First-arrival traveltime inversion with embedded boundary method for irregular topography

Title
First-arrival traveltime inversion with embedded boundary method for irregular topography
Author(s)
Park, Yunhui; Pyun, Sukjoon
KIOST Author(s)
Park, Yun Hui(박윤희)
Publication Year
2020-10-14
Abstract
The first-arrival traveltime tomography (FATT) is an inversion method which represents shallow velocities so that it is widely used to identify subsurface images in oil and gas industry as well as civil engineering and geotechnical industries. The provided shallow velocity can be generally utilized for static correction which is necessary for land seismic data processing. Land data, which involve elevation variations, require to consider irregular topography carefully when performing the wave-equation-based traveltime tomography. In this study, in order to express the irregular topography, embedded boundary method (EBM) is incorporated into our traveltime calculation method which is based on damped wavefields from wave equation modeling. EBM can precisely construct irregular surface of numerical models on regular mesh by exploiting the mirror imaging method and Lagrangian interpolation. Through numerical examples and field data, the developed techniques are demonstrated. First of all, using a homogeneous velocity having slanted surface, the EBM-based traveltime calculation method is validated. The results show that our EBM-based traveltime calculation is no longer affected by the staircase approximation. Additionally, using field data which are obtained from mountainous area, the EBM-based FATT is carried out to estimate the shallow velocity. The inverted velocity is then used to apply static correction to the field data in a simple manner. The processing results show that the continuities of seismic events are improved which can claim the accurateness of our FATT method.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/37661
Bibliographic Citation
SEG 2020 Annual Meeting, 2020
Publisher
SEG(Society of Exploration Geophysicists)
Type
Conference
Language
English
Publisher
SEG(Society of Exploration Geophysicists)
Related Researcher
Research Interests

Seismic Data Processing,Subsurface Imaging (Full Waveform inversion and Tomography),Seismic Survey and Marine Data Acquisition,탄성파 자료처리,지하구조 영상화(전파형 역산, 토모그래피),탄성파 탐사 및 해양 자료 취득

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