基于TOPSIS法的煤层气储层综合评价

Comprehensive Evaluation of Methane Reservoirs Based on TOPSIS

煤层气是一种形成于煤层又储集于煤层中的非常规天然气,有效地开发利用煤层气对充分利用能源和改善我国能源结构具有极为重要的意义。本次研究针对沁端区块3#储层受多种地质条件影响这一问题,选取煤层气含量、煤层厚度、煤层埋深、煤层温度、煤层压力、灰分含量、煤密度、煤的镜质体反射率等8个参数,运用熵权逼近理想排序法(TOPSIS法)进行了煤层气储层综合评价。研究结果表明,TOPSIS法计算简便、权重的确定受主观因素影响小,评价结果与储层特征相符,为煤层气储层的综合评价提供了一种新的方法、途径。

Methane is an unconventional gas which formed and accumulated in coal seams. The effective development and utilization of methane is very important to make full use of energy and improve the energy structure in China. This study focused on the No. 3 seam of the Qinduan block which is influenced by many geological conditions. Eight parameters,which are the content of methane,coal thickness,buried depth of coal seam,temperature,pressure of coal seam,ash content of coal seam,density of coal,and coal vitrinite reflectance have been taken as main indexes to be considered. The methane reservoir has been evaluated comprehensively based on the method of TOPSIS. The results indicate that the method TOPSIS is a simple in calculation and easy in operation,and its weight determination is less affected by subjective factors. The evaluation results are in conformity with reservoir characteristics. Thus it is a new approach for evaluation of gas reservoirs in seams.