动态龟背图法计算气藏单井控制地质储量

The Dynamic Turtle-Back Diagram Used in Calculating the Single-well Control Geological Reserves

气藏开发进入中后期经常需要对现有井网开发效果进行评价,评价过程中需要对单井控制储量进行准确计算。利用容积法计算气藏单井控制地质储量的过程中,传统的单井控制面积的确定方法如算术平均法和泰森多边形(Voronoi)图法等忽略了储层非均质性及气藏开发压力传递特征等影响到单井控制地质储量计算结果的重要因素。首先借助气藏试井、动态监测及生产数据等动态资料,计算出单井动态储量,将单井动态法储量作为该井对井区单井控制面积的控制能力因素融入到龟背图的绘制过程。这一新的控制面积确定方法表明:动态龟背图法计算气藏单井控制地质储量是在传统的龟背图法的基础上,借助单井动态资料对单井控制面积的计算方法进行修正,由此得到的计算结果更为合理。

In the middle and late stage of gas reservoir development,it is often necessary to evaluate the development effect of existing well pattern.In the process of calculating the single well control geological reserves with volume method,the traditional methods to determine the control area of a single well,including arithmetic average method and Voronoi diagram method,etc.,ignore much important information such as the heterogeneity of the reservoir and pressure transmission characteristics.In this study,the single well dynamic reserves were first calculated by using the dynamic data such as gas well test,dynamic monitoring and production data,which were incorporated into the drawing process of the turtle-back map as the control power factor of the well.The new control area determination method shows that the dynamic turtle-back chart method is more reasonable,which is modified by using the dynamic data of single well,based on the traditional turtle-back chart method.