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- Title
黔西比德—三塘盆地多层叠置独立含煤层气系统发育规律与控制机理.
- Authors
郭晨; 夏玉成; 卢玲玲; 任亚平
- Abstract
A number of independent coalbed methane(CBM) systems are often superimposed in coal-bearing strata with multiple coal seams, and severely impede the multi-layer commingled CBM production rate. So we take Bide-Santang Basin, western Guizhou as examples, variable coefficient of gas content gradient and water head pressure coefficient are used to represent development degree of independent CBM systems quantitatively, and the geological controlling factors and mechanism are analyzed from perspectives of structure, sedimentary and hydrogeology, respectively. Following conclusions are obtained: the marginal faults and the resulted triangle structure framework control the stress-strain characteristics and coal accumulation of the study area. From western marginal fault zone to basin internal part, the ground stress and strain weaken, coal thickness and stability increase and mudstone roof is more developed. Sedimentary facies distribute in NE direction, with the sea influence increasingly enhanced, the deposited characteristics of coal-bearing strata change regularly from west to east in the basin: The sand/mud ratio reduces, sedimentary cycles occur at higher frequency, and authigenic minerals, such as pyrite and kaolinite, tend to be more developed and fill the pores. Groundwater flows from NW to SE, with the increasing flowing resistance, resulting in weak hydrodynamic conditions and groundwater stagnation in the SE direction. Under the coupling controls of structure, sedimentary and hydrogeology conditions, the independent CBM systems are increasingly developed from NW to SE in the basin. The study area is partitioned into four subareas with different development degrees of superposed CBM systems, which are verified by the CBM exploration and development practice, to a certain extent.
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 4, p622
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.02.005