Publication Name: PESA's Eastern Australasian Basin Symposium II
Authors: N. Ceglar, M.R.W. Reilly, T.H.D. Payenberg and S.C. Lang
Date Published: December 2004
Number of Pages: 28
Reference Type: Book Section
Abstract:Outcrop analogues are important for providing quantitative data on reservoir geometry and connectivity at a scale below seismic resolution. The Donkey Bore Syncline of the Northern Flinders Ranges, Australia, hosts outcropping Early Cambrian deepwater facies adjacent to a salt diapir. These outcrops are useful as an analogue for sand-prone successions deposited in deepwater, at or below storm wave base.
Detailed outcrop mapping, combined with stratigraphic logs and spectral gamma logs measured along the eastern limb of the Donkey Bore Syncline, has enabled a multi-storey sand prone succession and its more distal equivalents to be studied along strike for approximately 5 km. Measured stratigraphic sections of up to 85 m (true thickness) through the succession reveal three main sandstone beds of up to 3.5 min thickness. These sandstone beds are massive, moderately sorted, medium-grained sandstone with up to 26% porosity and are interpreted as deposits of sandy debris flows. Thinner sandstone, siltstone and interbedded sandstone-siltstone beds that range from 5 to 80 em thick, separate the thicker sandstone beds. Outcrop data combined with spectral gamma ray measurements and petrographic analyses provide an understanding of the sub-seismic scale architecture and reservoir properties of this confined, sand-prone submarine succession.