
%0 Journal Article
%A Wallace, M.W. 
%A Condilis, E. 
%A Powell, A. 
%A Redfearn, J. 
%A Auld, K. 
%A Wiltshire, M. 
%A Holdgate, G. 
%A Gallagher, S. 
%T GEOLOGICAL CONTROLS ON SONIC VELOCITY IN THE CENOZOIC CARBONATES OF THE NORTHERN CARNARVON BASIN, NORTH WEST SHELF, WESTERN AUSTRALIA
%J The APPEA Journal
%D 2003/06/30
%V 43
%N 1
%P 385-399
%K 
%R https://doi.org/10.1071/AJ02020
%U https://www.publish.csiro.au/paper/AJ02020 
%X The Cenozoic carbonates of the Bounty-Talisman region can be divided into five major facies. From oldest to youngest, these are: Paleocene to Eocene basinal facies, Oligocene to Miocene slope-canyon facies, Oligocene to Miocene shelf facies, Oligocene to Miocene near-shore facies, and Pliocene-Quaternary shelf facies. This represents a shallowing-upwards cycle up to the late Miocene, followed by a significant transgression and a return to more open marine conditions in the Pliocene- Quaternary. The dominant geological processes controlling sonic velocity in the Cenozoic carbonates are physical compaction, burial calcite cementation, dolomitisation, and anhydrite/gypsum cementation. In the more open marine facies of the Cenozoic carbonates, compaction and burial calcite cementation have been the dominant geological processes that have controlled sonic velocity. Large-scale carbonate content variations associated with submarine canyon-fill sediments have also produced lateral sonic velocity variations. Dolomitisation and anhydrite cementation have produced localised high velocity zones within the near-shore facies of the carbonates. 
