煤层气井排采历史地质分析

根据晋城、潞安、焦作、铁法4个矿区25口煤层气生产试验井的排采资料,从煤储层渗透性和含气饱和度、生产压降条件、地下水系统、储层能量系统等方面综合分析研究,将排采曲线归纳为4种具有代表性的类型。认为煤储层渗透率0．5mD以上、临储压力比0．6以上以及含气饱和度80％以上,是获得高产煤层气井的必要储层条件。同时,煤储层和围岩的不同组合。将直接影响煤层气井的生产状况。

Geological Analysis of Production History in Coalbed Methane Wells

Production data of 25 coalbed methane wells of Jincheng, Lu'an, Jiaozuo and Tiefa coalfields are used in a comprehensive study on permeability, gas saturation, condition of reservoir pressure drop-off, underground water system and energy system of coalbed methane reservoir. Four types of typical production curve in coalbed methane wells are recognized. The author believe that necessary reservoir conductions of high production coalbed methane well are high permeability (>0.5 mD), high specific value of critical desorption pressure and reservoir pressure (> 0.6) and high gas saturation ( > 80 %). Variable combination between coal seam and stratum may control directly coalbed methane production.