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1. Tassone, David Ronald. Compressional deformation and exhumation in sedimentary basins at ‘passive’ continental margins, with implications for hydrocarbon exploration and development.

Degree: 2014, University of Adelaide

There is growing recognition that extensive phases of compressional deformation and exhumation have interrupted the post-rift subsidence histories of some economically important ‘passive’ continental margins. Understanding the distribution, magnitude, chronology and causes of exhumation and compressional deformation at these margins can reduce exploration uncertainty. The Otway and Faroe-Shetland basins along the southern Australian margin and northwest European Atlantic ‘passive’ margins, respectively, provide ideal natural laboratories to further understand syn and post-rift compressional deformation, inversion and exhumation. Post-Albian exhumation in the Otway Basin was quantified to be ~400-3600 m across the eastern and northern parts of basin using a new sonic transit time-depth trend, which represents normal compaction of volcaniclastic shales deposited within a fluvio-lacustrine environment – unlike any other such trends previously published. These estimates are consistent with those from complementary thermal, palynological and seismic datasets. Whilst the impacts of exhumation are well known for conventional hydrocarbon systems, this study is amongst the first to highlight the implications of exhumation on unconventional hydrocarbon systems, in particular related to petrographical and geomechanical rock properties. Exhumation in the Otway Basin is mainly related to mid-Cretaceous and Neogene neotectonic compressional deformation and inversion episodes, with the latter strongly governed by the contemporary stress state. Using complementary geophysical datasets and considering lithological heterogeneity, basement fabrics and variations in structural style with depth – factors generally neglected in previous geomechanical-focused studies in this region – it is possible to better understand the relationship between neotectonic deformation and stress. Comparisons between bulk crustal strain rates based on Neogene shortening estimates, and present-day strain rates of based on earthquake data and geological observations demonstrates that strain rates in the Otway Basin have declined since the onset of Neogene compressional deformation and exhumation. Neogene bulk crustal strain rates determined independently from shortening estimates and exhumation magnitudes yield similar results, suggesting that Neogene exhumation in the eastern Otway Basin can be accounted for solely by crustal shortening within a mildly compressional intraplate stress field, with ~30% of the total present-day strain rate accounted for by aseismic deformation. In the central parts of the offshore Otway Basin, where there is very thick preserved Upper Cretaceous sequence and few indications of major post-Albian tectonic activity, significant and previously unreported overpressures are examined. Pore pressure gradients exceed ~16 MPa/km within the fine-grained Upper Cretaceous Belfast and Flaxman formations, and are most likely due to a disequilibrium compaction associated with Pliocene burial by a proto-Murray River discharge. Estimating… Advisors/Committee Members: Holford, Simon Paul (advisor), King, Rosalind Clare (advisor), Hillis, Richard Ralph (advisor), Green, Paul F. (advisor), Duddy, Ian R. (advisor), Stoker, Martyn S. (advisor), Australian School of Petroleum (school).

Subjects/Keywords: exhumation; compression; deformation; continental margins

…the University of Adelaide and where applicable, any partner institution responsible for the… …Australian School of Petroleum, The University of Adelaide, as well as some of the opportunities to… 

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APA (6th Edition):

Tassone, D. R. (2014). Compressional deformation and exhumation in sedimentary basins at ‘passive’ continental margins, with implications for hydrocarbon exploration and development. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/90331

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Tassone, David Ronald. “Compressional deformation and exhumation in sedimentary basins at ‘passive’ continental margins, with implications for hydrocarbon exploration and development.” 2014. Thesis, University of Adelaide. Accessed December 06, 2019. http://hdl.handle.net/2440/90331.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Tassone, David Ronald. “Compressional deformation and exhumation in sedimentary basins at ‘passive’ continental margins, with implications for hydrocarbon exploration and development.” 2014. Web. 06 Dec 2019.

Vancouver:

Tassone DR. Compressional deformation and exhumation in sedimentary basins at ‘passive’ continental margins, with implications for hydrocarbon exploration and development. [Internet] [Thesis]. University of Adelaide; 2014. [cited 2019 Dec 06]. Available from: http://hdl.handle.net/2440/90331.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tassone DR. Compressional deformation and exhumation in sedimentary basins at ‘passive’ continental margins, with implications for hydrocarbon exploration and development. [Thesis]. University of Adelaide; 2014. Available from: http://hdl.handle.net/2440/90331

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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