趋势面分析法圈定氡异常

测氡技术能有效圈定煤炭气化燃空区范围。为了准确圈定氡异常的位置和范围，采用趋势面分析方法，以不同次数的多项式拟合氡元素的整体分布趋势；基于拟合度分析和F分布检验确定最佳趋势面多项式的次数，在此基础上进行残差(剩余)分析，识别局部异常，进而圈定氡值异常范围。以内蒙乌兰察布新奥集团煤炭地下气化燃空区测氡数据为例，验证了该分析方法在圈定地下气化燃空区范围方面的可行性。结果表明：该方法圈定的氡异常与验证钻孔点吻合程度好，明显优于使用传统方法圈定氡异常的方法，为低放射性地区氡异常的圈定提供了一种快速、简单并且有效的方法。

Delineating radon anomalies by the trend surface analysis

Radon detection technique can effectively delineate the extent of combustion space of underground coal gasification.In order to accurately delineate the position and range of radon anomaly,the authors used trend surface analysis,employed different degrees of polynomial to fit the overall distribution trend of radon element,based on the fitting analysis and F distribution test,determined the degree of polynomial of the best trend surface used to delineate radon anomaly,and then analyzed the residual (surplus),recognized local anomalies and ultimately delineated the range of radon anomaly.Exemplified by the radon data obtained in the combustion space area (CSA) of underground coal gasification (UCG) in Wulanchabu,Inner Mongolia,this paper has validated the feasibility of the method in delineating the CSA of underground coal gasification.Studies show that the radon anomalies delineated by this method is obviously superior to the traditional method,coincides well with the verified drilling points and this method is rapid,simple and effective,can be applied in low radioactive area.