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Keywords: reverse time migration
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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-2021-3583931
... Compared with Least-squares reverse time migration (LSRTM), plane-wave least-squares reverse time migration (PLSRTM) can effectively reduce the computational cost. However, the application of encoding brings aliasing artifacts to the imaging results. One advantage of PLSRTM is that, the take-off...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3567601
... of wave fields in inhomogeneous media Gaussian beam approach: Geophysical Journal International, 70, 109 128, doi: httpsdoi.org/10.1111/j.1365-246X.1982.tb06394.x. Dai, W., P. Fowler, and G. Schuster, 2012, Multi-source least-squares reverse time migration: Geophysical Prospecting, 60, 681 695, doi...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3567608
... In viscoacoustic reverse-time migration (RTM), attenuation compensation can be implemented by reversing the sign of the dissipation term and keeping the dispersion term unchanged for backward wavefield extrapolation. Although the Q-compensated RTM scheme can effectively correct attenuation...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583091
... PP/PS images and ADCIGs are calculated and compared. reservoir characterization imaging condition wavefield exploration geophysicist 10 reverse time migration upstream oil & gas parameterization expanded abstract ps image applied geoscience scalar imaging condition geophysics...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583348
... directly to separate the field data, which are acquired from Liaohe River Basin, China. Clear separation in the data space and a high quality acoustic reverse time migration image demonstrated that the proposed training dataset building strategy is a key factor to the success of field data applications...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583518
... seismic and synthetic were observed, Shell’s least-squares reverse time migration (LSRTM) technology was used to improve the amplitude fidelity for amplitude versus offset (AVO) analysis and inversion in the sub-salt. Elastic attributes such as Acoustic Impedance (AI) and Vp/Vs were used for stratigraphic...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3593905
... We introduce a practical vector operator of reflection demigration of PP and PS waves, and develop a vector elastic least-squares reverse-time migration (LSRTM) method for PP and PS reflectivity imaging. The timedomain demigration operator and the vector elastic reversetime migration (RTM...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581036
... Two common issues of Least-squares Reverse Time Migration (LSRTM) consist in the large number of iterations required to produce notable subsurface imaging improvements and the difficulty of choosing adequate regularization strategies with optimal hyper-parameters. We investigate how supervised...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581142
... geophysicist 10 reverse time migration upstream oil & gas wavefield geophysics supergather chinese academy imaging reflection encoded multiple yingcai zheng crosstalk artifact reservoir characterization shot gather migration order multiple crosstalk Reverse time migration of phase...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427091
... data. Considering the fact that velocity errors are inevitable for field data application, it is better to utilize least-squares reverse time migration with subsurface offset extension (LSERTM) because of its good property of preserving data information in the extended domain. LSERTM has been actively...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424632
... imaging condition, a transition between the excitation amplitude and the crosscorrelation imaging conditions, for reverse time migration (RTM) to relax the limitation. For one spatial node, we merely correlate the forward and backward records in a local time window, which is corresponding times...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424784
... Imaging of crustal-scale complex structures causing subduction zones namely major faults, low-velocity zones and steep dips is a challenge in seismic exploration. Various depth imaging techniques including Kirchhoff migration, reverse time migration (RTM), etc. have been utilized to reconstruct...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428152
... Least-squares reverse time migration (LSRTM) has demonstrated its capability of inverting the high wavenumber components of models on synthetic data. However, for real data applications, the improvement of image quality becomes subtle due to inaccurate velocities. To alleviate this problem, we...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427595
... applied in a new 3D anisotropic reverse time migration (RTM), which has been tested on 3D synthetic SEAM data and field data. As a result, seismic images with high resolution are produced. Benchmarks against commercial implementations are also demonstrated, which proves that the positioning of structure...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427971
... In shallow water seismic surveys with coarse acquisition grids, primary energy is poorly sampled, which can adversely affect preprocessing steps (e.g., up-down wavefield separation, demultiple), and conventional velocity model building and imaging tools like tomography and reverse time migration...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427469
... We present an accelerated least-squares reverse time migration (LSRTM) approach based on optimal mini-batch shot selection. This selection strategy uses an illumination metric to select subsets (mini-batches) of shots that are critical to illuminating an area of interest. Illumination...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427177
... Least-squares reverse-time migration (LSRTM) based on reflection demigration is a linear inversion-based imaging method toward true reflectivity. We develop a new preconditioner for LSRTM with a supervised machine learning (ML) method, i.e. Support Vector Machine (SVM), to automatically...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427717
... Reverse time migration (RTM) has been the primary choice to obtain reliable seismic imaging in complex geological regions such as the Gulf of Mexico. Although the commercial application of RTM goes back over a decade, the pursuit for high-frequency images, ~50 Hz or greater, are still rare due...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427796
... In this paper, we discuss the properties of the waveform impedance sensitivity kernel for elastic reverse time migration. A connection is made between the elastic energy norm imaging condition and the impedance sensitivity kernel. It is shown analytically that the imaging condition using...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426539
... on our training dataset performs well both in training and testing datasets. We also make further verifications from the view of acoustic reverse time migration. The separated waves by using NN trained on our training datasets have a considerable high-resolution PP and PS imaging. Presentation Date...

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