火山岩凝析气藏物质平衡方程及应用

Study and application of material balance equation in volcanic gas condensate reservoir

运用物质平衡方法准确计算火山岩凝析气藏的动态储量,有助于编制气藏开发方案。采用理论研究结合实验数据检验的方法,从物质守恒原理入手,考虑底水侵入、基质和裂缝双孔隙储集结构等因素的影响,推导了具有火山岩凝析气藏储层特征的物质平衡方程。采用全直径岩心进行了凝析气藏衰竭模拟实验,运用实验数据对推导的火山岩凝析气藏物质平衡方程进行了检验计算,结果表明运用该方程计算的岩心储气量与实验开始前岩心饱和的凝析气量偏差极小,能够准确计算火山岩凝析气藏的动态储量。应用该方程计算新疆滴西气田滴西44区块的凝析气储量为215.424×108m3。

The use of volcanic material balance method may calculate the dynamic gas condensate reserves accurately,and provide the basis for the preparation of development plan for volcanic gas condensate reservoir.Based on the theoretical and experiment test,as well as the material balance theory,and after considering the bottom water invasion and matrix and fracture storage structure,the material balance equation characterizing the volcanic condensate reservoir is deduced.Then,the condensate gas reservoir depletion simulation is carried out on the whole diameter core,and the material balance equation is verified by the experiment and simulation data,the results show that the error between the calculation of gas within the core by the equation is almost identical to the experiment,and may be applied reliably for the dynamic reserve estimation of volcanic reservoir.Applying this equation,the reserve of Dixi44 block of Dixi gas field is estimated to be 215.424xl08 m3.