Gas-geology Law And Gas Prediction In Dongbaowei Coal Mine

Taking the No.36coal seam of Dongbaowei coal mine for example,and using theregional tectonic evolution theory and Gas Occurrence tectonic progressive controltheory, this paper aims to clarify the gas geology rule of Dongbaowei coal mine andforecast the gas occurrence.After the Cretaceous coal-bearing sedimentation, the coalseam is mainly affected by the impact of the Yanshan movement. Shuangyashancoalfield occurrence features is controled by the Shuangyashan arcuate tectonic. Stresswill be concentrated in the arcuate structure, coupled with the sealing process of nearlyEW reverse faults,it’s conducive to the formation of gas-rich region.NE andNNE-trending tectonic extension, rifting is beneficial to the gas release. Magmaticrocks activity reached a peak in Northeast at Yanshan period, it maked the coal rankincreased in the region, the gas t increases. Dongbaowei coal mine is divided three gasgeological units. UnitⅠbecomed a closed system by the influence of nearly east-westreverse fault F10and Shuangyashan southern fault,and become gas-rich region. In unitⅡ,F10reverse fault influenced by weathering and erosion, the NE and NNE faultformed by tension is connected with coal seam outcrop, a large number of gasrelease,then form a low gas area. IN Unit Ⅲ,the coal seam is also affected by the F10thrust fault, gas content is relatively high.