气藏数值模拟及在松南地区的应用

Numerical modeling of gas reservoirs and its application in Songnan region

1. 吉林大学地球探测与信息技术学院,长春130026;2. 吉林大学环境工程学院,长春130026;3. 中国石化石油勘探开发研究院南京石油物探研究所,南京210014

Earth Exploration and Information Technology College, Jilin University, Changchun 130026

对气藏数值模拟方法进行了综合研究,建立了在均质、裂缝—孔隙介质条件下的气藏数值模拟的数学模型,给出了初始条件和边界条件;通过对方程的线性化处理,使方程得到简化,进而可以利用有限差分方法求解。以松南地区后五家户气田为例进行了该气田的数值模拟研究,并对其开发动态、生产情况、开发指标从数值模拟角度进行分析,发现后五家户气田为低渗透气田,其渗透率在平面上非均质性很强,这就形成气层压力在平面上传导出现滞后现象。此外,还比较合理的确定单井配产、采气速度、稳产年限、井网、井距等开发指标,初步应用取得了一定的效果。

This paper discussed thoroughly on the numerical modeling of gas reservoirs, established a mathematical model for gas reservoir modeling under conditions of homogeneous, fracture-pore media and derived the initial and boundary conditions for the model. Equations are simplified by linearization and solved with finite difference scheme. The numerical modeling performed at Houwujiahu gas field in Songnan region shows that the gas field is a low permeable gas field with areally high inhomogeneous permeability. This is the reason for the pressure transmission lagging of the gas-bearing formations in plane. The reasonable development indices such as proration, gas productivity, stable production period, well pattern, and well spacing are also determined which yields satisfactory results in the preliminary applications.