Definition of a fault permeability predictor from outcrop studies of a faulted turbidite sequence, Taranaki, New Zealand

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Title: Definition of a fault permeability predictor from outcrop studies of a faulted turbidite sequence, Taranaki, New Zealand
Authors: Childs, Conrad
Walsh, John J.
Manzocchi, Tom
Strand, Julian
Nicol, Andrew
Tomasso, Mark
Schöpfer, Martin P. J.
Aplin, Andrew C.
Permanent link: http://hdl.handle.net/10197/3031
Date: 2007
Abstract: Post-depositional normal faults within the turbidite sequence of the Late Miocene Mount Messenger Formation of the Taranaki basin, New Zealand are characterised by granulation and cataclasis of sands and by the smearing of clay beds. Clay smears maintain continuity for high ratios of fault throw to clay source bed thickness (c. 8), but are highly variable in thickness, and gaps occur at any point between the clay source bed cutoffs at higher ratios. Although cataclastic fault rock permeabilities may be significantly lower (c. 2 orders of magnitude) than host rock sandstone permeabilities, the occurrence of continuous clay smears, combined with low clay permeabilities (10's to 100's nD) means that the primary control on fault rock permeability is clay smear continuity. A new permeability predictor, the Probabilistic Shale Smear Factor (PSSF), is developed which incorporates the main characteristics of clay smearing from the Taranaki Basin. The PSSF method calculates fault permeabilities from a simple model of multiple clay smears within fault zones, predicting a more heterogeneous and realistic fault rock structure than other approaches (e.g. Shale Gouge Ratio, SGR). Nevertheless, its averaging effects at higher ratios of fault throw to bed thickness provide a rationale for the application of other fault rock mixing models, e.g. SGR, at appropriate scales.
Funding Details: Not applicable
Type of material: Book Chapter
Publisher: Geological Society, London
Copyright (published version): 2007 The Geological Society of London
Keywords: FaultPermeabilityPredictorTaranaki
Subject LCSH: Faults (Geology)--New Zealand
Turbidites
Rocks--Permeability
Permeability--Forecasting
DOI: 10.1144/​SP292.14
Language: en
Status of Item: Peer reviewed
Is part of: Jolley, S. J. et al (eds.). Structurally complex reservoirs
Appears in Collections:Earth Sciences Research Collection

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