Structure Control on Gas Deposition in Qidong Minefield of Huaibei Mining Area
LI Heng-le
QIN Yong
ZHANG Yu-gui
JIAN Kuo
Abstract：Based on gradual control theory of gas deposition structure and regional structure evolution,the paper discussed gas deposition controlled by the structure formed under different period and different property structure stress field after coal formation of Qidong Minefield in Huaibei Mining Area.The results showed that Yanshan period was the key period to control the gas deposition,series faults and folds formed under a role of a NW-SE horizontal extrusion stress field settled the structure pattern and gas position features in Huaibei Mining Area.In the structure evolution process after the coal formation,the EW directional structure was in extrusion at the initial period and in tensile at the late period and was favorable for the gas dissipation.A NE-NNE directional structure roughly experienced three evolution processes,including the extrusion shearing-tensile-extrusion and the NW directional structure was always in an extrusion state.The NW di-rectional structure was the most favorable for gas keeping,NE-NNE directional structure was the second and the EW directional structure was the worst.The different property faults formed in different periods in Qidong Minefield changed the gas deposition pattern within the minefield and caused the gas deposition features differentiation in the south and north,and partition in the east and west.The gas deposition features and control factors between each fault and block would be different and each fault and block would be an independent gas geolog-ical unit.
Keywords：gas depositionstructure evolutiongradual controlgas geological unit
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：6( 42-46,50 )