达坂城地区低煤阶煤层气成藏主控因素分析  

Analysis of the Controlling Factors of Low-rank CoalbedMethane Accumulation in Dabancheng Area

作　　者：徐最 XU Zui(Engineering Technology Company,CNOOC Energy Technology&Services Limited,Tianjin 300457)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300457

出　　处：《中国煤层气》2023年第2期17-22,共6页China Coalbed Methane

摘　　要：煤田钻孔资料显示,准噶尔盆地南缘达坂城地区煤层发育稳定,层数多,厚度大,但目前煤层气勘探程度较低。结合已钻井及实验室化验资料,开展研究区煤层气地质特征研究。结果表明:该区煤层厚度大,埋深中等,煤阶低,煤体结构以原生或碎裂结构为主,孔渗较好,含气量较低,煤层气资源潜力较好。进一步分析认为,研究区煤层气以生物成因为主,构造、顶底板岩性及水文地质条件是控制煤层气成藏主要因素,预测山前斜坡带是研究区煤层气富集有利区。The Dabancheng area in the south of Junggar Basin has obtained the industrial coalbed methane flow,but the exploration of coalbed methane in this area is generally low.Based on drilling and laboratory analysis,a study is conducted on the geological characteristics of coalbed methane in the study area.The results indicate that,in the study area,the coal seams are thick,and there are good coal structures,good physical properties,low coal rank,and low gas content,with great potential for coalbed methane resource development.Based on comprehensive analysis,it is proposed that the coalbed methane in this area is mainly biogenic,the coupling of structural geological conditions,top and bottom sealing conditions,and hydrogeological conditions is the controlling factor for coalbed methane accumulation.The piedmont slope zone is a favorable area for the enrichment of the coalbed methane.

关 键 词：低煤阶 煤层气 主控因素 成藏模式 

分 类 号：P618.13[天文地球—矿床学]