gas migration and accumulation unit can be therefore defined.

• 本文主要讨论复合含油气系统的划分要注重油气运移流向研究,在定源前提下,以顺藤摸瓜的方式,确定油气运聚单元。