基于弹性波阻抗理论的构造煤预测方法研究  

Tectonoclastic Coal Prediction Based on Elastic Wave Impedance Theory

作　　者：邹冠贵[1,2] 李来春 Zou Guangui;Li Laichun(State Key Laboratory of Coal Resources and Safe M ining,CUMTB,Beijing 100083;School of Geosciences&Surveying Engineering,CUMTB,Beijing 100083)

机构地区：[1]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [2]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《中国煤炭地质》2018年第2期80-84,共5页Coal Geology of China

基　　金：国家青年科学基金(41402143);国家重点研发计划项目(2016YFC0501102);中央高校基本科研业务费专项基金(2013QM02)

摘　　要：从弹性波阻抗基础理论出发,通过对不同煤体结构的模型计算和分析,探讨弹性波阻抗对煤体结构变化的敏感性,发现与利用Whitcombe方法进行归一化与未做归一化,其弹性波阻抗都表现为随着角度的增大对煤体结构变化的敏感性下降。研究表明,纵、横波速度之比(υ_p/υ_s)及泊松比(σ)随煤体破坏程度的增大而增大,具有很好的相关性。通过纵、横波速度之比的平方与泊松比的乘积[(υ_p/υ_s)~2×σ](G属性)能够很好的区分煤体结构。可采用基于弹性波阻抗反演的方法来提取G属性。以寺河煤矿西二盘为例,利用测井曲线计算和分析了各个钻孔中3~#、9~#和15~#煤层的G属性值,最终把G=2.5的区域划分为构造煤发育区域。Start from elastic wave impedance fundamental tlieory,through model computation and analysis for diferent coal mass structures,discussed sensitivenes of elastic wave impedance on coal mass structural variation and found that the elastic wave impedance without normalized or normalized through the Whitcombe:Start from elastic wave impedance fundamental tlieory,through model computation and analysis for diferent coal mass structures,discussed sensitivenes of elastic wave impedance on coal mass structural variation and found that the elastic wave impedance without normalized or normalized through the Whitcombe normalization m ethod,the sensitivenes will be decreased along witli the increasing of tlie dip angle.Further analysis has found that the velocity ratio of P wave to S wave(vp/vs)and Poisson’s ratio ct will be increased along witli the increasing of destructiveness,thus have good interdependency.Through(vp/vs)2×σ(G atriliute)can distinguish coal mass structures better,and extract G attribute through elastic wave impedance inversion.The paper taking the Sihe coalmine W2 panel as the study area,through logging traces computed and analyzed G attributes of coal seam Nos.3,9 and 1 5,finally taking the areas with G=2~4 as tectonoclastic coal developed areas.

关 键 词：弹性波阻抗 泊松比 纵、横波速度 构造煤 

分 类 号：P631.4[天文地球—地质矿产勘探]