贵州省煤矿瓦斯赋存构造控制规律与分带划分

The rule of tectonic control and the zoning division of coalmine gas occurrence in Guizhou Province

瓦斯赋存规律认识不清,是导致煤矿瓦斯突出灾害频发的根本原因。应用瓦斯赋存地质构造逐级控制理论,结合贵州省煤矿瓦斯地质图编制资料,探讨了贵州省煤矿瓦斯赋存构造控制规律,进行了瓦斯分带划分和瓦斯带特征分析。研究结果表明:贵州省位于滨太平洋构造域和西部特提斯构造域的接合部,其构造演化控制着成煤环境和瓦斯赋存。燕山运动形成的一系列褶皱、逆掩断层和推覆构造,使煤体强烈变形、构造煤特别发育,是导致贵州省瓦斯突出严重的根本原因。燕山期岩浆活动,使煤的变质程度增加,生烃能力增强。将贵州省煤矿瓦斯赋存分布划分为3个高突瓦斯带和1个瓦斯带,即六盘水高突瓦斯带、织纳六枝贵阳北高突瓦斯带、黔北高突瓦斯带和黔东瓦斯带。

The unclear understanding of the gas occurrence rule is the fundamental reason of frequent gas outburst disaster.Based on stepwise tectonic control theory of gas occurrence,and combined with datum of Guizhou Province gas-geology map,the tectonic level control rule and zoning division of gas occurrence have been discussed.The results show that Guizhou Province is located in the copulae of the circum-Pacific tectonic tract and the western Tethyan tectonic domain,and its tectonic evolution controlled the coal-forming environments and gas occurrence.During Yanshan movement,a series of folds,overthrust fault and nappe tectonics formed,then resulting in the tectonic coal developed;those were the primary reason of serious coal and gas outburst in Guizhou Province.Moreover,Yanshanian magmatism increased coal metamorphism and hydrocarbon productivity was enhanced.Coalmine gas occurrence and distribution in Guizhou Province were divided into four zones,namely Liupanshui,Zhina-Liuzhi-Guiyangbei and northern Guizhou province three high and outburst gas zones and eastern Guizhou province gas zone.