An Experiment on Physically Simulating Secondary Oil Migration and Analysis of Dissipating Features
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摘要: 石油二次运移是一个复杂的地质过程,本文通过利用饱和地层水的低孔低渗储层砂岩来进行石油二次运移模拟实验,初步研究了此过程的变化特征。研究表明 :在静水条件下,石油水平运移带的平均含油饱和度达 15 %~2 5 %。运移过程中饱和烃、芳烃及非烃与含油饱和度呈正相关性。在运载层物性相差较小的情况下,运移驱动力是运移效率的主导因素。在孔渗性好的运载层,含油饱和度容易达到稳定。Abstract: Secondary petroleum migration is a complex geological phenomenon. This paper primarily discusses the changeable features of the process through the modelling experiment of secondary migration using the reservoir sandstone with ultra-low porosity and permeability. The experimental results indicate the average oiliness saturation in a horizontal migrating zone is 15%～25% under a hydrostatic condition, and the migrating efficiency is better. During migration, saturated , aromatic and non-hydrocarbons have a good relation with oiliness saturation. Driving power of secondary petroleum migration is a critical factor that controls migrating efficiency when the difference in conduits is very little. Oiliness saturation can be easily obtained in the conduits with good porosity and permeability.
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