考虑水侵影响的礁滩气藏动态储量预测模型

Dynamic reserves prediction model of reef gas reservoir considering effects of water invasion

田冷 2 王猛 2 申智强 2 潘少杰 2 白耀星 2 王文举 2

（1．中国石油大学（北京）石油工程教育部重点实验室，北京 102249 2．中国石油大学（北京）石油工程学院，北京 102249）

MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China)

礁滩气藏储层非均质性强，气水关系复杂，受水侵影响严重，常用动态储量计算方法无法解决储量的准确预测问题。结合礁滩气藏的地质特点，讨论了水侵礁滩气藏动态储量的影响因素，在稳定水侵和非稳定水侵识别的基础上，分析了气藏的水侵动态，基于水侵量和水侵系数2个重要水侵动态特征参数的研究，建立了水侵礁滩气藏动态储量预测模型，并针对平面径向流、直线流、半球形流等3种水侵模型，采用Laplace算法，对系统不同时间的水侵量进行了计算，进而求解出水侵气藏动态储量。实例计算结果表明，与其他方法相比，新模型可准确预测礁滩气藏动态储量，指导礁滩气藏的开发。

With the influence of strong reservoir heterogeneity, complex gas-water relationship and serious water invasion, it is hard to predict reservoir dynamic reserves accurately by using common calculation method. This paper provides a new method to improve the accuracy of the prediction. First, based on the geological characteristics of reef gas reservoir, this paper studies the influence factor and the dynamic performance of water invasion in stable and unsteady water influx gas reservoir. Then the dynamic reserves prediction model containing two important water invasion dynamic characteristic parameters is established. Finally, for the three kinds of water flow patterns, the plane radial flow, the linear flow and the hemispherical flow, the water influx volumes are calculated with Laplace algorithm and the dynamic reserve volume of gas reservoir water influx are worked out. Compared with the traditional methods, the new model can accurately predict the dynamic reserves and then guide the development of reef flat gas reservoir.

10.6056/dkyqt201701006