An integrated approach to determining 4D stress development at Castle Cove
Hugo B. Burgin A C , Khalid Amrouch A , Philippe Robion B and David Kulikowski AA Australian School of Petroleum, University of Adelaide, North Tce, 5005, Adelaide, Australia.
B Geosciences et Environnement University of Cergy-Pontoise, 33 Boulevard du Port, 95000 Cergy-Pontoise, France.
C Corresponding author. Email: hugo.burgin@adelaide.edu.au
The APPEA Journal 59(1) 410-425 https://doi.org/10.1071/AJ18173
Submitted: 7 December 2018 Accepted: 1 March 2019 Published: 17 June 2019
Abstract
Models for basin evolution and natural fracture development often contain many uncertainties. Multiscale approaches to structural analysis assist in reducing these by providing checkpoints for structural evolution to better constrain the development of paleostress phases through time. In this study, we integrate the analysis of calcite twins, magnetic fabrics, stylolites and natural fractures at Castle Cove in the eastern Otway Basin, producing a five-phase model for stress evolution consisting of: phase 1 ~NW–SE Mid-Cretaceous strike-slip or compression; phases 2 and 3 Late Cretaceous extension, coinciding with the development of ~NW–SE and ~NE–SW striking extensional fracture sets; phase 4 ~NE–SW strike-slip and compression, representing an enigmatic period of stress evolution with respect to the current understanding of the Otway Basin; and phase 5, present day ~NW–SE strike-slip stress. The results contribute to a 4D structural history construction for the eastern Otway Basin and suggest that the evolution of the region may require reassessing in order to determine the timing and nature of the detected ~NE–SW oriented compressional event. This study also demonstrates how the use of a calcite stress inversion technique can assist in providing mechanical checkpoints for the evolution of complex natural fracture networks, which can easily be expanded within the sub-surface.
Keywords: calcite, fracture, Otway Basin, paleostress, tectonic.
Hugo Burgin is a PhD candidate at the Australian School of Petroleum and an awardee of the Australian Endeavour Research Fellowship in 2017 and the AAPG Grants in Aid Scheme in 2018. His interests include structural geology and petroleum geoscience. He is entering the Australian oil and gas industry in 2019 as a Graduate Geoscientist with ExxonMobil. |
Dr Khalid Amrouch is a structural geologist with expertise in geomechanics. He graduated from the University of Pierre and Marie Curie (Paris VI) with a MSc and a PhD in structural geology. His main interests relate to brittle tectonics, fracture characterisation and 4D stress analyses. Khalid started his career in 2005 at the Institut Français du Pétrole, which sponsored his studies, followed in 2010 by a position as a Research Engineer at Mines PariTech. In 2012, Khalid spent one year working for BHP as an Exploration Geologist in Chile, before joining the Australian School of Petroleum in February 2013. Since then, Khalid has been an active member of the S3 Research Group, one of the largest geoscience research groups at the University of Adelaide. |
Dr Philippe Robion is a Senior Lecturer in Geoscience at the Department of Geosceience and Environment at the Université of Cergy-Pontoise in Paris. He has skills and expertise within structural geology, tectonics and basin analysis, with a focus on microstructural analysis techniques and the anisotropy of physical and mechanical properties of geomaterials. |
Dr David Kulikowski recently completed his PhD in structural geology and geophysics from the Australian School of Petroleum, University of Adelaide. His PhD was titled "Modern Structural Analysis of Subsurface Provinces: A Case Study on the Cooper and Eromanga Basins, Australia" and involved the analysis of micro-, meso- and macros-scale data obtained through geophysics or core analysis. He produced nine first author papers (published in highly respected journals, such as Tectonics, Marine & Petroleum Geology, Journal of Structural Geology, Australian Journal of Earth Sciences and Geophysical Prospecting, to name a few) and contributed to several other papers as a co-author. He was awarded the Dean's Commendation for Doctoral Thesis Excellence and was nominated by both of his PhD reviewers for the University Doctoral Research Medal. David currently works at Woodside Energy in an exploration role. |
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