摘要
为认识水城煤田的瓦斯赋存特征,采用构造对瓦斯的逐级控制理论,分析了构造演化、现今构造组合样式及煤层的非均质性等对煤中瓦斯生成、运移和保存的控制。研究表明:研究区具有稳定的三角洲间湾成煤环境,为甲烷的生成提供了较好的物质基础。煤层沉积后经历了三期次的生烃作用,生成大量瓦斯。盆地隔挡式褶皱发育,对瓦斯赋存的控制作用可分为3种类型:宽缓简单向斜+良好封盖层,不对称向斜+良好封盖层,不对称陡立向斜+良好封盖层。埋藏较深的向斜核部煤变质程度较高,瓦斯含量一般较大。变形较大的构造部位煤体结构变形较严重,使得煤体具有更好的微观孔隙结构。
In order to recognize gas occurrence features in Shuicheng coalfield,the tectonic gradual control theory is adopted to systematically study the control role of tectonic evolution,the current tectonic combination type and coal seam heterogeneity on gas occurrence.The results show that the study area has a good sedimentary environment for coal seam,which provides a material basis for methane generation.After the seams have been deposited,there are three stages of hydrocarbon generation and a large amount of gas is generated.Ejective folds are developed,which control function on gas occurrence is divided into 3 types：simple syncline type with good capping layer,asymmetric syncline type with good capping layer,vertical asymmetric syncline type with good capping layer.The coal metamorphic degree of the deep syncline core is high,and the gas content is generally large.The coal body structure has a large deformation in the structural parts with larger deformation,which makes the coal body have a better micro pore structure.
作者
黄政祥
公衍伟
马署
HUANG Zhengxiang1 , GONG Yanwei2 , MA Shu1(1.Coal Mine Design and Research Institute, Guiyang 550025, China;2. Guizhou University, Guiyang 550025, Chin)
出处
《中国矿业》
北大核心
2018年第B06期307-310,315,共5页
China Mining Magazine
基金
贵州省发展与改革委员会委托项目资助(编号:黔发改能源[2010]555号)
关键词
水城煤田
瓦斯赋存
构造逐级控制
构造样式
非均质性
Shuicheng coalfield
gas occurrence
tectonic gradual control
tectonic style
heterogeneity
