基于微观模型模拟气体成藏过程中气水运动机理及分布规律

A Simulation Experimental Study on Gas-water Movement Mechanism and Distribution Regular in the Process of Gas Accumulation Based on the Microscopic Model

为了研究气体成藏过程中气水的微观运动机理及其分布规律,在微观玻璃模型上开展了0.1、1和10 MPa气驱水压力下气水渗流及分布的微观模拟实验。研究结果表明:对于同样条件的气藏,其原始含气、水饱和度的大小完全决定于成藏过程中成藏动力的大小;成藏动力越大,原始含水饱和度越低,含气饱和度越高;相反原始含水饱和度越高,含气饱和度越低。在较高的成藏动力作用下可以得到较大的原始含气饱和度,而且剩余水主要是束缚水,一般情况下在开发的过程中是不可动的,即气藏开发是单相气体渗流,开发难度小,采出程度高。

In order to study the gas water movement mechanism and distribution distribution of water-gas in the process of gas accumulation,micro glass model is used which conduct a simulation study of its characteristics under0. 5,1 and 10 MPa gas drive pressure. The results show that for the same conditions of gas reservoir,its original gas and water saturation completely depends on accumulation dynamics. The greater the accumulation dynamics is,the lower original water saturation is,and the higher the gas saturation is. On the contrary,the higher the original water saturation is,the lower the gas saturation. Larger initial gas saturation can be gotten under higher accumulation dynamics,the residual water is mainly bound water,and then it is immobile in the process of development under normal circumstances,namely gas is single-phase seepage,gas reservoir has high degree of extraction.