Feasibility study on combined seam gas drainage under condition of seam group in Songhe Mine Field

Based on the general development features of the thin-nediunm thick seanm group in Songhe Mine Field of Guizhou Provincetaking the mineable seam as the main target.accoding to the sedimentary environmentreservoir features seam interval and ter factos. the main seams in L ongtan rormation coud b divded ito five seam groups.Incomtination with the combined seam gas drainage experiences of Norh China Region in China and the coabed nethane geologc al featues ofSonghe Mline Fiel .the main controlfactors of the combined sean gas drainage in the region were analyzed including thefrllowing aspects The frst aspect woud be the reservoir energy and the certain parameters would be the pressure gradients gas saturation and titial eserve rato .The second aspect ould be the diverston apacity of the reservoir and thecertain parameters would include the orginal perme bilit and cal structre. Acording to the reservoirtest and measurement and the coabed mnethane production trial data of Songhe Mine Field.the analysis showed that the frst seam group and the second seam group would be the best combination of thecombined seam drainage. T he fourh seanm group would not be suitable with other seam group for the combined gas rainag. The third seanm group and the fifth seamgrou all ould not be suitable with the frst seam group and the second seam group forthe combined seam gas drainage.BLut th thrd seam goup could be suitable with the fifth seam group for the combined seam gas drainage.