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自晚期生油说确立以来,排烃就成为油气地质研究和油气资源量评价中最突出的难点.本文吸取前人已有的研究成果,以独立相作为排烃的主要相态,建立一个二维(剖面)双开关排烃模型.即认为孔隙流体压力达到破裂压力值且含油饱和度超过临界值时,开始排烃,直到压力降到一定限值使裂缝闭合为止.就某一有效烃源岩而言,可以发生一次或多次排烃过程.应用该模型研究辽东湾地区的排烃,取得了良好效果.
Hydrocarbon expulsion has become the most prominent difficulty in oil and gas geology research and oil and gas resource assessment since the oil generation was established in the late stage.On the basis of previous research results of this paper, independent phase is taken as the main phase of hydrocarbon expulsion and a second (Cross-section) double-switch model of hydrocarbon expulsion.It is considered that when the pore fluid pressure reaches the rupture pressure value and the oil saturation exceeds the critical value, the hydrocarbon expulsion starts until the pressure drops to a certain limit so that the fracture is closed. One or more hydrocarbon expulsion processes can occur in the rocks, and the hydrocarbon expulsion in the Liaodong Bay area has been studied using this model with good results.