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RESEARCH ARTICLE

Determining paleo-structural environments through natural fracture and calcite twin analyses: a case study in the Otway Basin, Australia

Hugo B. Burgin A B , Khalid Amrouch A , Mojtaba Rajabi A , David Kulikowski A and Simon P. Holford A
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A Australian School of Petroleum, University of Adelaide, North Terrace, Adelaide, SA 5005, Australia.

B Corresponding author. Email: hugo.burgin@adelaide.edu.au

The APPEA Journal 58(1) 238-254 https://doi.org/10.1071/AJ17099
Submitted: 11 December 2017  Accepted: 30 January 2018   Published: 28 May 2018

Abstract

The structural history of the Otway Basin has been widely studied; however, previous works have focussed on large kilometre scale, basin and seismic structures, or have over-simplified natural fracture analysis with an excessive focus on fracture strike direction and a disregard for 3D geometry, a crucial characteristic when considering states of stress responsible for natural fracture formation. In this paper, we combine techniques of natural fracture analysis and calcite twin stress inversion to investigate the meso (outcrop and borehole) and micro (crystal) scale evidence for structural environments that have contributed to basin evolution. Our results indicate that basin evolution during the post-Albian may be markedly more complex than the previously thought stages of late Cretaceous inversion, renewed rifting and long-lived mid-Eocene to recent compression, with evidence for up to six structural environments detected across the basin, including; NE–SW and NW–SE extension, NW–SE compression, a previously undetected regime of NE–SW compression, and two regimes of strike-slip activity. By constraining structural environments on the meso- and micro-scale we can deliver higher levels of detail into structural evolution, which in turn, provides better-quality insights into multiple petroleum system elements, including secondary migration pathways and trap formation. Our research also shows that the Otway Basin presents a suitable environment for additional micro-scale structural investigations through calcite twin analyses.

Keywords: basin analysis, tectonic, paleo-stress, structure.

Hugo Burgin is a PhD candidate at the Australian School of Petroleum. An awardee of an Australian Endeavour Research Fellowship in 2017, his PhD is focussed on paleo-stress analyses within Australia’s Otway Basin. His interests include structural geology, petrophysics and geomechanics.

Khalid Amrouch is a structural geologist with expertise in geomechanics. He graduated from the University of Pierre and Marie Curie (Paris VI) with an MSc and a PhD in structural geology. His main interest relates to brittle tectonics, fracture characterisation and 4D stress analyses. Khalid started his career in 2005 at the Institut Français du Pétrole (IFP), which sponsored his studies, followed in 2010 by a position as research engineer at Mines PariTech. In 2012, Khalid spent 1 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.

Mojtaba Rajabi is a research associate at the Australian School of Petroleum, University of Adelaide. He is currently the Deputy Head of the World Stress Map project. His research interests are petroleum geomechanics, petrophysics and tectonic evolution of sedimentary basins. Mojtaba graduated with a PhD in Petroleum Geoscience from the Australian School of Petroleum in 2016. He has worked on the Australian Stress Map and the World Stress Map projects in Australia and Germany since 2012. Member: AAPG, ASEG, EAGE, EGU, IAMG, PESA, SEG, SPE and SPWLA.

David Kulikowski recently completed his PhD in structural geology and geophysics from the Australian School of Petroleum, University of Adelaide. His PhD was entitled ‘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 nominated by both of his PhD reviewers for the University Doctoral Research Medal. David currently works at Woodside Energy in an Exploration role.

Simon Holford is an Associate Professor at the Australian School of Petroleum, the University of Adelaide. He graduated with a BSc (Hons) from Keele University (2001) and a PhD from the University of Birmingham (2006). His research interests are in the deformation, uplift and magmatic evolution of rifted margins, sedimentary basins, and continental interiors and their impact on hydrocarbon exploration. Member: AAPG, AGU, GSA, GSL, PESA.


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