Analysis on relationship between coal structure and gas production quantity in deep coal seam of Yanchuannan Area at Southeast Ordos
Chen Gang
Hu Zongquan
Su Kun
Zhang Yonggui
Abstract：According to the problems of the high depth,ultra low permeability of the coal reservoir,low pressure coefficient and geothermal gradient,coalbed methane production slow occurred in No.2 seam of Permian Shanxi Formation in Yanshuangnan Block at the Southeast edge of Ordos Basin,with fine description of the deep coal reservoir conducted on the great basic information of the block,based on the establishment of the coal structure standard quantitative divided with the logging curve,in combination with the observation of the partial logging rock core,the coal structure of No.2 major seam in Shanxi formation of Yanchuannan gas field was divided to the primary structure coal,fractured structure coal and broken partical structure coal.According to the trial drainage production of the gas field,the fitted different coal structure thickness found that the second crack of the fractured structure coal was developed,the permeability was good and the single well gas production was high.Among them the second crack developed zone with the thickness of the broken structure coal more than 1 m was the most favorable high production zone.The gas production effect of the seam was good and the sustainable and stable drainage could realize the area reduced,so as to improve the production of single well.
Keywords：Ordos BasinBlock of Yanchuannandeep coal seamcoal structuredaily gas production
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 107-112 )