重庆观音峡矿区新店子井田煤层气赋存影响因素及开发模式研究

Study on CBM Hosting Impacting Factors and Exploitation Mode in Xindianzi Minefield, Guanyinxia Mining Area, Chongqing

基于煤层气赋存及开发理论,运用煤层煤心含气量等测试手段,以重庆观音峡矿区新店子井田为研究对象,对煤层气赋存影响因素进行了分析研究,并优选出适合于研究区的煤层气开采利用模式。研究认为,煤化程度、地质构造、围岩物性及封盖能力、煤层埋深、煤层厚度、水文地质条件是影响煤层气赋存的主要因素,其中煤层埋深起主导作用,煤层埋深与甲烷含量呈显著正相关关系,其次是区内压扭性断裂构造较为发育,构造应力相对集中的断层附近煤层甲烷含量明显高于其他区域。研究区开发层段的煤储层属超压、较高渗透率储层,层数多,倾角较大,高角度沿煤层钻井、排水降压增渗的开采技术更适合研究区的煤层气开发。

Based on CBM hosting and exploitation theories, using coal core methane content testing means, taking the Xindianzi mine?field, Guanyinxia mining area, Chongqing as subject investigated, carried out CBM hosting impacting factor analytical research, opti?mized CBM exploitation and utilization modes propitious to the study area. The study has considered that the coalification level, geologi?cal structure, enclosing rock physical property and sealing ability, coal buried depth, coal thickness and hydrogeological condition are main factors impacting CBM hosting. In which, coal buried depth plays a leading role and positively correlated with methane content;secondly, compresso-shear faulted structures rather well developed in study area, coal seam methane content near the faults with tec?tonic stress relatively concentrated is obviously higher than other regions. Coal reservoir of study area exploitation intervals belongs to overpressure and rather high permeability reservoir with multiple layers, rather large dip angles, and the exploitation technology of high-angle coal seam drilling drainage, depressurization and permeability increasing is more propitious to study area CBM exploitation.