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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.
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.
Acknowledgements
P. M. Cooney of the Geological Survey of New South Wales arranged access to core at the W. B. Clarke Geoscience Centre, Londonderry. L. Kalnins and S. Franks assisted with the text, data preparation, processing and presentation. The School of Geosciences, University of Sydney, helped with facilities.