Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 214, Issue 3, Pages 1701-1714Publisher
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggy227
Keywords
Gas and hydrate systems; Controlled source electromagnetics; Tomography; Inversion; Marine electromagnetics; Non-linear electromagnetics
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Funding
- Rock Solid Images Ltd.
- University of Southampton
- National Oceanography Centre
- German Research Council
- Wolfson Research Merit Award
- NERC [noc010011] Funding Source: UKRI
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We present high-resolution resistivity imaging of gas hydrate pipe-like structures, as derived from marine controlled-source electromagnetic (CSEM) inversions that combine towed and ocean-bottom electric field receiver data, acquired from the Nyegga region, offshore Norway. 2.5-D CSEM inversions applied to the towed receiver data detected four new prominent vertical resistive features that are likely gas hydrate structures, located in proximity to a major gas hydrate pipe-like structure, known as the CNE03 pockmark. The resistivity model resulting from the CSEM data inversion resolved the CNE03 hydrate structure in high resolution, as inferred by comparison to seismically constrained inversions. Our results indicate that shallow gas hydrate vertical features can be delineated effectively by inverting both ocean-bottom and towed receiver CSEM data simultaneously. The approach applied here can be utilized to map and monitor seafloor mineralization, freshwater reservoirs, CO2 sequestration sites and near-surface geothermal systems.
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