Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/70987
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Type: Journal article
Title: Overpressures in the central Otway Basin: the result of rapid Pliocene-Recent sedimentation?
Author: Tassone, D.
Holford, S.
Tingay, M.
Tuitt, A.
Stoker, M.
Hillis, R.
Citation: Australian Petroleum Production and Exploration Association (APPEA) Journal, 2011; 2011(1):439-458
Publisher: Australian Petroleum Production and Exploration Association
Issue Date: 2011
ISSN: 1326-4966
Statement of
Responsibility: 
D. Tassone, S. Holford, M. Tingay, A. Tuitt, M. Stoker and R. Hillis
Abstract: This 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.
Keywords: Overpressure
sonic velocity
disequilibrium compaction
net exhumation
Otway Basin
Rights: © Media Dynamics 2011
DOI: 10.1071/aj10028
Description (link): http://mdpublic.com/APPEA11Abs/intro.php?ref=100819-09
Published version: http://dx.doi.org/10.1071/aj10028
Appears in Collections:Aurora harvest 5
Australian School of Petroleum publications

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