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Structural and petrophysical effects of overthrusting on highly porous sandstones; the Aztec Sandstone in the Buffington Window, SE Nevada, USA

Luisa F. Zuluaga, Haakon Fossen, Gregory Ballas and Atle Rotevatn
Structural and petrophysical effects of overthrusting on highly porous sandstones; the Aztec Sandstone in the Buffington Window, SE Nevada, USA (in Subseismic-scale reservoir deformation, M. Ashton (editor), S. J. Dee (editor) and O. P. Wennberg (editor))
Special Publication - Geological Society of London (April 2017) 459 (1): 59-77

Abstract

Little is known about the effect of thrusting on lithological and petrophysical properties of reservoir sandstone. Here we use field observations, probe permeability measurements and thin-section analysis along ten transects from the Muddy Mountain thrust contact downwards into the underlying Jurassic Aztec Sandstone to evaluate the nature and extent of petrophysical and microstructural changes caused by the thrusting. The results reveal a decimetre- to metre-thick low-permeable (< or =50 mD) and indurated (0-3% porosity) zone immediately beneath the thrust contact in which dominant microscale processes, in decreasing order of importance, are (1) cataclasis with local fault gouge formation; (2) pressure solution; and (3) very limited cementation. From this narrow zone the petrophysical and microstructural effect of the thrusting decreases gradually downwards into a friable, highly porous (c. 25%) and permeable (< or =2 D) sandstone some 50-150 m below the thrust, in which strain is localized into deformation band populations. In general, the petrophysical properties of the sandstone as a result of overthrusting reveal little impact in overall primary reservoir quality below some tens of metres into the footwall, except for the relatively minor baffling effect of deformation bands.


ISSN: 0305-8719
EISSN: 2041-4927
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 459
Serial Issue: 1
Title: Structural and petrophysical effects of overthrusting on highly porous sandstones; the Aztec Sandstone in the Buffington Window, SE Nevada, USA
Title: Subseismic-scale reservoir deformation
Author(s): Zuluaga, Luisa F.Fossen, HaakonBallas, GregoryRotevatn, Atle
Author(s): Ashton, M.editor
Author(s): Dee, S. J.editor
Author(s): Wennberg, O. P.editor
Affiliation: University of Bergen, Department of Earth Science, Bergen, Norway
Pages: 59-77
Published: 20170427
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 42
Accession Number: 2017-041936
Categories: Sedimentary petrologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., block diag., 1 table, geol. sketch map
N36°00'00" - N36°30'00", W115°00'00" - W114°25'00"
Secondary Affiliation: Institut Francais de Recherche pour l'Exploitation de la Mer, FRA, France
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201723
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