盘江矿区盘关向斜煤系地层及瓦斯地质规律研究

Study on Coal Measure Strata and Gas Geological Law of Panguan Syncline in Panjiang Mining Area

鉴于盘关向斜构造所属矿井煤系地层及瓦斯地质规律存在区域上的模糊性等问题,对该区域22处生产矿井的地质条件进行统计分析,研究地质构造、可采煤层数、煤层厚度、煤层倾角、煤层层间距等地质因素对瓦斯赋存的影响。研究表明:该区域受向斜构造作用,煤层主要分布在二叠系上统龙潭组;煤层分化严重,薄煤层和中厚煤层占比98.5%,倾斜和缓倾斜煤层占比95.3%,煤层层间距近81.7%集中在0~20 m内;盘关向斜所属矿井普遍为突出矿井,松软煤层瓦斯灾害严重,测点瓦斯含量超过8 m^(3)/t占总数的55.1%,北西翼及南东翼矿井瓦斯含量梯度存在一定差异,南西翼矿井瓦斯含量主要集中在8.5 m^(3)/t左右;瓦斯含量有随煤层埋深、煤层厚度增加而增大趋势。

In view of the regional fuzziness of coal measure strata and gas geological law in Panguan syncline mine,the geological conditions of 22 production mines in this area were statistically analyzed,and the influence of geological factors such as geological structure,minable coal seam number,coal seam thickness,coal seam dip angle and coal seam spacing on gas occurrence was studied.The study shows that the area is affected by syncline structure,and the coal seam is mainly distributed in the Permian Longtan formation.The coal seam differentiation is serious,the thin coal seam and medium thick coal seam account for 98.5%,the inclined and gently inclined coal seam account for 95.3%,and the coal seam spacing is nearly 81.7%concentrated in 0-20 m.The mines belonging to Panguan syncline are generally outburst mines,and the gas disaster in soft coal seam is serious.The gas content of measuring points exceeds 8 m^(3)/t,accounting for 55.1%of the total.There is a certain difference in the gas content gradient between the northwest wing and the southeast wing,and the gas content in the southwest wing is mainly concentrated in about 8.5 m^(3)/t.Gas content increases with the increase of buried depth and thickness of coal seam.