Guizhou Provincial Engineering and Technology Research Center of Coalbed Methane and Shale Gas Coal Mine Exploration of Guizhou Province School of Resources and Geosciences,China University of Mining and Technology

基于贵州松河井田薄-中厚煤层群普遍发育的特点,以可采煤层为主要目标,依据沉积环境、储层特性、煤层间距等因素,将龙潭组主要煤层划分为5个煤组。结合我国北方有关合层排采的经验和松河井田的煤层气地质特征,分析出该区煤层气合层排采的主控因素包括2个方面:一是储层能量,具体参数为压力梯度、含气饱和度和临储比;二是储层导流能力,具体参数包括原始渗透率、煤体结构;根据松河井田储层测试及煤层气生产试验数据,分析得出第1煤组和第2煤组是合层排采的最优组合;第4煤组不适合与其他煤组进行合层排采;第3煤组、第5煤组均不适合与第1煤组及第2煤组进行合层排采,但第3煤组可以与第5煤组合层排采。

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.

国家自然科学基金资助项目(51204162)；贵州省科技重大专项资助项目(黔科合重大专项字[2014]6002号)；