冀北榆树沟煤矿区褐煤地下气化地质条件分析

通过对冀北沽源县榆树沟煤矿白芈系青石砬组含煤地层地质条件进行分析，认为仵该矿区进行煤炭地下气化是可行的。研究区构造简单，为一轴向近东西向的舒缓向斜，主要煤层厚度大，最大平均厚度为24.31m。可采煤层顶板多为泥岩、炭质泥岩，尤其是煤系上覆的“三趾马红土”层，对气体有良好的圈闭作用。由于褐煤的灰分含量高，26％～49．03％，地下气化时对煤层顶板影响小，主要煤层埋藏浅200—300m，水文地质条件简单，根据诸多因素分析认为该矿区适合进行褐煤地下气化开采。

Analysis of Underground Gasification Geological Condition in Yushugou Coalmine Area, Northern Hebei Province

Through Cretaceous System Qingshila Formation coal-bearing strata geological condition analysis in the Yushugou coalmine, Guyuan County, northern Hebei Province, considered that the underground gasification in the area is feasible. The study area is simple structured, a gentle near EW syncline, main coal seams have large thicknesses, and maximum average is 24.31m. Mineable coal seam roofs are mainly mudstone, carbonaceous mudstone, especially coal measures overlying ＂Hipparion red clay＂ has excellent gas trapping function. Because of 26%-49.03% high ash content of lignite, thus has less impact to coal seam roof during underground gasification, shallow burying depth of main coal seams, simple hydrogeological condition. A good many factors indicated that the mining area is adequate to lignite underground gasification exploitation.