High gas hydrate and free gas concentrations: An explanation for seeps offshore south mocha island

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dc.contributor.authorVargas-Cordero, Iván
dc.contributor.authorVillar-Muñoz, Lucía
dc.contributor.authorBento, Joaquim P.
dc.contributor.authorTinivella, Umberta
dc.date.accessioned2022-06-28T21:25:44Z
dc.date.available2022-06-28T21:25:44Z
dc.date.issued2018-11
dc.descriptionIndexación Scopuses
dc.description.abstractRecent studies have reported cold seeps offshore of Mocha Island. Gas hydrate occurrences along the Chilean margin could explain seeps presence. Gas-phase (gas hydrate and free gas) and geothermal gradients were estimated analysing two seismic sections. Close to Mocha Island (up to 20 km) were detected high (up to 1900 m/s) and low (1260 m/s) velocities associated with high gas hydrate (up to 20% of total volume) and free gas (up to 1.1% of total volume) concentrations, respectively. A variable and high geothermal gradient (65-110 °C/km) was obtained. These results are related to high supply of deep fluids canalised by faults and fractures. Faraway from Mocha Island (>60 km), free gas concentrations decrease to 0.3% of total volume and low geothermal gradient (from 35 to 60 °C/km) are associated with low fluids supply. Finally, we propose gas hydrate dissociation processes as the main supply source for seeps in the vicinity of Mocha Island. These processes can be caused by: (a) active faults and seismic activity; and (b) warm fluid expulsion from deeper zones altering hydrate stability conditions. In both cases, gas hydrate dissociation could generate slope instability and landslides, as occurred in the past in this region and reported in the literature. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.es
dc.description.urihttps://www.mdpi.com/1996-1073/11/11/3062
dc.identifier.citationEnergies Volume 11, Issue 11November 2018 Article number 3062es
dc.identifier.doi10.3390/en11113062
dc.identifier.issn19961073
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/23042
dc.language.isoenes
dc.publisherMDPI AGes
dc.rights.licenseCC BY 4.0
dc.subjectMethane Hydratees
dc.subjectEnergy Resourcees
dc.subjectRecoveryes
dc.subjectBottom simulating reflector (BSR)es
dc.subjectGas hydratees
dc.subjectMocha Islandes
dc.titleHigh gas hydrate and free gas concentrations: An explanation for seeps offshore south mocha islandes
dc.typeArtículoes
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