Lau, K. W. H. and White, R. S. and Christie, P. A. F. (2010) Integrating streamer and ocean-bottom seismic data AND OCEAN- for sub-basalt imaging on the Atlantic margin. Petroleum Geoscience, 16 (4). pp. 349-366. DOI https://doi.org/10.1144/1354-0793/10-023
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Abstract
Stacked basalt flows cover much of the NW European continental margin, including potentially prospective sediments of the Faroes shelf. Such flows attenuate seismic energy, hindering sub-basalt structural imaging which is critical for both exploration and tectonic studies. Low-frequency, long-offset reflection surveys have yielded improved images below top basalt, while coincident ocean-bottom seismometer (OBS) data have mapped low velocity zones (LVZ) from tomographic inversion. Image correlation in a common depth domain is challenged by low spatial resolution of the tomographic image, the absence of turning rays in a LVZ and the lack of wide-angle arrivals in the reflection data. We integrate densely sampled reflection data with deep velocities from OBS data to give a common velocity model in a new, iterated, pre-stack depth-migration workflow using complementary constraints from the two datasets. The matched velocity model and depth image enable interpretation of (i) a uniform flood basalt sequence, 2–4 km thick beneath the Fugloy Ridge, with velocities correlating with those in the Lopra 1/1A borehole and (ii) a sub-basalt LVZ with chaotic reflections corresponding to sill-intruded, probably syn-rift sediments. Such a workflow could be extended to targets beneath high velocity salt or basalt and could provide constraints for 3D datasets.
Item Type: | Article |
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Additional Information: | Schlumberger, cml |
Uncontrolled Keywords: | 2010AREP; IA61, |
Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
Divisions: | 02 - Geodynamics, Geophysics and Tectonics |
Journal or Publication Title: | Petroleum Geoscience |
Volume: | 16 |
Page Range: | pp. 349-366 |
Identification Number: | https://doi.org/10.1144/1354-0793/10-023 |
Depositing User: | Sarah Humbert |
Date Deposited: | 02 Jul 2010 10:40 |
Last Modified: | 23 Jul 2013 09:57 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/1416 |
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