高河井田煤层气排采因素分析

Drainage Factors of Coal Bed Methane in Gaohe Coal Field

高河井田煤层气在相同地质条件下排采情况差异性明显,以井田内部分煤层气井产气量资料为基础,分析了高河井田不同井组产气特征,并分析了影响煤层气产量的地质因素和工程因素。结果表明:井田内3#煤层厚度大,埋深适中,煤级以瘦贫为主,是良好的气源岩,但其渗透率低,区内张性构造发育,局部含气量低,是不利储层,因此,在不同构造位置应考虑不同的工程方案。

In spite of the same geological conditions,there is a significant difference in coalbed methane（CBM）drainage in Gaohe coal field.Based on the gas production data of some CBM wells,we analyzed the gas production characteristics of different well groups in Gaohe coal field as well as the geological and engineering factors which affect the CBM production.The results show that the No.3 coal seam,with large thickness,moderate burial depth,and mainly meager lean coal,is good source rock.However,it is unfavorable reservoir because of low permeability,extensional structure,and low gas content.Therefore,different engineering schemes should be considered for the different tectonic positions.