张性断层系统中石油运移数值模拟研究

Numerical modeling of oil migration in an open-fracture fault system

目前对于石油在张性断层系统中的运移问题,除了通过岩芯和野外露头研究外,更多的是通过物理模拟来研究,而采用数值模拟方法来研究该问题则很少.基于前人在张性断层系统中石油运移过程的物理模拟结果,采用多相流数值模拟软件TOUGH2,建立了该张性断层系统中水-气-油三相流的二维剖面数值模型.结果表明,TOUGH2软件可以用来模拟和分析石油在张性断层系统中的运移规律及分布特征,与物理模拟相比,基于TOUGH2软件的数值模拟具有成本低廉、操作灵活等特点,适用于各种复杂条件下水—气—油三相流的运移模拟.

In addition to litho geochemical investigation of rock outcrops and core samples by drilling, more physical analog experiments were often used to analyze or simulate the migration of oil in the open fracture fault systems, while numerical simulation methods are rarely applied to address these issues. In this study, the multiphase flow numerical simulation software TOUGH2 is used to build a two-dimensional numerical model of a cross sectional profile for modeling two phase flow of water oil in the open fracture fault system, based on the results of the previous physical analog experiments of the migration of oil in the open fracture fault system. The modeling results show the TOUGH2 can be used to characterize the migration and distribution of oil in the open-fracture fault system. Moreover,compared with physical analog experiments, numerical simulation methods such as TOUGH2 are cost effective and operation flexible and can be applicable to modeling three phase flow of water gas oil under a variety of complex conditions.