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Modeling fracture propagation and seafloor gas release during seafloor warming-induced hydrate dissociation
Stockholm University, Faculty of Science, Department of Geological Sciences. Center for Coastal and Ocean Mapping/Joint Hydrographic Center, USA.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Number of Authors: 3
2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 16, 8510-8519 p.Article in journal (Refereed) Published
Abstract [en]

The stability of marine methane hydrates and the potential release of methane gas to the ocean and atmosphere have received considerable attention in the past decade. Sophisticated hydraulic-thermodynamic models are increasingly being applied to investigate the dynamics of bottom water warming, hydrate dissociation, and gas escape from the seafloor. However, these models often lack geomechanical coupling and neglect how overpressure development and fracture propagation affect the timing, rate, and magnitude of methane escape. In this study we integrate a geomechanical coupling into the widely used TOUGH+Hydrate model. It is shown that such coupling is crucial in sediments with permeability 10(-16)m(2), as fracture formation dramatically affects rates of dissociation and seafloor gas release. The geomechanical coupling also results in highly nonlinear seafloor gas release, which presents an additional mechanism for explaining the widely observed episodic nature of gas flares from seafloor sediments in a variety of tectonic and oceanographic settings.

Place, publisher, year, edition, pages
2017. Vol. 44, no 16, 8510-8519 p.
Keyword [en]
hydrate, clathrate, dissociation, ocean warming, fracture, dynamics
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-147903DOI: 10.1002/2017GL074349ISI: 000410658800049OAI: oai:DiVA.org:su-147903DiVA: diva2:1150668
Available from: 2017-10-19 Created: 2017-10-19 Last updated: 2017-10-19Bibliographically approved

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Stranne, ChristianO'Regan, MatthewJakobsson, Martin
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