化乐一矿6煤组瓦斯压力特征及分布规律

Gas Pressure Features and Distribution Law of No.6 Seam Group in Huale No.1 Mine

煤层瓦斯压力是评价煤层突出危险性及煤层气开发研究的重要指标,采用朗格缪尔公式,结合化乐一矿勘查阶段部分钻孔揭露6煤组时实测的瓦斯含量计算煤层瓦斯压力,并根据煤层瓦斯赋存具有分区分带的特点,将化乐一矿勘查区划分为4个瓦斯地质单元。根据断层对瓦斯压力的影响程度,分别对4个单元内6煤组的瓦斯压力与基岩埋深关系进行回归分析,发现第2单元受开放性断层影响,埋深500 m以浅的瓦斯压力与基岩埋深为负相关,其他区域为正相关,相关系数均大于0.6;依据回归分析结果及异常点筛选,建立了瓦斯压力分布的6个数学模型。

The gas pressure of the seam is an important index for the evaluation of the seam outburst danger and for the study on the coal bed methane development.In combination with the seam gas pressure calculated with the site measured gas content when the partial boreholes of the geological exploration exposed No.6 Seam Group in Huale No.1 Mine and based on the sectional and zone features of the seam gas deposits,the Langmuir equation was applied to divide the geological exploration zone of Huale No.1 Mine into 4 gas geological elements.According to the influence degrees of the fault to the gas pressure,a regressive analysis was conducted on the relationship between the gas pressure and the bedrock depth of No.6 Seam Group in the four elements.The open fault influences to the second element were obtained.There was a negative relationship between the gas pressure above the depth of 500 m and the bedrock depth and there was a positive relationship between the other regions.The related coefficients would be all over 0.6.Based on the regressive analysis results and the screening separation at the abnormal location,six mathematical models of the gas pressure distribution were finally established.