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Sedimentoloty and Sequence Tratigraphy of the Permain Glacial Succession of the Canning Basin, Australia

Rian Boshoff

Australian School of Petroleum,

The University of Adelaide

Abstract

Glaciogenic deposits are inherently complex and result in relatively heterogeneous reservoirs. The
Permian succession within the Canning Basin, Western Australia, displays evidence of glacial
processes in multiple well locations. The wells chosen for the study all intersect the Permian and
are from the basin margins and provide information on the sequence stratigraphy of the basin on a
regional scale.

The project first researched how glacial deposition, and how glacially influenced & derived
sediments affected reservoir heterogeneity. This research was incorporated to create detailed
sedimentological core descriptions of cores within the Canning Basin. These cores were paired
with wireline data for context.Modern day subsurface analogues aid in the development of
geological and stratigraphic model building. The resultant geological and stratigraphic models
enable users to predict likely reservoir and seal relationships present within the basin.

A full sequence stratigraphic analysis of the basin was not possible due to unlogged cores that held
vital information that wireline data alone could not provide. As a result there could not be a
geological model created for the entire region and a stratigraphic model was also hindered due to
the incomplete sequence stratigraphic analysis.

It is still unclear how many glacial cycles were present in the Canning Basin and to what lateral
extent each cycle extends.

Key findings are that below the initial glacial cycle, stacked distributary channel sands and aeolian
sand beds displayed promising signs as great reservoirs whilst the mud prone glaciomarine
deposits may be good seals due to high mud content within these cycles.
Although failure to construct a geologic and stratigraphic model, the three modern analogues
displayed striking similarities to the Canning Basin and there are promising signs that the glacial
cycles within the Permian resulted in deposits that are laterally extensive and contain
undiscovered reservoirs and seals.

Australian School of Petroleum
THE UNIVERSITY OF ADELAIDE

SA 5005 AUSTRALIA

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