DIVISION OF PETROLEUM RESERVIOR-FORMING DYNAMIC SYSTEM: PRINCIPLE AND METHODS

Petroleum reservoir\|forming dynamic system, or refered to as petroleum reservoir\|forming system or migration\|accumulation system, is a relatively independent natural migration\|accumulation system within a petroleum system. In the study of petroleum reservoir\|forming system, division is very important, and a correct division is significant to petroleum exploration. In this paper, the division principle and methods of petroleum reservoir\|forming dynamic system are discussed, and it is considered that its division should be based on the similarity of migration\|accumulation conditions, dynamics and characteristics in different regions whin a petroleum system. Generally, petroleum reservoir\|forming dynamic system can be divided in light of as many as 11 methods, including those based on pressure system (over\|pressured, under\|pressured or normal pressured), genesis of accumulations (primary or secondary), migration style (lateral or vertical), driven force of migration, fluid potential, hydrocarbon phases, depositional facies, distance from source center, filling degree, or synthetic factors. In many cases, synthetic division is necessary. For example, the Kuche petroleum system can be divided into a normal pressured oil system in the north slope, normal\|overpressured oil\|gas system in the central foreland thrust belts and normal pressured condensate gas system in Luntai normal\|faulted belt and the normal\|overpressured oil\|gas system in the central foreland thrust belts can be subdivided into a normal secondary oil accumulation system above the Tertiary cap rocks and an overpressured primary gas accumulation system under it.