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Numerical modelling of overpressure generation in deep basins and response of Arctic gas hydrate to ocean warming

Numerical modelling of overpressure generation in deep basins and response of Arctic gas hydrate to ocean warming
Numerical modelling of overpressure generation in deep basins and response of Arctic gas hydrate to ocean warming
This thesis is split into the two scientific topics studied; overpressure development in deep basins and present-day and future gas hydrate dissociation in the Arctic.

Locating and quantifying overpressure is essential to understand basin evolution and hydrocarbon migration in deep basins and thickly sedimented continental margins. The first part of this thesis develops two new methods, including an inverse model, to impose seismic and geological constraints on models of overpressure generated by the disequilibrium compaction and aquathermal expansion mechanisms. The results provide greater understanding of a low velocity zone (LVZ), inferred from wide-angle seismic data, in the centre of the Eastern Black Sea Basin (EBSB). The application of both methods in the study area indicate that the LVZ located within the Maikop formation, at ~3500-6500 m depth below the seabed (mbsf), is linked to overpressure generated, mainly, by disequilibrium compaction. The results suggest that the relatively low vertical and horizontal permeabilites of the Maikop formation of ~1-5x10
Marin-Moreno, Hector
d1daa2dc-3ece-4b9b-914a-0e463b77d414
Marin-Moreno, Hector
d1daa2dc-3ece-4b9b-914a-0e463b77d414
Minshull, Timothy
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Edwards, Rosemary
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Marin-Moreno, Hector (2014) Numerical modelling of overpressure generation in deep basins and response of Arctic gas hydrate to ocean warming. University of Southampton, Ocean and Earth Science, Doctoral Thesis, 215pp.

Record type: Thesis (Doctoral)

Abstract

This thesis is split into the two scientific topics studied; overpressure development in deep basins and present-day and future gas hydrate dissociation in the Arctic.

Locating and quantifying overpressure is essential to understand basin evolution and hydrocarbon migration in deep basins and thickly sedimented continental margins. The first part of this thesis develops two new methods, including an inverse model, to impose seismic and geological constraints on models of overpressure generated by the disequilibrium compaction and aquathermal expansion mechanisms. The results provide greater understanding of a low velocity zone (LVZ), inferred from wide-angle seismic data, in the centre of the Eastern Black Sea Basin (EBSB). The application of both methods in the study area indicate that the LVZ located within the Maikop formation, at ~3500-6500 m depth below the seabed (mbsf), is linked to overpressure generated, mainly, by disequilibrium compaction. The results suggest that the relatively low vertical and horizontal permeabilites of the Maikop formation of ~1-5x10

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Published date: February 2014
Organisations: University of Southampton, Geology & Geophysics

Identifiers

Local EPrints ID: 364170
URI: http://eprints.soton.ac.uk/id/eprint/364170
PURE UUID: 8561dca4-044a-4135-8f9e-9d99f49a66d1
ORCID for Timothy Minshull: ORCID iD orcid.org/0000-0002-8202-1379

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Date deposited: 07 Apr 2014 14:27
Last modified: 06 Jun 2018 12:53

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