Kumar, Priyadarshi Chinmoy, Alves, Tiago M. ORCID: https://orcid.org/0000-0002-2765-3760 and Sain, Kalachand 2021. Submarine canyon systems focusing sub-surface fluid in the Canterbury Basin, South Island, New Zealand. Scientific Reports 11 , 16990. 10.1038/s41598-021-96574-3 |
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Abstract
This work uses a high-quality 3D seismic volume from offshore Canterbury Basin, New Zealand, to investigate how submarine canyon systems can focus sub-surface fluid. The seismic volume was structurally conditioned to improve the contrast in seismic reflections, preserving their lateral continuity. It reveals multiple pockmarks, eroded gullies and intra-slope lobe complexes occurring in association with the Waitaki Submarine Canyon. Pockmarks are densely clustered on the northern bank of the canyon and occur at a water depth of 500–900 m. In parallel, near-seafloor strata contain channel-fill deposits, channel lobes, meandering channel belts and overbank sediments deposited downslope of the submarine canyon. We propose that subsurface fluid migrates from relatively deep Cretaceous strata through shallow channel-fill deposits and lobes to latter seep out through the canyon and associated gullies. The new, reprocessed Fluid Cube meta-attribute confirms that fluids have seeped out through the eroded walls of the Waitaki Canyon, with such a seepage generating seafloor depressions in its northern bank. Our findings stress the importance of shallow reservoirs (channel-fill deposits and lobes) as potential repositories for fluid, hydrocarbons, or geothermal energy on continental margins across the world.
Item Type: | Article |
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Date Type: | Published Online |
Status: | Published |
Schools: | Earth and Environmental Sciences |
Additional Information: | Tis article is licensed under a Creative Commons Attribution 4.0 International License |
Publisher: | Nature Research |
ISSN: | 2045-2322 |
Date of First Compliant Deposit: | 15 September 2021 |
Date of Acceptance: | 5 August 2021 |
Last Modified: | 03 May 2023 01:42 |
URI: | https://orca.cardiff.ac.uk/id/eprint/144157 |
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