Compensating attenuation effects in full-waveform inversion with dissipation-dispersion decoupling
- Formerly The Pennsylvania State University, Department of Geosciences, University Park, Pennsylvania, USA, presently Chevron, Houston, Texas, USA. (corresponding author); OSTI
- The Pennsylvania State University, Department of Geosciences, University Park, Pennsylvania, USA.
Seismic attenuation poses challenges to velocity model building from acoustic/elastic full-waveform inversion (FWI). In particular, when constructing the FWI gradient for velocity inversion, recent studies have indicated that the high-attenuation structure could distort the gradient by damping the amplitudes and shifting the kinematic phases, resulting in an imbalanced update and thus unreliable velocity model. These Q effects are particularly significant in the reflection acquisition geometry due to the “double-damping” issue. Here, we develop a Q-compensated FWI algorithm for constructing a Q-free FWI gradient. By using a recently developed viscoacoustic wave propagator, this compensation can be done conveniently by keeping the dispersion term and flipping the dissipation term in the wave equation when we simulate the forward and time-reversed adjoint wavefields. The resultant gradient obtained by interacting these two wavefields has correct kinematics and Q-free amplitudes. This Q-compensated FWI can balance the update between Q- and no- Q-areas, which we determine using synthetic examples. In addition, we illustrate how to take advantage of the dissipation-dispersion decoupling to determine the anomalous Q value in the Q model building workflow via Q-compensated reverse time migration.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States); Rice Univ., Houston, TX (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- DOE Contract Number:
- FE0031544; FE0032058
- OSTI ID:
- 2418155
- Journal Information:
- Geophysics, Journal Name: Geophysics Journal Issue: 5 Vol. 88; ISSN 0016-8033
- Publisher:
- Society of Exploration Geophysicists
- Country of Publication:
- United States
- Language:
- English
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