Cargando…

A New First Break Picking for Three-Component VSP Data Using Gesture Sensor and Polarization Analysis

A new first break picking for three-component (3C) vertical seismic profiling (VSP) data is proposed to improve the estimation accuracy of first arrivals, which adopts gesture detection calibration and polarization analysis based on the eigenvalue of the covariance matrix. This study aims at address...

Descripción completa

Detalles Bibliográficos
Autores principales: Li, Huailiang, Tuo, Xianguo, Shen, Tong, Wang, Ruili, Courtois, Jérémie, Yan, Minhao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5621385/
https://www.ncbi.nlm.nih.gov/pubmed/28925981
http://dx.doi.org/10.3390/s17092150
_version_ 1783267749583126528
author Li, Huailiang
Tuo, Xianguo
Shen, Tong
Wang, Ruili
Courtois, Jérémie
Yan, Minhao
author_facet Li, Huailiang
Tuo, Xianguo
Shen, Tong
Wang, Ruili
Courtois, Jérémie
Yan, Minhao
author_sort Li, Huailiang
collection PubMed
description A new first break picking for three-component (3C) vertical seismic profiling (VSP) data is proposed to improve the estimation accuracy of first arrivals, which adopts gesture detection calibration and polarization analysis based on the eigenvalue of the covariance matrix. This study aims at addressing the problem that calibration is required for VSP data using the azimuth and dip angle of geophones, due to the direction of geophones being random when applied in a borehole, which will further lead to the first break picking possibly being unreliable. Initially, a gesture-measuring module is integrated in the seismometer to rapidly obtain high-precision gesture data (including azimuth and dip angle information). Using re-rotating and re-projecting using earlier gesture data, the seismic dataset of each component will be calibrated to the direction that is consistent with the vibrator shot orientation. It will promote the reliability of the original data when making each component waveform calibrated to the same virtual reference component, and the corresponding first break will also be properly adjusted. After achieving 3C data calibration, an automatic first break picking algorithm based on the autoregressive-Akaike information criterion (AR-AIC) is adopted to evaluate the first break. Furthermore, in order to enhance the accuracy of the first break picking, the polarization attributes of 3C VSP recordings is applied to constrain the scanning segment of AR-AIC picker, which uses the maximum eigenvalue calculation of the covariance matrix. The contrast results between pre-calibration and post-calibration using field data show that it can further improve the quality of the 3C VSP waveform, which is favorable to subsequent picking. Compared to the obtained short-term average to long-term average (STA/LTA) and the AR-AIC algorithm, the proposed method, combined with polarization analysis, can significantly reduce the picking error. Applications of actual field experiments have also confirmed that the proposed method may be more suitable for the first break picking of 3C VSP. Test using synthesized 3C seismic data with low SNR indicates that the first break is picked with an error between 0.75 ms and 1.5 ms. Accordingly, the proposed method can reduce the picking error for 3C VSP data.
format Online
Article
Text
id pubmed-5621385
institution National Center for Biotechnology Information
language English
publishDate 2017
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-56213852017-10-03 A New First Break Picking for Three-Component VSP Data Using Gesture Sensor and Polarization Analysis Li, Huailiang Tuo, Xianguo Shen, Tong Wang, Ruili Courtois, Jérémie Yan, Minhao Sensors (Basel) Article A new first break picking for three-component (3C) vertical seismic profiling (VSP) data is proposed to improve the estimation accuracy of first arrivals, which adopts gesture detection calibration and polarization analysis based on the eigenvalue of the covariance matrix. This study aims at addressing the problem that calibration is required for VSP data using the azimuth and dip angle of geophones, due to the direction of geophones being random when applied in a borehole, which will further lead to the first break picking possibly being unreliable. Initially, a gesture-measuring module is integrated in the seismometer to rapidly obtain high-precision gesture data (including azimuth and dip angle information). Using re-rotating and re-projecting using earlier gesture data, the seismic dataset of each component will be calibrated to the direction that is consistent with the vibrator shot orientation. It will promote the reliability of the original data when making each component waveform calibrated to the same virtual reference component, and the corresponding first break will also be properly adjusted. After achieving 3C data calibration, an automatic first break picking algorithm based on the autoregressive-Akaike information criterion (AR-AIC) is adopted to evaluate the first break. Furthermore, in order to enhance the accuracy of the first break picking, the polarization attributes of 3C VSP recordings is applied to constrain the scanning segment of AR-AIC picker, which uses the maximum eigenvalue calculation of the covariance matrix. The contrast results between pre-calibration and post-calibration using field data show that it can further improve the quality of the 3C VSP waveform, which is favorable to subsequent picking. Compared to the obtained short-term average to long-term average (STA/LTA) and the AR-AIC algorithm, the proposed method, combined with polarization analysis, can significantly reduce the picking error. Applications of actual field experiments have also confirmed that the proposed method may be more suitable for the first break picking of 3C VSP. Test using synthesized 3C seismic data with low SNR indicates that the first break is picked with an error between 0.75 ms and 1.5 ms. Accordingly, the proposed method can reduce the picking error for 3C VSP data. MDPI 2017-09-19 /pmc/articles/PMC5621385/ /pubmed/28925981 http://dx.doi.org/10.3390/s17092150 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Huailiang
Tuo, Xianguo
Shen, Tong
Wang, Ruili
Courtois, Jérémie
Yan, Minhao
A New First Break Picking for Three-Component VSP Data Using Gesture Sensor and Polarization Analysis
title A New First Break Picking for Three-Component VSP Data Using Gesture Sensor and Polarization Analysis
title_full A New First Break Picking for Three-Component VSP Data Using Gesture Sensor and Polarization Analysis
title_fullStr A New First Break Picking for Three-Component VSP Data Using Gesture Sensor and Polarization Analysis
title_full_unstemmed A New First Break Picking for Three-Component VSP Data Using Gesture Sensor and Polarization Analysis
title_short A New First Break Picking for Three-Component VSP Data Using Gesture Sensor and Polarization Analysis
title_sort new first break picking for three-component vsp data using gesture sensor and polarization analysis
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5621385/
https://www.ncbi.nlm.nih.gov/pubmed/28925981
http://dx.doi.org/10.3390/s17092150
work_keys_str_mv AT lihuailiang anewfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT tuoxianguo anewfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT shentong anewfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT wangruili anewfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT courtoisjeremie anewfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT yanminhao anewfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT lihuailiang newfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT tuoxianguo newfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT shentong newfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT wangruili newfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT courtoisjeremie newfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis
AT yanminhao newfirstbreakpickingforthreecomponentvspdatausinggesturesensorandpolarizationanalysis