采空区瓦斯地面井抽采瓦斯来源及储量预测研究

Study on Gas Sources and Prediction in Extraction Area of Gas Surface Wells in Goaf Area

瓦斯是一种混合气体,主要成分为甲烷。对于瓦斯危害事故的防治、治理以及对于瓦斯资源的有效利用一直以来是困扰全世界煤矿生产单位以及研究学者的一大难题。近年来随着瓦斯抽采技术的不断发展,其作为治理瓦斯危害的有效手段被广泛利用,而准确地预测瓦斯储量是该项工作能顺利进行的基础。本文分析了李村煤矿老采空区的瓦斯赋存状态及分布范围,采空区瓦斯主要来自残留煤柱、遗煤和邻近煤岩层。利用分源预测法,通过建立瓦斯储量计算模型,预测06地面瓦斯抽采井采空区瓦斯最大可采资源量为643.2万m3,实际累计抽采量500余万m3。由地面井(钻孔)实际抽采数据可知,该模型对采空区瓦斯储量做出较为准确的预测,为该矿地面井采空区瓦斯抽采工作奠定了较为可靠的理论基础。

The prevention and control of gas hazard accidents and the effective utilization of gas resources have been a major problem that has puzzled coal mine production units and researchers all over the world.With the continuous development of gas extraction technology in recent years,it has been widely used as an effective means to control gas hazards,and accurate prediction of gas reserves is the basis for the smooth progress of this work.By analyzing the gas occurrence state and distribution range in the old goaf of Licun Colliery,the paper points out the specific sources of gas come from residual coal pillar,remaining coal and adjacent coal rock stratum and predicts the maximum recoverable gas resources in the goaf of the 06 surface gas extraction well is 6.432 million m3,and the actual cumulative extraction amount is more than 5 million m3 through different-source prediction method and the establishment of gas reserves calculation model which shows that the prediction of the gas emission of the mine is relatively accurate,providing a reliable theoretical foundation for the gas drainage of the mine.