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油气系统（ＰｅｔｒｏｌｅｕｍＳｙｓｔｅｍ）是９０年代石油地质学的重要进展，但在多旋回构造变动区，国外盛行的油气系统定义及成因分类法多不适用，必须修正，应该考虑多期成藏、晚期成藏、纵向混源等特点。根据中国南方海相地层发育区的多旋回构造变动特点，创立了油气系统的历史—成因分类法，既要从成因角度划分原型盆地的油气系统，也要从历史演化角度分析油气系统形成后的动态变化，最后根据实际区域地质特点确定出可操作的油气系统类型。并以中国南方志留系—石炭系油气系统为例说明之。
Petroleum System was an important advance in petroleum geology in the 1990s. However, in the multi-cycle structural variation area, the petroleum system definition and genesis classification that are prevalent in foreign countries are not applicable and must be amended. Multi-period hydrocarbon accumulation, late hydrocarbon accumulation , Vertical mixed source and so on. According to the characteristics of multi-cycle tectonic movements in the marine stratigraphic development zones in southern China, a historical-genesis taxonomy of petroleum systems has been established. It is necessary to classify the petroleum systems of the prototype basins from a genetic point of view and to analyze the evolution of petroleum systems after their formation Dynamic changes, finally according to the actual regional geological characteristics to determine the type of oil and gas system can be operated. And taking the Silurian-Carboniferous hydrocarbon system in southern China as an example.