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阳泉新景煤矿生产实践发现3#煤层发生的煤与瓦斯突出事故大部分位于煤层冲刷带.三维地震勘探记录地层连续性好、控制精度高,是识别煤层冲刷带最常用的技术手段.本文以新景矿芦南二区为研究区,建立二维正演模型,研究煤层的地震响应规律,发现其振幅和相位属性对煤层冲刷带响应明显.利用该区现有的三维地震资料,综合瞬时振幅属性特征、地震相分类特征及声波阻抗响应特征,圈定冲刷带平面位置及分布范围.运用有限元分析软件对煤层冲刷带应力分布进行三维正演模拟,结合煤样测试结果,对区内应力异常带的煤层瓦斯和煤体结构等进行分析.研究发现煤层冲刷带过渡区段突出危险性最大,是圈定冲刷带的关键部位,研究成果与实际突(喷)出点位置吻合度较高.总之:1)煤层冲刷作用是导致瓦斯地质条件差异性的主要因素之一,过渡区段为重点防突区域;2)综合多种地震岩性信息响应特征在准确识别煤层冲刷带位置及分布范围方面效果显著.
The production practice of Yangquan Xinjing Coal Mine found that most of the coal and gas outburst accidents occurred in No.3 coal seam are located in the coal seam erosion zone.Due to the good continuity and high control accuracy recorded by 3D seismic prospecting, it is the most commonly used technical means to identify the coalbed erosion zone.In this paper, In the second area of Luonan of Xinjing Mine as research area, a two-dimensional forward model was established to study the seismic response law of coal seam, and its amplitude and phase properties were found to have obvious response to coal seam erosion zone.Based on the existing 3D seismic data in this area, Amplitude property, seismic facies classification and acoustic impedance response characteristics, and define the location and distribution range of the erosion zone.By applying finite element analysis software to simulate the stress distribution in the erosion zone of coal seam, combining with the coal sample test results, The coal seam gas and the coal body structure in the anomalous zone are analyzed.The research shows that the transition zone of the coalbed erosion zone is the most prominent danger zone and is the key part for delineating the erosion zone.The research results are in good agreement with the actual location of the spout point. In short: 1) Coal seam scouring is one of the main factors leading to the difference of gas geological conditions, and the transitional section is the key anti-collision area; 2) More seismic lithologic characteristics in response to information identifying the location and distribution accurately flush seam with a significant effect.