摘要
突出了大区域构造背景下的瓦斯赋存分布特征及其控制因素研究。重庆煤矿区古今构造应力场具有继承性,煤系应力长期得不到松弛,形成含煤岩系的长期应力集中,十分利于瓦斯富集,致使煤与瓦斯突出主要发生在地质构造变动比较剧烈的应力集中区。含煤岩系沉积环境及构造应力场是控制重庆煤矿区瓦斯赋存的两大地质因素。龙潭组海湾—潮坪—沼泽/泥炭相沉积环境具有良好的封盖能力,瓦斯含量普遍较高;须家河组河流冲积平原、湖滨—三角洲沉积体系对瓦斯的封盖能力较弱,瓦斯含量普遍较低。厘定出南桐高突瓦斯带、华蓥山高突瓦斯带、永荣高瓦斯带、渝东南瓦斯带、渝东瓦斯带和大巴山高瓦斯带6个区域性瓦斯地质带。
In this study, the control factors and distribution characteristics of coal seam gas occurrence are empha-sized in large regional tectonic background. Due to the inheritability between ancient and modern tectonic stress fields in Chongqing coal mining area, the coal-bearing formation bears long term effect of stress concentration and cannot be relaxed. Therefore, this makes the coal and gas outburst occur primarily in the stress concentration area of more intense tectonic movements. The tectonic stress field and the sedimentary environment of coal-bearing formations are two major geological factors in controlling gas occurrence. Longtan Formation is mainly of bay-tidal-peat swamp facies, which indicates that it has great sealing ability to reserve gas, and the gas content is generally high. However, the coal seam gas content of Xujiahe Formation is generally low, because in Xujiahe Formation the ability of reserving gas is poor, sedimentary systems of river alluvial plain and lakeshore-delta had been developed. Finally, six regional gas geological zones are defined, including Nantong high outburst gas zone, Huayingshan high outburst gas zone, Yongrong high gas zone, southeast Chongqing gas zone, east Chongqing gas zone, and Dabashan high gas zone.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2015年第2期1-7,12,共8页
Coal Geology & Exploration
基金
国家自然科学基金重点项目(U1361207)
国家自然科学基金面上项目(41372159)
中国矿业大学中央高校基本科研业务费专项资金(2014ZDP03)
国家科技重大专项课题(2011ZX05040-005)
关键词
瓦斯赋存
构造控制
沉积环境
构造应力场
gas occurrence
structural control
sedimentary environment
tectonic stress field
