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Keywords: waveform inversion
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Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583355
... Aiming at the need of exploration targets of shale reservoirs which are highly heterogeneous vertically and horizontally, we have improved the prestack waveform inversion method by assuming a locally horizontal structure for every common mid/conversion point location to depict the spatial...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583870
... We developed a viscoelastic waveform inversion (VWI) method to invert 1D P-wave velocity and attenuation ( Q ) models and source parameters using zero-offset vertical seismic profile (VSP) data. The method employs a ray-based waveform computation and combines objective functions of time...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581908
... Accurate source estimation is an important component in full waveform inversion (FWI). A conventional approach to determine the signature employs transfer function estimation between the observed and modelled data. Depending on the scenario, this might lead to a biased signature due to lacking...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583403
... Misfit functions based on differentiable dynamic time warping (DTW) have demonstrated an excellent performance in various sequence-related tasks. We introduce this concept in the context of waveform inversion and discuss a fast algorithm to calculate the first and second derivatives...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3584030
... Wavefield solutions are critical for applications ranging from imaging to full waveform inversion. These wavefields are often large, especially for 3D media, and multiple point sources, like Green’s functions. A recently introduced framework based on neural networks admitting functional...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583961
... migration demigration source reconstruction reservoir characterization extended fwi correlation receiver exploration geophysicist 10 reconstruction inversion hessian artificial intelligence scattered-field equation waveform inversion full-waveform inversion fwi gradient equation...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594635
... inversion (FWI) is a constrained optimization of them are reviewed here. The adaptive waveform inversion problem that draw inferences about high resolution subsurface (AWI) (Warner and Guasch, 2016) uses Wiener lters to push parameters by matching the recorded and the simulated seis- predicted data toward...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594686
... We demonstrate that an appropriate combination of adaptive waveform inversion (AWI) (Guasch et al., 2019), kinematic reflection waveform inversion (RWI) (Warner et al., 2018), and quantum particle-swarm global optimization (qPSO) (Debens et al., 2015), is able to generate accurate wellresolved...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424509
... An extremely simple single-trace transmission example shows how an extended source formulation of full waveform inversion can produce an optimization problem without spurious local minima (“cycle skipping”). The data consist of a single trace recorded at a given distance from a point source...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424666
... Near-surface velocity model building is an key problem for subsequent seismic imaging and waveform inversion. Based on a unified seismic wave forward engine, a new first arrival multi-information joint inversion method is proposed to cope with this problem. In our joint inversion method...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3425103
... We propose a receiver-extension approach to full waveform inversion, which, contrary to source-extension methods, can be used directly with a time-domain formulation. We introduce the receiver position as the extension parameter. We use a nested loop strategy to minimize the resulting misfit...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428421
... Full waveform inversion by model extension (FWIME) coupled with a model-space multi-scale approach has the potential to become a robust acoustic-velocity model-building algorithm. It combines the robustness of wave-equation migration velocity analysis (MVA) with the accuracy of full waveform...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427918
... Full waveform inversion (FWI) has recently received lots of attention for microseismic event characterization. However, FWI with unknown sources becomes severely underdetermined, hence requiring strong prior information. The frequency-domain wavefield inversion method (WRI) has shown promising...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427933
... We present Lift and Relax for Waveform Inversion (LRWI), an approach that mitigates the cycle-skipping issue in full waveform inversion via a combination of two convexification techniques. The first technique (Lift) extends the set of variables in the optimization problem to products of those...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428070
... Time-lapse seismic data are widely used to monitor reservoir changes; waveform inversion methods are now being applied to these problems. A popular time-lapse waveform inversion strategy is the double-difference time-lapse waveform inversion (DDWI) (inversion of the difference data starting from...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427524
... We demonstrate that acoustic full-waveform inversion (FWI), using transmitted ultrasound, is able to reconstruct accurate high-resolution images of the human brain in three dimensions in a way that would be entirely familiar to most geophysicists. Imaging the brain through the bones of the skull...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-W06-04
...Full waveform inversion using multiples and primaries Yike Liu*, Bin He, Institute of Geology and Geophysics, Chinese Academy of Sciences; and Yingcai Zheng, University of Houston Summary primary reflections and can provide additional illumination in the shadow zones of primary reflections. Unlike...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3425737
... Detection of the property changes in the subsurface during production is important, yet it is also very challenging considering that these changes are often very settle. The quantitative evaluation of the subsurface property obtained by full waveform inversion (FWI) allows for better monitoring...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427176
... The reflection waveform inversion (RWI) using the tomographic term of the sensitivity kernel could be an alternative to full waveform inversion (FWI), especially in the deep target area where diving wave is not available. In RWI, the reflection waveform residuals are minimized to invert...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427730
...: 11:00 AM Location: 351D Presentation Type: Oral reservoir characterization frequency selection relaxation optimization problem objective function waveform inversion artificial intelligence constraint conventional fwi wri upstream oil & gas initial model wavefield inversion...

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