利用高精度磁法圈定陕北地区煤层火烧边界

Determining the Spontaneous Combustion Boundary of Northern Shaanxi Coal Seam Using High Precision Magnetic Method

文章通过对陕西省陕北某矿区煤层自燃过程的分析,建立了包括正常煤层、熄灭带、自燃烧变带等“三位一体”的斜台阶模型,并进行理论模型数值模拟的正演计算,对磁法的实测资料进行综合分析和研究,采用异常特征点法,用高精度磁法勘探准确圈定煤层的火烧边界,结合钻探资料、野外调查的地质资料加以验证,勘探效果良好。这一研究成果应用于陕北煤田中,能够为井田的储量计算、火烧区边界划分以及安全生产和设计提供有力的依据,更好地为政府管理部门的决策和规划服务。

Based on the analysis of the spontaneous combustion process of coal seam in a mining area in northern Shaanxi Province,this paper establishes the oblique step model including normal coal seam,extinguishing zone,self-combustion variable belt and so on,and carries on the forward calculation of numerical simulation of theoretical model,synthetically analyzes and studies the measured data of magnetic method,and adopts the anomaly feature point method.The fire boundary of coal seam is accurately identified by high precision magnetic exploration,and the exploration effect is good by combining drilling data and geological data of field investigation.The research results are applied in the coalfield of northern Shaanxi province,which can provide a strong basis for the calculation of reserves,fired areas boundary division and safe production and design of the well field,and better serve the decision-making and planning of the government management department.