下石节煤矿是一座煤、油、气共存的高沼气矿井。该矿位于焦坪矿区的中部,井田走向长4km,倾斜宽3.3km。井田内共含煤5层,即1、2、3、4—1及4—2煤层,分属中侏罗系直罗群及下侏罗系延安群。井田内可采煤层有两层,3号煤局部可采,其厚度在0～3m 之间,埋藏不稳定。主要可采层为4—2煤层,埋藏比较稳定,其厚度在0～34m之间,一般平均厚度为 Xiaoshidai coal mine is a coal, oil and gas coexistence of high biogas mine. The mine is located in the central Jiao Ping mining area, mine length of 4km, tilt width of 3.3km. There are 5 coal layers in coalfield, namely 1, 2, 3, 4-1 and 4-2 coal seams, which belong to Zhiluo Group of Middle Jurassic and Yan’an Group of Lower Jurassic. There are two layers of mineable coal seams in the minefield, and the No. 3 coal is locally recoverable. The thickness of the seam is between 0 and 3m, and the buried ore is not stable. The main recoverable layer is 4-2 coal seam, buried more stable, the thickness of 0 ~ 34m, the average thickness of the average