Geoscience Visual Presentation G08: Chemostratigraphy of the Sherbrook Supersequence – 13 wells from the offshore Otway Basin
Merrie-Ellen Gunning A *A
Merrie-Ellen Gunning has an MBA from Melbourne Business School and a Bachelor of Applied Science in Geology from RMIT. M has over three decades of industry experience. Her experience has included postings in and overseeing operations across the world. Since joining Geoscience Australia in 2015 she has worked on prospectivity and CCS projects, and is currently Director – Offshore Energy Systems. |
Abstract
Geoscience Visual Presentation G08
An elemental chemostratigraphic study of the offshore Otway Basin has been undertaken as part of a collaboration between Chemostrat and Geoscience Australia, the main aim of which is to better constrain the sequence boundaries of, and within, the Sherbrook Supersequence. This study includes the elemental analysis of 1185 cuttings samples from the Sherbrook Supersequence (and overlying stratigraphy) in 13 offshore wells. Sampling of cuttings was particularly challenging as many of the targeted wells have a paucity of material available for destructive analysis. Inductively Coupled Plasma-Optical Emission Spectrometry and Mass Spectrometry (ICP-OES and MS) analysis was undertaken to establish a regional elemental chemostratigraphic framework of the Sherbrook Supersequence. The resultant framework comprises two chemostratigraphic sequences, seven chemostratigraphic packages and eighteen chemostratigraphic units. While the analysis could not clearly distinguish the base of the Sherbrook Supersequence it has provided valuable insight into correlations between wells, within the Sherbrook and overlying Wangerrip supersequences. Importantly it has confirmed that in the offshore part of the basin sedimentary processes and inputs remain unchanged from the Shipwreck to the Sherbrook (Turonian–Maastrichtian).
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Keywords: chemostratigraphy, Inductively Coupled Plasma-Optical Emission Spectrometry, Mass Spectrometry, offshore, Otway Basin, Sherbrook Supersequence, Shipwreck Supersequence, Shipwreck trough, Well correlation.
Merrie-Ellen Gunning has an MBA from Melbourne Business School and a Bachelor of Applied Science in Geology from RMIT. M has over three decades of industry experience. Her experience has included postings in and overseeing operations across the world. Since joining Geoscience Australia in 2015 she has worked on prospectivity and CCS projects, and is currently Director – Offshore Energy Systems. |
