Global Geology 2021, 24(2) 103-110 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
 ray-tracing based inversion
FDTD
rough surface
common offset
GPR data
reflection amplitude
Authors
XUE Meiqi
LIU Sixin
LU Qi
LI Hongqing
WANG Yuanxin
CHANG Xinghao
RAN Limin
ZHAO Yonggang and LI Jianwei
PubMed
Article by XM
Article by Liu S
Article by Lu Q
Article by Li H
Article by Wang Y
Article by Chang X
Article by Ran L
Article by Zhao YALJ

 Common offset ground penetrating radar data inversion based on ray theory

 XUE Meiqi,LIU Sixin,LU Qi,LI Hongqing,WANG Yuanxin,CHANG Xinghao,RAN Limin,ZHAO Yonggang and LI Jianwei

 1. College of Geo-Exploration Science and Technology,Jilin University,Changchun 130026,China;

2. North China Petroleum Engineering Company,SINOPEC,Zhengzhou 457000,China

Abstract

 The authors use the common offset ground penetrating radar ( GPR) data inversion based on ray theory to estimate interval velocity and to obtain the relative permittivity. In the ray-tracing based inversion,the input data are the offset distance between antennas,the velocity of the first layer,the pick-up amplitude and reference amplitude of each reflection layer. The thickness and velocity of each layer are calculated by this recursive method. Firstly,the horizontal homogeneous layered medium model is established,and the ideal inversion results are obtained. Subsequently,Monte Carlo method is used to establish a randomly undulating homogeneous layered medium model. The common offset GPR data for the built geological model is then simulated by finite-difference time-domain ( FDTD) . It proved that this ray-tracing based inversion method is feasible for the horizontal layered geological model,even the layered geological model with random undulation. Undulation,represented

by RMS height and CL ( correlation length) ,influences the inversion results. Finally,a more complex geological model--pinch-out model was established. In the pinch-out model,the pinch-out interface can be clearly identified,though there is a false anomaly,which will not significantly affect the identification of the underground medium structure.

Keywords  ray-tracing based inversion   FDTD   rough surface   common offset   GPR data   reflection amplitude  
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