天荣井田二1-1号煤层气储层物性及特征

Physical Properties and Characteristics of the No.21-1 Coalbed Methane Reservoir in Tianrong Well-field System

煤层气储层物性及特征是煤层气地质理论的重要内容,是影响煤层气开发成效的关键因素。基于天荣井田煤层气勘探资料、相关测试数据及基础地质资料,采用煤层气地质理论对井田内二1-1号煤层气储层物性及特征进行了研究。结果表明:天荣井田二1-1号煤层厚度大且分布稳定、煤岩特性良好;煤储层压力状态分异显著,欠压-高压均有分布;煤变质程度较高,促使了煤层生烃,煤层气吸附储集能力强、吸附量大、煤层气含量高;煤层渗透性极差,煤层气解吸速率相对偏低,不利于煤层气高产、稳产、提高采收率,开发周期延长。

The physical properties and characteristics of coalbed methane(CBM)reservoir are the important contents of CBM geological theory and the key factors affecting CBM development efficiency.Based on CBM exploration data,related test data and basic geological data in Tianrong mine field,the physical properties and characteristics of the No.21-1 CBM reservoir in Tianrong mine field are studied by using CBM geological theory.The results show that the thickness and distribution of coal seam the No.21-1 in Tianrong Well-field system are large and stable,and the characteristics of coal and rock are good,the permeability of coal bed gas is extremely poor,and the desorption rate of coal bed gas is relatively low,which is unfavorable to high and stable production,enhanced recovery and prolonged development period.