彬长矿区煤层气储层参数及开发潜力

彬长矿区煤的变质程度低,矿井瓦斯涌出量大,瓦斯治理形势日趋严峻。根据矿区地质勘查、井下及煤层气井所获得的地质资料显示,煤层气开发的主要目标4煤层厚度大,分布稳定,煤体结构好,渗透率和气含量相对较高,气含量最高可达6.29m3/t,估算煤层气资源量为132.743×108m3。依据煤层气资源丰度划分,矿区煤层气富集区总面积为87.41km2,资源量为40.06×108m3,主要分布在大佛寺井田,相对富集区主要位于胡家河井田中南部和孟村井田东部,贫气区主要位于孟村井田西部、文家坡井田。综合分析认为研究区煤层气开发地质条件相对较好,属于可以抽采煤层,大佛寺井田为地面煤层气勘探开发最具潜力的地区。

CBM Reservoir Parameters and Exploitation Potential in Binchang Mining Area

Coal metamorphism degree in the Binchang mining area is low with large mine gas emission rate, thus increasingly severe gas governance situation. The geological data from exploration, underground and CBM wells have shown that the main exploitation tar-get coal seam No.4 has large thickness, stably distributed, good coal structure, relatively high permeability and gas content （can be 6.29m3/t as high）, estimated CBM resources 132.743×10^8m^3. Based on CBM resource abundance, total area of CBM enrichment zone in mining area is 87.41km2, resources 40.06×10^8m^3. They are mainly distributed in the Dafosi minefield, relative enrichment area is main-ly in south-central Hujiahe minefield and eastern Mengcun minefield, gas barren area is mainly in western Mengcun minefield and Wenjiapo minefield. The comprehensive analysis considered that the study area has relatively good CBM exploitation condition with gas drainable coal seams;Dafosi minefield has highest surface CBM exploration and exploitation potential.