High-resolution resistivity imaging of marine gas hydrate structures by combined inversion of CSEM towed and ocean-bottom receiver data.

Attias, Eric, Weitemeyer, Karen, Hölz, Sebastian , Naif, Samer, Minshull, Tim A, Best, Angus I, Haroon, Amir, Jegen-Kulcsar, Marion and Berndt, Christian (2018) High-resolution resistivity imaging of marine gas hydrate structures by combined inversion of CSEM towed and ocean-bottom receiver data. Open Access Geophysical Journal International, 214 (3). pp. 1701-1714. DOI 10.1093/gji/ggy227.

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Supplementary data:

Abstract

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. Two-dimensional 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 utilised to map and monitor seafloor mineralisation, freshwater reservoirs, CO2 sequestration sites and near-surface geothermal systems.

Document Type: Article
Additional Information: This article has been accepted for publication in Geophysical Journal Internationa ©: 2018 [owner as specified on the article] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: Gas and hydrate systems, CSEM, Simultaneous inversion, Tomography
Research affiliation: NOC
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1093/gji/ggy227
ISSN: 0956-540X
Projects: COSY
Expeditions/Models/Experiments:
Date Deposited: 26 Jun 2018 08:45
Last Modified: 01 Feb 2019 15:01
URI: http://oceanrep.geomar.de/id/eprint/43497

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