熵权分析法在地下储气库设计中的应用

Application of entropy weight analysis method in the design of underground gas storage

针对地下储气库设计方案优选涉及因素较多的问题,提出基于层次分析法(AHP)和熵权法确定最佳设计方案。采用层次分析法和信息熵方法相结合的组合赋权法确定垫层气量、注气结束时的最大地层压力、注采井数、压气站功率、工程投资和使用寿命等6个评价指标的综合权重,结合层次分析法对各个设计方案与理想解逼近程度的计算,实现方案优劣排序。实例计算结果表明:两种方法结合使用能够同时兼顾主观因素和客观因素的影响,为设计者选择技术上可行、经济上合理的设计方案提供了有效方法,并为优化地下储气库生产运行参数提供辅助决策。

In view of the underground gas storage design plan involving many factors, the authors suggest to determine an optimal design plan based on the analytic hierarchy process (AHP) and entropy weight method. Combination weighting method subject to combination of the analytic hierarchy process and information entropy method is used to determine comprehensive weight of six evaluation indicators such as cushion gas volume, maximum formation pressure at the end of gas injection, number of injection and production wells, gas compression station power, project investment, service life and so on and calculations of the analytic hierarchy process on design plans and ideal solution similarity are combined to achieve superiority and inferiority ranking of plans. Calculation results of cases show that the combination of both methods can take impacts of both subjective and objective factors into consideration, give an effective method for a designer to select a technically feasible and economically reasonable design plan and provide aided decision making to the optimization of production and operating parameters of the underground gas storage.