低渗透砂岩气藏开发指标数值模拟预测

NUMERICAL SIMULATION PREDICTION OF THE DEVELOPMENTAL INDICES OF LOW PERMEABLE SANDSTONE GAS RESERVOIR

以苏里格气田苏14区为研究对象,采用随机地质建模和数值模拟技术,建立气藏精细地质模型并进行数值计算,对低渗透砂岩气藏不同井网井距下的开发指标进行预测。计算结果表明:针对苏里格型砂体规模较小、储量丰度低的低渗透砂岩气藏,800m×600m井网为最优井网,可以实现单井累计采气量和区块生产井数最大化;在800m×600m井网、区块整体稳产10年的情况下,单井最终采出量为2160×104m3,稳产期采收率为12.90%,气田最终采收率为29.76%。

Geological modeling of Su14 block has been carried out and the developmental indices of different well patterns have been predicted by using the techniques of stochastic modeling and numerical simulation.Results show that the well pattern of 800 m × 600 m is the optimized one to this kind of small scale and low abundant gas reservoir.With the optimized well pattern,the accumulative gas production of individual well and the total number of productive wells are maximized.With the well pattern of 800 m × 600 m,the developmental indices are predicted.During the 10 years' stable production period,the accumulative production rate of individual well will be 2 160 × 104 m3 and the periodical and ultimate recovery rate will be 12.90% and 29.76% separately.