摘要
以质量守恒为基础,建立了考虑地层吸附相密度的封闭性页岩气藏物质平衡方程,解决了吸附相在地下所占据的体积问题,以及采出天然气中吸附气和自由气的比例问题。实例计算结果表明,常规封闭气藏物质平衡方程由于没有考虑吸附气存在,计算所得储量偏小。王德龙物质平衡方程由于没有考虑吸附气解析后是要和自由气一起采出的,计算所得储量略微偏大。考虑吸附相密度的页岩气物质平衡方程将解吸气和自由气以整体形式考虑,计算所得储量更接近实际情况,拟合度也更高,随着吸附相密度的增加,气体总储量以及吸附气储量逐渐减少,自由气储量逐渐增加。
Based on the conservation of mass,the material balance equation of closed shale gas reservoir considering the density of the adsorbed phase is established,thus the problem of the adsorbed phase undergroun2d volume is solved,and furthermore the ratio between the adsorbed gas and free gas in the produced gas is made clear.The calculated results of the example show that the calculated reserves are smaller by the conventional gas reservoir material balance equation without considering the adsorbed gas.Due to Wang Delong＇s material balance equation without considering the desorption gas of the absorbed gas and produced with the free gas at the same time,the calculated reserves are a little larger.Because of the material balance equation considering the desorbed gas and free gas as a whole and furthermore the density of the adsorbed phase,the calculated reserves are closer to the actual value and moreover the fitted degree is more pretty higher.Along with the increase of the density of the adsorbed phase,the total gas reserves and adsorbed gas reserves are reduced,on the contrary,the free gas reserves are increased gradually.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2015年第3期166-169,共4页
Petroleum Geology & Oilfield Development in Daqing
基金
大型油气田及煤层气开发国家科技重大专项(2011ZX05024-002-004)资助
关键词
页岩气
物质平衡方程
吸附相密度
储量
shale gas
material balance equation
adsorbed phase density
reserve
