Abstract
The Middle Jurassic Hutton Sandstone oil accumulation at the Bodalla South oilfield in the Eromanga Basin, Australia is primarily a structural trap with stratigraphic control. In common with many others in this basin it does not appear to be full to the structural spill point. Analysis of mercury injection curves has revealed that the caprock of the Hutton Sandstone (i.e. the Birkhead Formation, which is predominantly a lithic sandstone) is a membrane type seal. The calculated maximum size of oil column that will accumulate beneath this caprock is 12.64 m and the maximum oil column encountered to date is 11.25 m. There is no waste zone above the Hutton Sandstone reservoir at Bodalla South.
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