等效排烃压力及其在东营凹陷油气勘探中的应用

应用含油体系和成藏动力学理论 ,对油气初次运移中驱动油气从烃源岩进入岩性圈闭的动力条件进行定性或半定量解释 ,研究了初次运移过程中砂岩透镜体对于油气进入圈闭的阻力作用。引入等效排烃压力的概念 ,提出了评价岩性圈闭成藏阻力条件的方法 ,并对东营凹陷的两个砂岩透镜体实例进行了评价。实例分析表明 ,等效排烃压力的确是评价砂岩透镜体成藏阻力的有效参数 ,可将它与流体封存箱相结合作为岩性圈闭成藏定量评价的依据

EQUIVALENT CHARGING PRESSURE AND ITS APPLICATION TO OIL AND GAS EXPLORATION IN DONGYING DEPRESSION

Based on the principle of petroleum system and dynamics of pool formation, the dynamical conditions, on which oil and gas get into lithological traps from hydrocarbon resource rocks at primary migration, are qualitatively or semi\|quantitatively explained. The resistance upon oil and gas as they get into sand body at first migration are studied. A new conception, equivalent charging pressure, are presented, and a method for evaluating resistance conditions for pool formation of lithological traps is offered. Analyses of two lentoid sand bodies in Dongying Depression show that equivalent charging pressure is an effective parameter to evaluate resistance pool formation of lithological traps. Combined with pressured fluid compartment, the equivalent charging pressure will be the basis of quantitative evaluation for lithological traps.