安鹤煤田彰武-伦掌南部煤层气富集特征及开发潜力分析

Enrichment Characteristics and Development Potential of Coalbed Methane in Southern Zhangwu-Lunzhang Area of Anhe Coalfield

通过对煤层储层条件的初步分析,研究探讨区内煤层含气性的分布规律及控气地质因素,并对煤层气开发潜力进行分析。认为区内煤层气储层吸附/解吸能力强,煤体结构以碎粒煤为主,煤储层为欠压储层,渗透性较低;二1煤煤层气含量较高,平均值为21.67 m^(3)/t,具有"三高一低"的分布特点,表现出向斜控气的特征。煤层厚度、构造、岩浆活动是控制煤储层含气性的主要因素。区内煤层气资源总量为5.636×109m^(3),资源丰度范围在(0.45~3.15)×108m^(3)/km^(2),平均丰度为1.48×108m^(3)/km^(2)。依据资源参数和可采性参数,优选出3个勘探开发有利区。

Through the preliminary analysis of the coalbed reservoir conditions,the distribution law of coalbed gas bearing property and gas controlling geological factors in the area are studied,and the development potential of coalbed methane is analyzed.It is considered that the adsorption/desorption capacity of coalbed methane reservoir in the area is strong,the coal structure is mainly broken coal,and the coal reservoir is under pressure and under saturation reservoir with low permeability;The content of coalbed methane in the first seam of No.2 coal seam is high,with an average value of 21.67 m3/t,which has the distribution characteristics of "three high and one low",showing the characteristics of syncline controlling gas.Coal seam thickness,structure and magmatic activity are the main factors controlling the gas bearing property of coal reservoir.The total amount of CBM resources in the area is5.636×109 m3,and the range of resource abundance is(0.45-3.15)×108 m3/km2,the average abundance is 1.48 ×108 m3/km2.According to the resource parameters and recoverable parameters,three favorable exploration and development areas are selected.