It is very important to make clear the characteristics of gas distribution in a coal mine. Based on that,gas level of the coal mine can be determined and some effective technical measures can be carried out to prevent gas hazard during mining. The two kinds of methods, building linear regression equation or creating mathematic model,are always used to analyze the gas distribution,however are obviously restrained by the lower relativity of regression equation or the extreme difficulties of creating mathematic model. In this paper,gas distribution in a region is considered on its gradual changing because of the integrality and continuity of coal seam. According to the groups of measured data of gas content from prospect drilling and their corresponding geographical coordinates, some suitable fitting equations and their spatial trend surface images are obtained,by applying the trend surface analysis method and by conducting their verification and validation in the appropriateness. These equations and images can be used to achieve the quantification and visualization to gas distribution in a coal mine. The application results demonstrate that the achieved fitting equation and its image of the trend surface can much more accurately and visually express the characteristics of gas distribution of No. 3 coal seam in Libi coal mine in Jincheng mining area.%比较准确地分析和掌握矿井瓦斯分布特征,是确定矿井瓦斯等级和制定瓦斯治理规划的重要依据.常用预测方法中,寻求煤层瓦斯与其埋深的线性回归方程一般相关性较差；而建立比较准确的数学模型则非常困难.针对以上问题,基于连续的空间地质体瓦斯分布也必然具有连续性的指导思想.以实测获取的多组瓦斯含量值为依据,结合各测试点的地理坐标值,通过应用空间趋势面分析及其适度性检验方法,最终得到能够定量、可视化描述煤层瓦斯分布特征的合理拟合方程和空间趋势面图.该方法在国投晋城公司里必矿的应用结果表明,对实测数据的拟合适度性比较高,能够准确、直观地反映该基建矿井主采3号煤层的瓦斯分布特征.
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