Analysis of main controlling geological factors of production based on “three qualities” of CBM reservoir

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  • New Energy Research Center,CNOOC Research Institute,Beijing,100028,China

Received date: 2018-01-10

  Revised date: 2018-06-04

  Online published: 2019-08-28

Abstract

The resources,reconstruction and recoverability of coal seams are the three key reservoir qualities (TKRQ) that affect the capacity of coalbed methane (CBM).By comparing the production data of 67 wells produced over three years in DJC area,the relationship between TKRQ and well productivity is analyzed in detail.Then,the main geological factors affecting TKRQ are analyzed as well.As the results showed,in this area:(1)The main controlling factor on CBM resources is gas content when the abundance of resources is greater than 1.2×108m/km2,the average daily gas production of CBM well is greater than 1 000m/d,and the thickness of No.3 coal seams is stable.(2)There are five fracturing curve types,where the decline-stable type and decline-wave type are better on gas production.The properties of fault,coal structure and crustal stress have combined influence on the reconstruction of coal seams.(3)The recoverability of CBM is due to the ratio of critical desorption pressure to reservoir pressure and permeability.The CBM well is easier to drainage and high production when the ratio is greater than 0.6 and the water production index per meter is greater than 0.8 m/(d·m·MPa).
 

Cite this article

Guo Guang-shan, Xing Li-ren, Liao Xia, Jiang Rui . Analysis of main controlling geological factors of production based on “three qualities” of CBM reservoir[J]. Natural Gas Geoscience, 2018 , 29(8) : 1198 -1204 . DOI: 10.11764/j.issn.1672-1926.2018.06.004

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