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dc.contributor.authorTingay, Mark
dc.contributor.authorHillis, R.
dc.contributor.authorMorley, C.
dc.contributor.authorSwarbrick, R.
dc.contributor.authorOkpere, E.
dc.contributor.editorP Van Rensbergen, R R Hillis, A J Maltman & C K Morley
dc.identifier.citationTingay, Mark and Hillis, Richard and Morley, Chris and Swarbrick, Richard and Okpere, Eugene. 2003. Pore pressure/stress coupling in Brunei Darussalam - implications for shale injection, in P Van Rensbergen, R R Hillis, A J Maltman & C K Morley (ed), Subsurface Sediment Mobilization. pp. 369-379. Bath UK: Geological Society of London.

Shale dykes, diapirs and mud volcanoes are common in the onshore and offshore regions of Brunei Darussalam. Outcrop examples show that shale has intruded along both faults and tensile fractures. Conventional models of over pressure-induced brittle failure assume that pore pressure and total stresses are independent of one another. However, data worldwide and from Brunei show that changes in pore pressure are coupled with changes in total minimum horizontal stress. The pore pressure/stress-coupling ratio describes the rate of change of minimum horizontal stress magnitude with changing pore pressure. Minimum horizontal stress measurements for a major offshore field where undepleted pore pressures range from normal to highly overpressured show a pore pressure/stress-coupling ratio of 0.59. As a consequence of pore pressure/stress coupling, rocks can sustain a greater increase in pore pressure prior to failure than predicted by the prevailing values of pore pressure and stress. Pore pressure/stress-coupling may favour the formation of tensile fractures with increasing pore pressure rather than reactivation of pre-existing faults. Anthropogenically-induced tensile fracturing in offshore Brunei supports this hypothesis.

dc.publisherGeological Society of London
dc.subjectshale injection
dc.subjectPore pressure
dc.subjectBrunei Darussalam
dc.subjectstress coupling
dc.titlePore pressure/stress coupling in Brunei Darussalam - implications for shale injection
dc.typeBook Chapter
dcterms.source.titleSubsurface Sediment Mobilization
dcterms.source.placeBath UK

Accepted for publication in Subsurface Sediment Mobilization as of 2003.

curtin.accessStatusOpen access
curtin.facultyDepartment of Applied Geology
curtin.facultyFaculty of Science and Engineering
curtin.facultyWA School of Mines

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