为了正确模拟复杂孔、洞、缝三重介质碳酸盐岩凝析气藏的开发动态,在前人研究的基础上,提出了一种适合于该类凝析气藏的等效数值模拟方法。通过单个岩块概念模型,以含孔、洞、缝三重介质的等效单重介质精细模型计算结果为正确结果,以孔、洞所属的岩块系统气采出程度为主要对比指标,建立拟相渗和拟毛管力曲线,对比分析了气藏有水和无水两种情况下不同模型计算结果。结果表明,对于三重介质无水凝析气藏,直接采用双重介质模型可正确等效模拟;对于有水情况,需首先通过单个岩块概念模型模拟建立起拟相渗和毛管压力曲线,然后应用采用拟曲线的双重介质模型可正确等效模拟。
A new equivalent simulation method based on previous studies has been proposed to simulate and pre- dict the production performance of carbonate condensate gas reservoir with triple media composed of pore, cavity and fracture. Pseudo-relative permeability and pseudo-capillary pressure curves have been generated through the conceptual model of single rock mass, taking the calculation result of equivalent single-media fine model that con- tains triple media of pore, cavity and fracture as the correct result and gas recovery degree of rock mass with pore and/or cavity as main correlation index, comparing and analyzing the calculation results of two different models of the gas reservoir with or without the existence of water. Resuhs show that dual-media model can be applied directly to accurately and equivalently simulate triple-media condensate gas reservoir without water, and for condensate gas reservoir with water, pseudo-relative permeability and pseudo-capillary pressure curves ought to be generated by conceptual model of single rock mass firstly, and then equivalent simulation can be realized by dual-media model build by the pseudo-curves.