本文指出了Magoon关于成熟烃源岩体个数划分含油气系统方法的局限性,以油气势能理论为依据,提出了一种以主要高势面划分含油气系统的新方法。剖面上,主要高势面多为区域性分布的烃源岩层、岩性致密层或成岩致密带;平面上,高势面即为油气分割槽,主要为盆地轴线或封闭性良好的大断裂带,将含油气系统进一步划分出多个亚含油气系统。 松辽盆地北部东区可划分为上、中、下三套含油气系统;平面上,下部含油气系统又可进一步划分出五个亚含油气系统。 This paper points out the limitations of Magoon’s method of dividing oil and gas systems by the number of mature source rocks. Based on the theory of potential energy of oil and gas, a new method of dividing oil and gas systems with major high potential is proposed. In the section, the main high-potential areas are mostly regional hydrocarbon source rocks, lithologic dense layers or diagenetic tight belts. On the plane, the high potential surface is the oil-gas dividing groove, mainly for the basin axis or a large closed fault , The oil and gas system is further divided into multiple sub-oil and gas systems. The eastern part of the northern Songliao Basin can be divided into upper, middle and lower sets of petroleum systems; the upper and lower petroleum systems of the Songliao Basin can be further divided into five sub-petroliferous systems.