Overpressures in the central Otway Basin: the result of rapid Pliocene-Recent sedimentation?

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dc.contributor.authorTassone, D.
dc.contributor.authorHolford, S.
dc.contributor.authorTingay, M.
dc.contributor.authorTuitt, A.
dc.contributor.authorStoker, M.
dc.contributor.authorHillis, R.
dc.date.issued2011
dc.description.abstractThis paper reports the first evidence for significant overpressures in the Otway Basin, southern Australia, where most previous studies have assumed near-hydrostatic pore pressures. Overpressures are observed in the Upper Cretaceous Shipwreck supersequence in several wells in the Voluta Trough, such as Bridgewater Bay–1, Normanby–1 and Callister–1. One of these wells penetrated successions of Pliocene-Recent marine clastic sediments nearly 700 m thick that were deposited rapidly in submarine channels and that were probably carved during the late-Miocene to early-Pliocene. Wireline and drilling data suggest that overpressures present in Upper Cretaceous shales and sandstones in the Belfast Mudstone and Flaxman and Waarre formations developed either due to disequilibrium compaction—where there is no evidence of hydrocarbon generation and thick Pliocene stratigraphy is present—or due to fluid expansion where there is evidence of hydrocarbon generation and the Pliocene stratigraphy is thin to absent. The two key factors that may indicate abnormal pore pressures in Upper Cretaceous sediments in the central Otway Basin are the thickness of Pliocene stratigraphy and whether or not hydrocarbons are actively generating from source rocks.
dc.description.statementofresponsibilityD. Tassone, S. Holford, M. Tingay, A. Tuitt, M. Stoker and R. Hillis
dc.description.urihttp://mdpublic.com/APPEA11Abs/intro.php?ref=100819-09
dc.identifier.citationAustralian Petroleum Production and Exploration Association (APPEA) Journal, 2011; 2011(1):439-458
dc.identifier.doi10.1071/aj10028
dc.identifier.issn1326-4966
dc.identifier.orcidHolford, S. [0000-0002-4524-8822]
dc.identifier.orcidStoker, M. [0000-0002-5314-0950]
dc.identifier.orcidHillis, R. [0000-0002-5222-7413]
dc.identifier.urihttp://hdl.handle.net/2440/70987
dc.language.isoen
dc.publisherAustralian Petroleum Production and Exploration Association
dc.rights© Media Dynamics 2011
dc.source.urihttps://doi.org/10.1071/aj10028
dc.subjectOverpressure
dc.subjectsonic velocity
dc.subjectdisequilibrium compaction
dc.subjectnet exhumation
dc.subjectOtway Basin
dc.titleOverpressures in the central Otway Basin: the result of rapid Pliocene-Recent sedimentation?
dc.typeJournal article
pubs.publication-statusPublished

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