Main geological factors and models of high permeability zone under the background of low permeability coal reservoir

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  • 1.School of Resource and Environment,Henan Polytechnic University,Jiaozuo 454000,China; 2.Collaborative Innovation Center of Coalbed Methane and Shale Gas in Central China Economic District,Jiaozuo 454000,China; 3.Henan International Joint Laboratory for Unconventional Energy Geology and Development,Henan Polytechnic University,Jiaozuo 454000,China; 4.Shangxi Coalbed Methane Branch,PetroChina Huabei Oilfield Company,Jincheng 048000,China

Received date: 2018-07-19

  Revised date: 2018-09-12

  Online published: 2018-12-19

Abstract

The geological conditions and development technology of adjacent coalbed methane wells in Zhengzhuang block of southern Qinshui Basin are basically the same,but the gas production varies greatly.In view of this phenomenon,the development characteristics of fracture system in coal reservoir are analyzed by means of structural fracture mapping,logging interpretation of coal body structure,inversion of fracture characteristic fracturing curve and structural curvature analysis.It is considered that the development characteristics of the fracture system and the effective stress in the dominant fracture direction are the main geological factors controlling the high permeability zone under the low permeability background.Three kinds of permeability development geological models are established:Firstly,the fracture system is moderately developed and the effective stress matches,the permeability of coal reservoir is high,and the production of coalbed methane wells is high;Secondly,the fracture system of coal reservoir is over-developed,whether the effective stress is moderate or high,the two conditions are not matched,the reservoir permeability is low,and the gas production is low;Thirdly,the high effective stress type,regardless of the degree of fracture development,will lead to low permeability of coal reservoirs,low gas production.The research results can be used for reference in the prediction of high permeability zones in CBM blocks with similar geological conditions.

Cite this article

Zhang Zhou, Xian Bao-an, Lian Xiao-hua, Wang Qing-chuan, Zhou Min . Main geological factors and models of high permeability zone under the background of low permeability coal reservoir[J]. Natural Gas Geoscience, 2018 , 29(11) : 1656 -1663 . DOI: 10.11764/j.issn.1672-1926.2018.08.020

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