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Anisotropy signatures in the Cooper Basin of Australia; stress versus fractures

Stephanie Tyiasning and Dennis Cooke
Anisotropy signatures in the Cooper Basin of Australia; stress versus fractures (in Unconventional exploration and production; achievements and remaining challenges, Huyen Bui (prefacer), Thomas Klopf (prefacer), Hongliu Zeng (prefacer), Robert Wiener (prefacer), Dario Grana (prefacer) and Rodney Johnston (prefacer))
Interpretation (Tulsa) (May 2016) 4 (2): SE51-SE61

Abstract

Theoretically, vertical fractures and stress can create horizontal transverse isotropy (HTI) anisotropy on 3D seismic data. Determining if seismic HTI anisotropy is caused by stress or fractures can be important for mapping and understanding reservoir quality, especially in unconventional reservoirs. Our study area was the Cooper Basin of Australia. The Cooper Basin is Australia's largest onshore oil and gas producing basin that consists of shale gas, basin-centered tight gas, and deep coal play. The Cooper Basin has unusually high tectonic stress, with most reservoirs in a strike-slip stress regime, but the deepest reservoirs are interpreted to be currently in a reverse-fault stress regime. The seismic data from the Cooper Basin exhibit HTI anisotropy. Our main objective was to determine if the HTI anisotropy was stress induced or fracture induced. We have compared migration velocity anisotropy and amplitude variation with offset anisotropy extracted from a high-quality 3D survey with a "ground truth" of dipole sonic logs, borehole breakout, and fractures interpreted from image logs. We came to the conclusion that the HTI seismic anisotropy in our study area is likely stress induced.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 4
Serial Issue: 2
Title: Anisotropy signatures in the Cooper Basin of Australia; stress versus fractures
Title: Unconventional exploration and production; achievements and remaining challenges
Author(s): Tyiasning, StephanieCooke, Dennis
Author(s): Bui, Huyenprefacer
Author(s): Klopf, Thomasprefacer
Author(s): Zeng, Hongliuprefacer
Author(s): Wiener, Robertprefacer
Author(s): Grana, Darioprefacer
Author(s): Johnston, Rodneyprefacer
Affiliation: University of Adelaide, Australian School of Petroleum, Adelaide, South Aust., Australia
Affiliation: Shell International Exploration & Production, Houston, TX, United States
Pages: SE51-SE61
Published: 201605
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 33
Accession Number: 2017-001224
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
S28°45'00" - S27°00'00", E139°30'00" - E142°10'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201701
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