The Narrabeen Group in the east-central Sydney Basin: physical properties and interpretation
Donald W. Emerson 1 David F. Branagan 2 3
+ Author Affiliations
- Author Affiliations
1 Systems Exploration (NSW) Pty Ltd, Box 6001 Dural Del. Centre, NSW 2158, Australia.
2 School of Geosciences, University of Sydney, NSW 2006, Australia.
3 Corresponding author. Email: dbranaga@mail.usyd.edu.au
Exploration Geophysics 42(4) 258-274 https://doi.org/10.1071/EG11011
Submitted: 9 February 2011 Accepted: 31 July 2011 Published: 30 September 2011
Abstract
A mesoscale petrophysics and lithological logging study has been carried out on 413 core samples of the 623 m thick Narrabeen Group succession penetrated by the Eveleigh No. 1 diamond drillhole. Mass properties, magnetic susceptibilities, and electrical estimates of mobile salt (EC 1 : 5 tests) were measured. A physical properties analysis posits a 3-fold subdivision of the succession: basal fluvio-deltaic and alluvial, upper lacustrine, and topmost fluvio-deltaic. Each division has cyclic sedimentation but from different provenances. The analysis has proved useful in the correlation of the Narrabeen Group present in a series of drillholes in the eastern part of the exposed Sydney Basin.
Key words: borehole correlation, Eveleigh DH 1, lithological logging, mesoscale petrophysics.
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