The general materialbalanceequation was applied widely in the field, but few studies about materialbalanceequationof gas injection flooding has been conducted.
常规物质平衡方程在油田已广泛应用，然而对油田注气物质平衡方程的研究较少。
2
When calculating with materialbalanceequation, the accuracy of the calculation result is often affected by the error of PVT parameters.
采用物质平衡方程计算时，常常由于PVT参数的误差而影响最终计算结果的精度。
3
Large deviation will appear if materialbalanceequationof the gas reservoir for calculating OIP is used directly in this production scheme.