TY - JOUR
T1 - Automatic picking of the first arrival event using the unwrapped-phase of the Fourier transformed wavefield
AU - Choi, Yun Seok
AU - Alkhalifah, Tariq Ali
AU - Saragiotis, Christos
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2012/5/25
Y1 - 2012/5/25
N2 - 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. © 2011 Society of Exploration Geophysicists.
AB - 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. © 2011 Society of Exploration Geophysicists.
UR - http://hdl.handle.net/10754/561694
UR - http://library.seg.org/doi/abs/10.1190/1.3627521
UR - http://www.scopus.com/inward/record.url?scp=84857615416&partnerID=8YFLogxK
U2 - 10.1190/1.3627521
DO - 10.1190/1.3627521
M3 - Article
SN - 1052-3812
VL - 30
SP - 1653
EP - 1657
JO - SEG Technical Program Expanded Abstracts 2011
JF - SEG Technical Program Expanded Abstracts 2011
IS - 1
ER -