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Keywords: migration
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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426874
... at handling complex velocity models for seismic migrations by a hierarchical- velocity distributions and can be applied where ray-based scale localized spatial function set. The optimum velocity methods are inaccurate. Regardless of the choice of the model is assumed to be the model from such modeling engine...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426941
... velocity model upstream oil & gas reservoir sand obn structural geology infill opportunity migration salt interpretation seg international exposition obn data exploration geophysicist 10 interpretation seismic model resolution auger field identification short turnaround time...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426967
... reservoir characterization image-domain least-square reverse-time migration exploration geophysicist 10 regularization artificial intelligence migration seg international exposition artifact synthetic data psf velocity model hessian reflectivity model upstream oil & gas lsm...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424410
... velocity model mexico marlin dorado field migration exploration geophysicist 10 kirchhoff migration shallow imaging kirchhoff image seg international exposition compensation high resolution imaging kirchhoff migration swing gas sand obn data High-resolution imaging with least-squares Q...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424513
... Location: Poster Station 5 Presentation Type: Poster upstream oil & gas cave ceiling migration seg international exposition reservoir characterization resource in place estimate lidar data geometry estimates of resource in place ground penetrating radar constant velocity migration...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427923
... Seismic amplitudes can be biased by uneven illumination in the presence of a complex overburden. Iterative Least-Squares Migration (LSM) can reduce the amplitude bias and improve the resolution of the images. We introduce a robust and practical iterative least-squares migration for the inversion...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428147
... Reverse time migration (RTM) is capable of imaging the underground structures even in complex geological conditions. However, RTM does not guarantee a migration result with accurate amplitude and high resolution. Therefore, Least-Squares RTM methods are developed to reduce migration artifacts...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427641
... characterization schlumberger-private migration seg international exposition constrain brazil upstream oil & gas narrow-azimuth dataset exploration geophysicist 10 tomography ls rtm expanded abstract pre-salt image quantitative interpretation Squeezing out the pre-salt image from a narrow...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3425808
... Seismic imaging algorithms face significant practical and numerical challenges when migrating multicomponent seismic data acquired from irregular topography. Most of these issues can be avoided by abandoning the Cartesian coordinate system and migrating the data in a generalized topographic...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427456
... Using common reflection angle migration (CRAM) which is an advanced beam migration, we successfully improved signal-to-noise ratio (SNR) and image continuity in the volcanic reservoir, offshore Myanmar. In this field, seismic imaging is challenging because high impedance contrast at the top...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-W06-02
...Structure constrained least-squares migration of total reflection and its applications Cheng Cheng*, Yang He, Jian Mao, Bin Wang (TGS) Introduction consisting of both primaries and multiples acts as full wavefield data for inversion. Since the inverted full Least-squares imaging of primary...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3423961
... We consider the problem of image domain least squares migration (LSM) based on local Hessian construction. In the proposed approach, both the image and the Hessian are constructed using beams. Specifically, we use the ultra-wide-band phase space beam summation method. In this method, the beams...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427411
... Seismic source localization plays an important role in estimating the hypocenter of earthquakes and in monitoring hydraulic fracturing. Interferometric cross-correlation migration (ICCM) is one of the most important waveformbased source location methods that produces source image from...
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-2020-3427474
... and introducing uncertainty in further quantitative analysis. To handle the illumination challenges associated with a narrow-azimuth seismic data, prestack least-squares reverse time migration (LSRTM) is applied. Herein, we discuss the workflow as well as the challenges associated with its practical application...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3425618
... imaging condition ray-based kirchhoff migration exploration geophysicist 10 traveltime computation kwett sog ray tracing seg international exposition image stack reservoir characterization wave equation velocity model traveltime map conventional ray-based kirchhoff migration...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428300
... horizons, followed by Kirchhoff depth migration to apply a cascaded image-domain subtraction workflow. This strategy is effective to better subtract the multiples, decreasing the risk associated with reservoir mapping by using the migrated models for interpretation support. The study shows a practical case...
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-2020-3427858
... Full wavefield data that includes transmitted waves, primary reflections, and their multiples, has been widely used for velocity model building through full-waveform inversion (FWI). However, migrating full wavefield data to image the subsurface remains very challenging. Higher order scattering...

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