透射法典型槽波数据波场分析  

Wavefield analysis of typical in-seam seismic data by transmission method

作　　者：冯磊[1,2] 杜艳艳 李松营[3] 姚小帅 杨艳军 FENG Lei;DU Yan-yan;LI Song-ying;YAO Xiao-shuai;YANG Yan-jun(Institute of Resources and Environment, Henan Polytechnic University, Henan Jiaozuo 454000, China;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Jiaozuo 454000, China;Geological Institute, Yima Coal Industry Group Company Limited, Henan Yima 472300, China)

机构地区：[1]河南理工大学资源环境学院,河南焦作454000 [2]中原经济区煤层(页岩)气河南省协同创新中心,河南焦作454000 [3]义马煤业集团股份有限公司地质研究所,河南义马472300

出　　处：《地球物理学进展》2018年第2期590-595,共6页Progress in Geophysics

基　　金：国家科技重大专项项目(2011ZX05040-005);河南省高校科技创新团队支持计划项目(14IRTSTHN002);河南省瓦斯地质与瓦斯治理重点实验室--省部共建国家重点实验室培育基地开放基金项目(WS2017A04)联合资助

摘　　要：煤矿井下巷道煤层中采集的槽波地震数据中包含多种类型地震波,对这些波组认识存在争议.通过正演模拟获得的槽波波场过于理想化,与现场采集槽波数据存在一定偏差.针对煤矿实际采集的典型槽波数据,采用时频域极化滤波方法,利用槽波数据中的纵波在波传播方向能量最强、垂直方向能量最弱的特点,将目前国内煤矿常用的德国SUMMIT槽波地震仪水平双分量检波器接收到的信号,校正到平行波传播方向和垂直波传播方向,有利于判定地震波极化运动特征.经过槽波波场分离,得到三个特征明显的波组,按照时间到达先后顺序,认为分别是折射纵波、瑞利型槽波和勒夫型槽波.其中折射纵波传播速度最快,在共炮点道集上表现为双曲线特征;瑞利型槽波主频最低,水平平行分量和垂直分量都能接收到;勒夫型槽波振动方向垂直波传播方向,只在检波器水平垂直分量有显示.There are many types of seismic waves in the in-seam seismic data that collected in the coal mine. There is controversy about these wave groups. The channel wave seismic wavefield obtained from forward modeling is too idealistic,and there is a certain deviation from field collection channel wave data. According to the typical channel wave data collected in the coal mine,using time-frequency polarization filtering method, the seismic signal recorded by horizontal double-component geophone of Germany SUMMIT channel wave seismograph is corrtected to the horiziontal parallel and vertical component based on the characteristics of Pwave in the channel wave data with the strongest energy in wave propagation direction and the weakest energy in vertical direction.Which is helpful to determine the seismic wave polarization vibration characteristics. After wavefield separation of in-seam seismic data,three distinct wave gourps are obtained according to arrival time,which are refraction P-wave, Rayleigh channel wave and Love channel wave. The refraction P-wave propagates at the fastest speed with hyperbola characteristic on the common shot gathers. Rayleigh channel wave dominant frequency is the lowest, which can be recorded both on parallel and vertical components. Love channel wave vibration direction is in vertical wave propagation,which can be identified on horiziontal vertical components of geophones.

关 键 词：槽波 透射法 波场 分离 极化 

分 类 号：P631[天文地球—地质矿产勘探]