突变评价法在煤层气评价和选区中的应用

Application of Catastrophe Theory in Evaluation and Selection of Coal-Bed Gas Reservoirs

针对目前在煤层气选区评价方法上存在的问题,应用突变理论和模糊数学相结合的方法得到了突变模糊隶属函数,并由此建立了煤层气区块综合评价和选区模型。该模型首先建立了评价煤层气区块综合评价指标体系结构,并对指标参数进行了归一化处理;然后应用突变模糊隶属函数法,对煤层气区块进行了综合评价和筛选。该模型可避免模糊评价法、因子分析法和层次分析方法等的弱点,减少了主观性又不失科学性,对煤层气开发中的区块优选具有指导意义。

Considering the existing problems in evaluating the gas reservoir, a new assessment method was created based on the subordinate functions of assessment indexes which is obtained by using catastrophe theory and fuzzy mathematics. Evaluation index system for evaluating coal-bed gas reservoirs was created and then the index parameter was normalized. The subordinate function of assessment indexes was used to evaluate and select coal-bed gas reservoirs. This method can avoid the disadvantages associated with other assessment methods and provide reference for selecting coal-bed gas reservoirs.