油气二次运移数值模拟分析

Numerical simulation analysis of secondary hydrocarbon migration

周波 金之钧 王毅

Zhou Bo Jin Zhijun Wang Yi

通过分析物理实验和数学模拟认为,油气运移的模式是多样化的。实际地质条件的油气运移模式有3种:稳定式、指进式和优势式。不同运移模式的运移规律并不相同,用任何一种单一的油气运移数值模拟方法来描述所有的油气运移模式是不科学的。不同的运移模式对应着不同的数值模拟方法,其中逾渗方法适用于描述指进式运移和优势式运移过程,达西渗流方程适用于描述稳定式运移模式。流体势的方法同时可以用于分析3种模式下的运移,但其模拟结果只是一种定性结果。此外,数学模拟必须以详实的地质资料为基础,结合油气显示和地化资料,综合分析油气运移过程,才能确定真正的油气运移过程。

The analysis of the physical experiment and numerical simulation results shows various oil migration modes.There are three modes of oil migration under actual geological conditions:stable mode,fingering mode, and spring mode.Different migration modes have different patterns of migration,thus using single numerical simulation method to simulate all the modes is not very scientific.Therefore,different migration modes shall be described with different numerical simulation methods.Invasion percolation method is suitable for the description of the fingering mode and the spring mode,while the Darcy equation is applicable for the stable mode.The fluid potential method can be applied to all the three modes,but its results are qualitative.In order to determine the real oil migration process ,the mathematical simulation shall be based on detailed geological data,oil and gas shows and geochemical data.

10.11743/ogg20080417