TY - GEN
T1 - A Sequential Inversion for the Velocity and the Intrinsic Attenuation Using Efficient Wavefield Inversion
AU - Song, Chao
AU - Alkhalifah, Tariq Ali
N1 - KAUST Repository Item: Exported on 2021-03-25
Acknowledgements: We thank KAUST for its support and the SWAG group for the collaborative environment. We thank the Center for Subsurface Imaging and Modeling (CSIM) group releasing the viscoacoustic Marmousi model.
PY - 2020
Y1 - 2020
N2 - Full-waveform inversion (FWI) has become a popular method to retrieve high-resolution subsurface
model parameters. An accurate simulation of wave propagation plays an important role in achieving
better data fitting. For intrinsically attenuative media, wave propagation experiences dispersion and loss
of energy. Thus, it is sometimes crucial to consider the intrinsic attenuation of the Earth in the FWI
implementation. Viscoacoustic FWI aims at achieving a joint inversion of the velocity and attenuative
models. However, multiparameter FWI imposes additional challenges including expanding the null
space problem and the parameter trade-off issue. We use an efficient wavefield inversion (EWI) method
to invert for the velocity and the intrinsic attenuation, sequentially. This approach is implemented in the
frequency domain, and the velocity, in this case, is complex-valued in the viscoacoustic EWI. The
inversion for the velocity and the intrinsic attenuation is handled in separate optimizations. As
viscoacoustic EWI is able to recover a good velocity model, the velocity update leakage to the Q model
is largely reduced. We show the effectiveness of this approach using synthetic data generated for a
viscoacoustic Marmousi model.
AB - Full-waveform inversion (FWI) has become a popular method to retrieve high-resolution subsurface
model parameters. An accurate simulation of wave propagation plays an important role in achieving
better data fitting. For intrinsically attenuative media, wave propagation experiences dispersion and loss
of energy. Thus, it is sometimes crucial to consider the intrinsic attenuation of the Earth in the FWI
implementation. Viscoacoustic FWI aims at achieving a joint inversion of the velocity and attenuative
models. However, multiparameter FWI imposes additional challenges including expanding the null
space problem and the parameter trade-off issue. We use an efficient wavefield inversion (EWI) method
to invert for the velocity and the intrinsic attenuation, sequentially. This approach is implemented in the
frequency domain, and the velocity, in this case, is complex-valued in the viscoacoustic EWI. The
inversion for the velocity and the intrinsic attenuation is handled in separate optimizations. As
viscoacoustic EWI is able to recover a good velocity model, the velocity update leakage to the Q model
is largely reduced. We show the effectiveness of this approach using synthetic data generated for a
viscoacoustic Marmousi model.
UR - http://hdl.handle.net/10754/668220
UR - https://www.earthdoc.org/content/papers/10.3997/2214-4609.202010177
U2 - 10.3997/2214-4609.202010177
DO - 10.3997/2214-4609.202010177
M3 - Conference contribution
BT - EAGE 2020 Annual Conference & Exhibition Online
PB - European Association of Geoscientists & Engineers
ER -