油气初次运移的控制因素与排烃效率

On the Factors Controlling the Primary Migration and the Expulsive Efficiency

通过对油气初次运移控制因素与排烃效率关系的分析,找出影响排烃效率的5个主要支配变量,即孔隙损失率、有机质含量、地温梯度、生油岩埋藏时间、生储层搭配模式,由此推导出排烃效率的定量表达式,计算出不同地质变量值的排烃效率,并得出以下结论:①排烃效率随有机碳含量的升高而增大;②排烃效率随地温梯度的升高而增大,但达到一个最大值后,地温梯度升高,排烃效率反而降低;③非均衡压实时,低地温梯度有利于烃的排出,但均衡压实时,高地温梯度有利于烃的排出;④生油岩埋藏时间越长,排烃效率也越高。

By analysis for the relationship between the factors controlling primary migration and the expulsive efficiency, 5 variables affecting the expulsive efficiency have been obtained, which are pore loss ratio, content of organic carbon, geothermal gradient, buried time of source rock and matching pattern of source rock and reservoir, from which the quantative expression has been derived. After that, the values of expulsive efficiency are calculated. The results indicate that the expulsive efficiency varies directly as the content of organic carbon and as the geothermal gradient, but it decreases after getting maximum, and that expulsive efficiency in non-balanced compaction is higher than that in balanced compaction, and that the ronger burial time of the source rock, the higher the expulsive efficiency.