Common-reflection-surface-based prestack diffraction separation and imaging
Diffraction imaging can lead to high-resolution characterization of small-scale subsurface structures. A key step of diffraction imaging and tomography is diffraction separation and enhancement, especially in the full prestack data volume. In this work, we consider point diffractors and present a ro...
| Main Authors: | , , , |
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| Format: | Journal article |
| Published: |
Society of Exploration Geophysicists
2017
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| _version_ | 1797053422524956672 |
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| author | Bakhtiari Rad, P Schwarz, B Gajewski, D Vanelle, C |
| author_facet | Bakhtiari Rad, P Schwarz, B Gajewski, D Vanelle, C |
| author_sort | Bakhtiari Rad, P |
| collection | OXFORD |
| description | Diffraction imaging can lead to high-resolution characterization of small-scale subsurface structures. A key step of diffraction imaging and tomography is diffraction separation and enhancement, especially in the full prestack data volume. In this work, we consider point diffractors and present a robust and fully data-driven workflow for prestack diffraction separation based on wavefront attributes, which are determined using the common-reflectionsurface (CRS) method. In a first of two steps, we apply a zero-offset based extrapolation operator for prestack diffraction separation, which combines the robustness and stability of the zero-offset CRS processing with enhanced resolution and improved illumination of the finite-offset CRS processing. In the second step, when finite-offset diffracted events are separated, we apply a diffraction-based time migration velocity model building which provides high-quality diffraction velocity spectra. Applications of the new workflow to 2D / 3D complex synthetic data confirm the superiority of the prestack diffraction separation over the poststack method as well as the high potential of diffractions for improved time imaging. |
| first_indexed | 2024-03-06T18:43:31Z |
| format | Journal article |
| id | oxford-uuid:0db5f649-4384-48ad-9b36-777b31c41f1d |
| institution | University of Oxford |
| last_indexed | 2024-03-06T18:43:31Z |
| publishDate | 2017 |
| publisher | Society of Exploration Geophysicists |
| record_format | dspace |
| spelling | oxford-uuid:0db5f649-4384-48ad-9b36-777b31c41f1d2022-03-26T09:42:03ZCommon-reflection-surface-based prestack diffraction separation and imagingJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0db5f649-4384-48ad-9b36-777b31c41f1dSymplectic Elements at OxfordSociety of Exploration Geophysicists2017Bakhtiari Rad, PSchwarz, BGajewski, DVanelle, CDiffraction imaging can lead to high-resolution characterization of small-scale subsurface structures. A key step of diffraction imaging and tomography is diffraction separation and enhancement, especially in the full prestack data volume. In this work, we consider point diffractors and present a robust and fully data-driven workflow for prestack diffraction separation based on wavefront attributes, which are determined using the common-reflectionsurface (CRS) method. In a first of two steps, we apply a zero-offset based extrapolation operator for prestack diffraction separation, which combines the robustness and stability of the zero-offset CRS processing with enhanced resolution and improved illumination of the finite-offset CRS processing. In the second step, when finite-offset diffracted events are separated, we apply a diffraction-based time migration velocity model building which provides high-quality diffraction velocity spectra. Applications of the new workflow to 2D / 3D complex synthetic data confirm the superiority of the prestack diffraction separation over the poststack method as well as the high potential of diffractions for improved time imaging. |
| spellingShingle | Bakhtiari Rad, P Schwarz, B Gajewski, D Vanelle, C Common-reflection-surface-based prestack diffraction separation and imaging |
| title | Common-reflection-surface-based prestack diffraction separation and imaging |
| title_full | Common-reflection-surface-based prestack diffraction separation and imaging |
| title_fullStr | Common-reflection-surface-based prestack diffraction separation and imaging |
| title_full_unstemmed | Common-reflection-surface-based prestack diffraction separation and imaging |
| title_short | Common-reflection-surface-based prestack diffraction separation and imaging |
| title_sort | common reflection surface based prestack diffraction separation and imaging |
| work_keys_str_mv | AT bakhtiariradp commonreflectionsurfacebasedprestackdiffractionseparationandimaging AT schwarzb commonreflectionsurfacebasedprestackdiffractionseparationandimaging AT gajewskid commonreflectionsurfacebasedprestackdiffractionseparationandimaging AT vanellec commonreflectionsurfacebasedprestackdiffractionseparationandimaging |