准南煤田硫磺沟矿区向斜-承压式煤层气富集模式

Syncline-confined-water Model of Coalbed Methane Enrichment Area in Liuhuanggou Mining Area,Southern Junggar Coalfield

通过系统收集、分析准南煤田硫磺沟矿区最新的勘探资料和生产资料,对影响硫磺沟矿区煤层气富集的煤阶、构造、水文、盖层等诸多因素进行研究。结果表明:多期构造活动形成了阿克德向斜及其北翼逆断层,三角洲平原沼泽控制了厚煤层发育,扇三角洲相、河流相、湖泊相控制了封盖层,火烧区影响下的弱径流地下水动力系统封堵了煤层气。上述因素共同控制了硫磺沟矿区向斜-承压煤层气富集模式。具有深埋藏、高矿化度地下水及封闭盖层条件的阿克德向斜轴部和临近轴部的两翼地区为煤层气有利富集区。

Through systematic collection and analysis of the latest exploration data and existing coal mine production data,controlling factors on the coal rank,structure,hydrology,and caprock enrichment of coalbed methane in Liuhuanggou mining area,Southern Junggar coalfield are studied.The results show that the multiphase tectonic activity might cause the formation of the Akede syncline and the reverse fault on its northern limb.The delta plain swamp controls the development of thick coal seams,and the fan delta,fluvial and lacustrine facies control the lower caprock layer,and the burning-zone weak runoff groundwater dynamic system blocks the coalbed methane.These factors jointly control the enrichment model of the syncline-confined coalbed methane in Liuhuanggou area.It is considered that the Akede synclinal axis,featured by its deep burial depth,high-salinity groundwater and closed caprock conditions,is the most favorable enrichment zone for coalbed methane.