TY - GEN

T1 - Wave-equation Radon tomography for early arrivals

AU - Ibrahim, Amr

AU - Schuster, Gerard T.

AU - Hanafy, Sherif M.

N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): OCRF-2014-CRG3-2300
Acknowledgements: We thank the sponsors for supporting the Consortium of Subsurface Imaging and Fluid Modeling (CSIM). We also thank KAUST for providing funding by the CRG grant OCRF-2014-CRG3-2300. For computer time, this research used the resources of the Supercomputing Laboratory at KAUST.

PY - 2018/8/27

Y1 - 2018/8/27

N2 - We present the theory of wave-equation Radon tomography (WRT) where the slopes and zero-intercept time of early arrivals in the τ−p domain are inverted for the subsurface velocity structure. The early arrivals are windowed in a shot gather, but they are still too wiggly to avoid local minima with a full waveform inversion (FWI) method. To reduce their complexity, a local linear Radon τ−p transform is applied to the events to focus them into few points. These points, which identify the slopes and zero-intercept time of the early arrivals, are picked to give the slowness coordinate pobs i at the zero-intercept time τ i . The misfit function ε=∑ i=1 P (p i −p i obs )2+∑ i=1 P (τ i −τ i obs )2 is computed and a gradient optimization method is used to find the optimal velocity model that minimizes e. Results with synthetic data and field data show that WRT can accurately reconstruct the nearsurface P-wave velocity model and converges faster than other wave-equation methods.

AB - We present the theory of wave-equation Radon tomography (WRT) where the slopes and zero-intercept time of early arrivals in the τ−p domain are inverted for the subsurface velocity structure. The early arrivals are windowed in a shot gather, but they are still too wiggly to avoid local minima with a full waveform inversion (FWI) method. To reduce their complexity, a local linear Radon τ−p transform is applied to the events to focus them into few points. These points, which identify the slopes and zero-intercept time of the early arrivals, are picked to give the slowness coordinate pobs i at the zero-intercept time τ i . The misfit function ε=∑ i=1 P (p i −p i obs )2+∑ i=1 P (τ i −τ i obs )2 is computed and a gradient optimization method is used to find the optimal velocity model that minimizes e. Results with synthetic data and field data show that WRT can accurately reconstruct the nearsurface P-wave velocity model and converges faster than other wave-equation methods.

UR - http://hdl.handle.net/10754/631206

UR - https://library.seg.org/doi/10.1190/segam2018-2998360.1

UR - http://www.scopus.com/inward/record.url?scp=85059402712&partnerID=8YFLogxK

U2 - 10.1190/segam2018-2998360.1

DO - 10.1190/segam2018-2998360.1

M3 - Conference contribution

SP - 5193

EP - 5197

BT - SEG Technical Program Expanded Abstracts 2018

PB - Society of Exploration Geophysicists

ER -