Control Mecganism of Buried Deptg and In-Situ Stress for Coal Reservoir Permeability in Western Guizgou
Xu Hongjie
Sang Shuxun
Yi Tongsheng
Zhao Xia
Liu Huihu
Li Lin
Abstract：Based on geological analysis of data of 16 testing wells in the Liupanshui and Zhina coalfields,the spatial distribution of coal reservoir permeability and characteristics of in-situ stress in the western Guizhou are discussed,and the control mecha-nism of buried depth and in-situ stress for coal reservoir permeability is obtained in this study.It is shown that the coal reser-voirs have the characteristic of ultra-low and low permeability (<0.1 ×10-9 m2 ),and the permeability of coal reservoir with 0.1×10-9-1.0×10-9 m2 has considerably large proportion.The type of in-situ stress field is gradually undergoing a possible change from dynamic field in shallow layer to hydrostatic pressure field in deep layer.It has a negative power exponent relation-ship of coal reservoir permeability and buried depth,but the change of permeability is in accordance with in-situ stress field changed.The permeability of coal reservoir varies in different testing wells,decreasing with the increased in-situ stress and depth,and its spatial distribution has a law of“low-high-low”from SW to NE for the intensity of the stress controlled.The role of coal depth to permeability is supposed to be the in-situ stress in action essentially.The main control mechanism of coal permeability difference is that the pore and fracture tend to compress or close caused by the deformation and fragmentation of coal reservoirs under the influence of high in-situ stress in regional tectonic location of study area.
Keywords：western Guizhoucoal reservoirpermeabilityburied depthin-situ stresscontrol mechanismenergy geology
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1507-1516 )