一种新型饱和型煤层气藏物质平衡方程  

A new material balance equation for saturated coalbed methane reservoir

作　　者：周育瑞 郭立强[1] 常玉丽[1] 周国晓 徐亚飞[1] 孙舒敏 杨龙[1] 朱浩然 ZHOU Yurui;GUO Liqiang;CHANG Yuli;ZHOU Guoxiao;XU Yafei;SUN Shumin;YANG Long;ZHU Haoran(Exploration and Development Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang 457001,China;Research Institute of Petroleum Exploration and Development,Changqing Oilfield Company,PetroChina,Xi′an 710018,China)

机构地区：[1]中国石化中原油田分公司勘探开发研究院,河南濮阳457001 [2]中国石油长庆油田分公司勘探开发研究院,陕西西安710018

出　　处：《断块油气田》2024年第4期691-697,共7页Fault-Block Oil & Gas Field

基　　金：中石化科技部集团公司项目“普光侏罗系陆相页岩凝析气藏有效开发技术”(P23202)。

摘　　要：对于临界解吸压力与原始地层压力相等的饱和型煤层气藏,King提出的经典物质平衡方程在实际应用中还存在一些不足,其未考虑吸附相所占据的孔隙空间。Ambrose修正了自由气体孔隙体积,建立了一种新的物质平衡方程,在实际中得到了有效应用。在King和Ambrose的基础上,文中首次同时考虑了吸附相视孔隙度、吸附相体积随压力变化及吸附相密度等因素,为饱和型煤层气藏储量计算提供了一种新方法。实例分析表明,考虑吸附相视孔隙度后,吸附气储量的计算值增加了59.92%,游离气储量减少了82.33%,计算得到的总储量增加了31.08%,新方程计算所得的总储量更接近容积法计算的储量。For saturated CBM reservoirs where the critical desorption pressure is equal to the original formation pressure,the classical material balance equation proposed by King still has some shortcomings in practical application,as it has not considered the pore space occupied by adsorbed phase.Ambrose modified the free gas pore volume and established a new material balance equation,which has been effectively applied in practice.On the basis of King and Ambrose,adsorbed phase apparent porosity,adsorbed phase volume change with pressure and adsorbed phase density are considered simultaneously for the first time in this paper,which provides a new method for the calculation of saturated CBM reserves.As indicated by the comparative analysis of examples,considering the adsorbed phase porosity,the calculated value of adsorbed gas reserves increases by 59.92%,the free gas reserves decreases by 82.33%,and the calculated total reserves increases by 31.08%.The total reserves calculated by the new equation are closer to the reserves calculated by the volume method.

关 键 词：吸附相视孔隙度 吸附相体积 煤层气 物质平衡方程 储量计算 

分 类 号：TE155[石油与天然气工程—油气勘探]