Journal ArticleDOI
Wave-equation angle-based illumination weighting for optimized subsalt images
TLDR
The wave-equation angle-based illumination workflow is developed for improving seismic depth images generated in areas of complex structure, such as subsalt and weights down poorly illuminated areas while preserving strongly illuminated areas, opposite to the compensation methods.Abstract:
A methodology has been developed for improving seismic depth images generated in areas of complex structure, such as subsalt. The main goal of the wave-equation angle-based illumination workflow is to calculate a set of illumination weight gathers and apply them to migrated field angle gathers. To obtain meaningful illumination weight gathers, it is important to use the field-acquisition geometry information, migration velocity models, and interpreted horizons. The workflow is model based and requires horizons conformable to real structure, preferably picked on the field seismic depth images. The workflow is implemented using one-way and two-way wave-equation methods and is tested on narrow-azimuth towed-streamer (NATS) and merged NATS with wide-azimuth towed-streamer (XWATS) data sets. The method weights down poorly illuminated areas while preserving strongly illuminated areas, which is opposite to the compensation methods. As a result, an overall improvement in seismic depth images can be obser...read more
Citations
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Journal ArticleDOI
Imaging with primaries and free-surface multiples by joint least-squares reverse time migration
TL;DR: This work has developed a modified modeling operator that uses the data as an areal source in joint LSRTM to account for the free-surface multiples in the data and formulates the imaging problem as an inversion problem to attenuate crosstalk artifacts in the image.
Journal ArticleDOI
Illumination compensation for image-domain wavefield tomography
TL;DR: This work addressed the uneven illumination problem of image-domain wavefield tomography by incorporating the illumination effects into the penalty operator such that only the defocusing by model errors was used for model construction.
Journal ArticleDOI
Acquisition aperture correction in the angle domain toward true-reflection reverse time migration
TL;DR: In this paper, a dip-angle domain amplitude correction was derived from the resolution theory, where the stacked migration image created by reverse time migration was decomposed into common dip images, which were compensated individually by the corresponding amplitude correction factor.
Proceedings ArticleDOI
Improving Subsalt Imaging With Illumination-based Weighting of RTM 3D Angle Gathers
TL;DR: In this article, the availability of wide azimuth (WAZ) data and reverse time migration (RTM) boost the ability to image subsalt structures in the Gulf of Mexico (GOM) exploration.
Journal ArticleDOI
Staining algorithm for seismic modeling and migration
Bo Chen,Xiaofeng Jia +1 more
TL;DR: In this article, an extension of the wavefield to the complex domain was proposed to improve the signal-to-noise ratio (S/N) in poorly illuminated areas of the model, where all structures except for the target were transparent to the imaginary wavefield which is excited only when the real wavefront arrives at the target structure.
References
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Journal ArticleDOI
Angle-domain common-image gathers by wavefield continuation methods
Paul Sava,Sergey Fomel +1 more
TL;DR: This work presents a method for computing angle-domain common-image gathers from seismic images obtained by depth migration using wavefield continuation, which amounts to a radial-trace transform in the Fourier domain and is equivalent to a slant stack in the space domain.
Journal ArticleDOI
An overview of depth imaging in exploration geophysics
TL;DR: In this paper, the authors describe the progress made in depth migration to the present and the most significant barriers to attaining its inversion goals in the future, and discuss some of the obstacles to reaching the point where seismic images can provide quantitatively accurate descriptions of rocks and fluids.
Journal ArticleDOI
The Wave Equation Applied to Migration
TL;DR: Claerbout's method has been implemented for the migration of stacked seismic data as discussed by the authors, and a simplified description of the method is given together with an account of some of the practical programming problems and the types of inaccuracy encountered.
Proceedings ArticleDOI
Wave-equation-based Illumination Determination For Amplitude Versus Angle Risk Assessment
Proceedings ArticleDOI
Acquisition of 2D walkaway VSP data to provide improved imaging of the Thunder Horse North field, Gulf of Mexico
TL;DR: In this article, a 2D Vertical Seismic Profile (VSP) was designed and successfully completed in one of the Thunder Horse North development wells, and the VSP image was found to be much superior to available surface seismic data.