利用地震属性划分瓦斯富集带

Gas Concentration Zoning through Seismic Attributes

从阳煤集团新景煤矿芦南二区北三正、副巷3煤层发生的瓦斯突出来看,该矿的瓦斯富集带主要位于煤层变薄缺失带附近。依据新景煤矿地质资料建立地质模型,并从理论上对提取的地震属性变化特征进行比较,发现其振幅、主频、低频带能量和相位等属性可以作为瓦斯富集带预测的判识依据。勘探成果表明,利用3煤层反射波提取的地震属性,在煤层变薄缺失带上具有明显的响应特征:振幅切片上能量变弱,相似性切片上异常突出,主频切片上表现为高值,主频带能量切片上表现为低值,平均频率相位切片上也存在较大差异振幅。依据该特征,圈定了新景煤矿芦南二区的煤层变薄缺失带。已发生瓦斯突出点与煤层变薄缺失带在地震属性的一致性,证实煤层变薄缺失带是该矿瓦斯防治的重点区域。

Viewing from gas outbursts happened in No.3 coal seam in N3 main roadway and sub-mains,Lunan No.2 district,Xinjing coalmine,Yangquan Coal Group,can find the gas concentration zones are mainly located near the coal thinning and absent zones.Geological modeling is based on data from the Xinjing coalmine,compared seismic attribute variation characteristics picked up theoretically,have found that their amplitude,dominant frequency,low-frequency zone energy and phase attributes can be the basis to distinguish and predict gas concentration zone.Exploration results demonstrated that,seismic attributes picked up using No.3 coal reflection have obvious response characteristics on coal thinning and absent zone： energy weakening on amplitude slices,anomaly prominent on similarity slices,high-value showing on dominant frequency slices,low-value on dominant frequency zone energy slices,and rather large discrepant amplitudes existing on mean-frequency phase slices.Based on these characteristics,coal thinning and absent zones have circled out in Lunan No.2 district,Xinjing coalmine.Seismic attribute consistency of existing gas burst points and coal thinning and absent zone,have demonstrated that the zone is the intensive gas control region in the coalmine.