- 责任者：Qin Yong (Institute of Mineral Resources and Geosciences ; China University of Mining & Technology ; Xuzhou ; Jiangsu ; 221116) ; Xiong Menghui
- 刊名：Geological Review
- 出版年：2008
- 卷期：54(1)
- 关键词：煤层气 ; coalbed gas ; 含油气系统 ; petrolifeous system ; 贵州 ; Guizhou Province
- 页码：p.65-70
- 图表：3 illus., 1 table, 16 refs.
- 分类号：1003
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
Using the method of geological analysis and taking the Shuigonghe syncline, Zhijin—Nayong Coalfield, as a case, the nonlinear occurrence of the geological conditions of the coalbed methane ( CBM) in vertical section was discussed based on the measured data, and the academic viewpoint "unattached multiple superposed CBM-bearing system" was suggested and demonstrated preliminarily. It was shown that the mean CBM content of single Upper Permian coal seam and the content gradient between backfence seams are various in undulation, there is two sets of the distinct system in the correlation of the coal seam depth to the reservoir pressure coefficient, and the secondary sequences in the stratigraphic frame is highly consistent with single sectioning of the CBM gradient. These imply that the exchange of the undersurface liquid in the coal-bearing strata is generally absent among various coal seams, which might results in relative independency of the CBM systems among various coal seam groups.