The kinetics and mechanics of a dehydrating system and the deformation of porous rock


Bedford, JD ORCID: 0000-0002-2077-4797 (2017) The kinetics and mechanics of a dehydrating system and the deformation of porous rock. PhD thesis, University of Liverpool.

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Abstract

This thesis aims to address two distinct areas of Earth Sciences that are linked by common processes. The first is dehydration reactions at intermediate depths that lead to seismicity, and the second is the mechanics of the deformation of porous sandstones which is important for the development of sub-surface reservoirs. The breakdown of hydrous minerals in subduction zones is often invoked as the cause of seismicity at intermediate depths (50-200 km). The release of high pressure fluid is thought to reduce effective stress allowing brittle deformation at pressures where instabilities are typically supressed. Pore fluid pressure (Pf) evolution is dependent on the feedback between reaction rate, fluid flow and deformation. Reaction generates fluid which, if unable to drain, will lead to an increase in Pf. However dehydration reactions are also typically associated with (i) solid volume reduction which produces porosity, enhancing fluid flow and allowing high Pf to dissipate, and (ii) compaction of this pore space that can restrict fluid flow enabling Pf to build up. This thesis aims to constrain the processes that control the reaction rate, and hence the fluid production rate, and also determine the deformation ... (continues)

Item Type: Thesis (PhD)
Divisions: Faculty of Science and Engineering > School of Environmental Sciences
Depositing User: Symplectic Admin
Date Deposited: 14 Dec 2017 16:02
Last Modified: 27 Aug 2025 04:43
DOI: 10.17638/03009159
Supervisors:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3009159
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