Impact of Limestone of No.15 Coal Seam Roof on the Coal Bed Methane Exploitation, Southern Qinshui Basin
详细信息
- 责任者：Lu Xiaoxia (School of Energy Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Huang Wenhui
- 刊名：Geoscience
- 出版年：2012
- 卷期：26(3)
- 关键词：煤层气 ; coalbed gas ; 煤层顶板 ; coal seam roof ; 沁水盆地 ; Qinshui Basin
- 页码：p.518-526
- 图表：4 illus., 2 tables, 25 refs.
- 分类号：1003
- issnNo：ISSN1000-8527
- isbnNo：CN11-1856/P
摘要
From the aspects of limestone’s thickness,the crack development,the coal seam and roof connection and the regional hydro-geological conditions,this paper discussed the impact of limestone on the exploitation of coal bed methane.The results indicate that the water richness of the limestone is low,but is high in some places where the faults and karst collapse are developed.The thickness of limestone has nothing to do with the gas and water production of the CBM wells.The cracks of limestone are well developed,most of which are full of calcite,resulting in poor hydraulic conductivity and storage performance.There are two connection types between limestone and No.15 coal seam.One is direct connection that limestone overlays No.15 coal seam,the other is indirect connection that mud,sand and No.14 coal seam are contained between limestone and No.15 coal seam.