天然气地球科学 ›› 2020, Vol. 31 ›› Issue (6): 865876.doi: 10.11764/j.issn.1672-1926.2020.02.009
李奇1,2,3(),高树生3,4(),刘华勋3,4,叶礼友3,4,吴泓辉5,朱文卿3,4,张杰1,2,3,杨懿1,2,3,杨茂红6
Qi LI1,2,3(),Shu-sheng GAO3,4(),Hua-xun LIU3,4,Li-you YE3,4,Hong-hui WU5,Wen-qing ZHU3,4,Jie ZHANG1,2,3,Yi YANG1,2,3,Mao-hong YANG6
摘要:
致密砂岩气藏储层物性特征差异性较大,其不确定性严重制约气藏的稳产和高效开发。为有效开发致密砂岩气藏未动用储量,提高气田产量和采收率,对储层条件较为复杂的致密砂岩气藏进行井网密度优化是必要的。通过分析渗透率、孔隙度、有效厚度、含水饱和度、阈压梯度、产能系数和储容系数这7项储层物性参数对单井动态控制面积的影响,运用模糊数学方法,推理出井间无干扰时储层物性参数与单井动态控制面积的关系;并将计算所得的单井动态控制面积模糊预测值与地质井控面积对比,判断出不同储层物性条件下井网加密后井间是否会产生干扰,得到了随井网密度变化的干扰概率曲线,进而结合井间干扰概率构建了采收率评价模型,并在苏里格气田苏6区块开展应用。结果表明:使用新评价方法计算的致密砂岩气藏单井平均累计产气量及采收率,都与实际区块生产动态结果相一致,证明该方法是合理可靠的。采收率评价新方法为致密砂岩气藏井网优化提供了新思路。
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