Main Controlling Factors on Sandstone Free Gas Accumulation in the Qinshui Basin
Received date: 2014-11-12
Revised date: 2015-06-02
Online published: 2015-10-10
There are a certain number of free gases in the Carboniferous-Permian sandstone in the Qinshui Basin,which are always accompanied by coal-bed methane.It has been a complement to the resource of coal-bed methane.As the accumulation has the features of low porosity,low permeability and continuous distribution like the tight gas,it is always confused with the deep basin gas.It is difficult to know the main controlling factors on accumulation correctly.On the basis of a lot of actual data,with the method of statistical analysis,this study investigates the main controlling factors of reservoir and discusses the genetic mechanism of such kind of gas reservoir more deeply.The results show that this kind of gas accumulation was formed when the CBM was lost and temporarily stays in the sandstone formation,which are in dynamic equilibrium with the CBM.On the premise of the coal-seam with gas,the displacement pressures of mudstone in sandstone roof is the main controlling factor,then followed by the porosity of sandstone.So we can look for this type of gas in the area with high content of CBM,high displacement pressures of roof mudstone and high porosity of sandstone.
LIN Yu-xiang,LUAN Wei-na,HAN Ji-lei,ZHANG Chun-rong,WU Yu-chen,LI Xiu-qin . Main Controlling Factors on Sandstone Free Gas Accumulation in the Qinshui Basin[J]. Natural Gas Geoscience, 2015 , 26(10) : 1873 -1882 . DOI: 10.11764/j.issn.1672-1926.2015.10.1873
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