【摘要】 为提高高丰度煤层气富集区的评判精度,优化评判方式,增强评价体系的客观规律性和可移植性,本文从煤层气赋存地质条件出发对影响煤层气富集区的成藏机理进行研究,确定以含气量、煤层厚度、裂隙密度、上覆地层压力作为高丰度煤层气富集区评判的4个层次因素(评判指标).选择具有代表性和典型性的沁水盆地寺河矿区某块段为研究区,以该区三维地震数据体为基础,提取出作为高丰度煤层气富集区评判的4个指标.利用改进的层次分析法计算出各指标的权重,采用加权平均模型建立了高丰度煤层气富集区模糊综合评判体系.研究区实地调查的煤层气井的日产气量表明:评判结果与实际情况吻合较好.分析认为:将改进的层次分析法应用在高丰度煤层气富集区的地球物理识别中能定量展示高丰度煤层气富集区的精确位置和量值大小,预测结果可靠,具有良好的适用性和移植性.更多还原

【Abstract】 In order to improve the precision of assessment in high abundance of coalbed methane-rich region,optimize the evaluation mode and perfect the portability and objective laws of evaluation system, this paper studied the accumulation mechanism of coalbed methane-rich region through the geological conditions of coalbed methane deposit,and selected gas content,coal seam thickness,fracture density,and overburden pressure as 4 level factors to evaluate high abundance of coalbed methane-rich region.Took a block of Sihe mine in Qinshui basin as representative and typical research area,the 4 factors were extracted from 3D seismic data volume in this area.Using the improved AHP weights to calculate each index weights,the weighted average model is adopted to establish a fuzzy comprehensive evaluation system in high abundance of coalbed methane-rich region.Tested by field investigation daily gas production of coalbed methane drilling,the results showed the evaluation results are in good agreement with the actual situation.In a word,applied the improved AHP in geophysics recognition in high abundance of coalbed methanerich region can quantitatively demonstrate the precise location and magnitude of the size of high abundance of coalbed methane-rich region,its evaluation is accurate and reliable,and has good applicability and portability.更多还原