Coal Reservoir Properties and Coalbed Gas Controlling Factors of  Jiaozuo Coalfield

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  • 1.School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;
    2.School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China

Received date: 2008-11-06

  Revised date: 2009-03-05

  Online published: 2009-06-10

Abstract

Based on measures on coal samples and the relative previous data, the property of fracture and pore structure, permeability and adsorption of the Ⅱ1 coalbed methane reservoir in the Jiaozuo coalfield were systematically studied. The gas-bearing change law and the influence factors on gas-bearing properties were discussed using qualitative and quantitative analyses. The study shows, micropores are the major pore, transitional pores are the second and macropores are far less in the Ⅱ1 coal, thus for the kind of coal, the adsorption capacity is very high, the diffusibility is a little strong, but the capacity of seepage and laminar flow is very weak. The permeability coefficient is low and decreases with the burial depth of the coalbed, and the permeability also is influenced by the geo-structure and can be improved under hydraulic fracturing. The roof and floor of the Ⅱ1 coalbed provide favorable gas\|preservation conditions, and the effective burial depth and faults structure are also the major factors causing gas-bearing change in the Ⅱ1 coal. The effective burial depth and gas-content is in positive correlation. The gas content in the axial part of the syncline is greater than that in the wings, and the relation is the very opposite in the anticlines. The gas content is often low near the regional faults or in the intersection part of the regional faults.

Cite this article

ZHANG Xiao-Dong, LIU Tan-Hao, ZHANG Zi-Qu, WANG Li-Li, LIU Gao . Coal Reservoir Properties and Coalbed Gas Controlling Factors of  Jiaozuo Coalfield[J]. Natural Gas Geoscience, 2009 , 20(3) : 446 -453 . DOI: 10.11764/j.issn.1672-1926.2009.03.446

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