Abstract
First-arrival picking has long suffered from cycle skipping, especially when the first arrival is contaminated with noise or have experienced complex near surface phenomena. We propose a new algorithm for automatic picking of first arrivals using an approach based on unwrapping the phase. We unwrap the phase by taking the derivative of the Fourier-transformed wavefield with respect to the angular frequency and isolate its amplitude component. To do so, we first apply a damping function to the seismic trace, calculate the derivative of the wavefield with respect to the angular frequency, divide the derivative of wavefield by the wavefield itself, and finally take its imaginary part. We compare our derivative approach to the logarithmic one and show that the derivative approach does not suffer from the phase wrapping or cycle-skipping effects. Numerical examples show that our automatic picking algorithm gives convergent and reliable results for the noise-free synthetic data and noisy field data.
Original language | English (US) |
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Title of host publication | Society of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011 |
Publisher | Society of Exploration Geophysicists |
Pages | 1653-1657 |
Number of pages | 5 |
ISBN (Print) | 9781618391841 |
State | Published - 2011 |
Event | Society of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011 - San Antonio, United States Duration: Sep 18 2011 → Sep 23 2011 |
Publication series
Name | Society of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011 |
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Conference
Conference | Society of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011 |
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Country/Territory | United States |
City | San Antonio |
Period | 09/18/11 → 09/23/11 |
Bibliographical note
Publisher Copyright:© 2011 SEG.
ASJC Scopus subject areas
- Geophysics