欠饱和页岩气藏物质平衡方程及储量计算方法  

Material Balance Equation and Reserves Calculation Method of Unsaturated Shale Gas Reservoirs

作　　者：赖令彬 潘婷婷 胡文瑞[3] 宋新民 冉启全 

机构地区：[1]中油勘探开发研究院,北京100083 [2]中油东方地球物理公司,河北涿州072751 [3]中国工程院,北京100088

出　　处：《特种油气藏》2014年第5期95-98,156,共4页Special Oil & Gas Reservoirs

基　　金：国家"863"计划"典型非常规油气藏数值模拟关键技术与软件开发"(2013AA064902)

摘　　要：针对页岩气藏特殊的储层特征及赋存状态,基于吸附气解吸原理,运用物质平衡理论、Bangham变形理论及Langmuir吸附模型,推导了欠饱和页岩气藏的物质平衡方程,并对物质平衡方程线性化,从而获得基于物质平衡方程的页岩气动态储量计算方法。研究表明:临界解吸压力对页岩气动态储量预测影响较大,考虑临界解吸压力页岩气动态储量比不考虑解吸压力动态储量低2%左右;临界解吸压力越小,储层欠饱和程度越高,吸附气含量越低,气藏动态储量越低;溶解气对动态储量影响相对较小,约占总储量的0.06%。Considering the special formation features and occurrence status of shale gas reservoirs,based on desorption principle of absorbed gas,material balance theory,Bangham deformation theory and Langmuir absorption model were used to derive the material balance equation of unsaturated shale gas reservoirs. Then,this material balance equation was linearized to obtain the algorithm for calculating dynamic reserves of shale gas. This study indicates that:( 1) critical desorption pressure has bigger influence on the prediction of dynamic reserves of shale gas,which is about 2% lower than that not considering desorption pressure;( 2) the smaller of critical desorption pressure,the higher of unsaturated level of reservoirs,the lower of adsorbed gas content,and the lower of dynamic gas reserves; and( 3) dissolved gas has smaller influence on dynamic gas reserves,about 0. 06% of the total gas reserves.

关 键 词：页岩气 物质平衡 吸附饱和度 欠饱和 储量计算 

分 类 号：TE328[石油与天然气工程—油气田开发工程]