煤层气上市储量评估方法研究

Research on Evaluation Methods for Coalbed Methane Listed Reserves

通过对沁水盆地、鄂尔多斯盆地的典型七个煤层气区块进行分类分析总结,建立了一套适用于煤层气藏上市储量评估的方法。研究表明:根据生产阶段确定评估方法较为适宜,将七个煤层气田分成了三种类型:处在递减阶段的成熟区块,采用动态递减法进行评估;处在上产阶段的区块,采用体积法进行评估;既有上产井又有递减或稳产井的区块,采用基于典型曲线法的动静结合的方法进行评估。采用上述评估方法取得的评估结果与美国第三方评估公司Ryderscott公司评估结果误差较小,说明该方法较为合理可靠。

This paper establishes a set of evaluation methods suitable for listed coalbed methane reserves by classifying and summarizing 7 typical coalbed methane blocks in Qinshui Basin and Erdos Basin.The study shows that it is more suitable to determine the evaluation method according to the production stage,and 7 coalbed methane fields are divided into three types:mature blocks in the later stage of production which can use the dynamic decline method;blocks in the production upswing stage which can use the volume method;blocks in the stage with a production phase of both rising and fall,which can use dynamic and volume method(based on typical curve).There is little deviation between the evaluation results obtained by using the above evaluation method and those obtained by Ryderscott,who is a third-party evaluation company in the United States,which indicates that this method is reasonable and reliable.