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Effect factors on co-mining of sandstone gas and coalbed methanein coal series and threshold of parameter in Linxing block,Ordos Basin

Shen Jian1,2,Zhang Chun-jie1,Qin Yong1,Zhang Bing3   

  1. 1.CME’s Key Laboratory of CBM Resources and Reservoiring Process,China University of Mining and Technology,Xuzhou 221008,China;
    2.PetroChina Huabei Oilfield Company,Renqiu 062552,China;3.China United Coalbed Methane Corporation,Ltd.,Beijing 100011,China
  • Received:2016-11-06 Revised:2016-12-08 Online:2017-03-10 Published:2017-03-10

Abstract:

Joint mining of unconventional gas resources in coal series,including coalbed methane(CBM)and tight sand gas,are an important way to protect natural gas resources and improve the efficiency of development.Based on geological conditions of coal series in Linxing Block of Ordos Basin,a numerical simulation study was conducted to discuss the feasibility of co-mining of coal series sandstone gas and coalbed methane using double-layer geological model without inter-flow between layers.The paper discussed the influence factors for affecting co-mining,and created a comprehensive evaluation model according to the contribution rate,and confirmed the threshold value of reservoir parameter.The results showed that the geological structure of the study block was simple,the widely covered hydrocarbon source of coal stacks each other with large-scale sandstone reservoirs,coal reservoir and shale reservoir,which was favorable to gas reservoir formation.The shale gas production potential in the study area was low,which were mainly composed of sandstone gas and coalbed methane.With the increase of permeability,pressure coefficient,thickness and porosity of coal series sandstone reservoir,the cumulative contribution rate of sandstone gas accumulation in 10 years increased,but with the increase of water saturation of sandstone reservoir,it decreased.In order to realize the co-mining of coal series sandstone gas and coalbed methane,the co-mining composite index should be 8×10-7-4.44.The value above 4.44 is suitable for sandstone gas single production,while under 8×10-7 is suitable for coalbed methane single mining.These wells were suitable for co-mining that No.8+9 coal of L-3,No.4+5 coal of L-10,No.4+5 coal and No.8+9 coal of L-1,L-4,L-6 and L-9,and other wells were suitable for sandstone gas single mining.

Key words: Linxing Block, Coal series sandstone gas, Coalbed methane, Effect factor, Threshold of co-mining

CLC Number: 

  • TE132.2

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