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The Palaeogeography Of Permian Sediments Of The Munkarie And Brumby Gas Fields In The Southern Cooper Basin Utilizing Genetic Sequences Of Strata.

Grasso, Carmine A

Honours Degree, 1986

University of Adelaide

Abstract

Log correlations in conjunction with the principles of Genetic Sequences of Strata (G.S.S.), have been applied to the 15 wells which have penetrated the Permian section in the Munkarie-Brumby Gas Field area, Cooper Basin. The sand isopach and lithofacies maps both demonstrate that the major palaeo-drainage areas (major channel axes) were structurally controlled in the lower units of the Patchawarra Formation.

For the remainder of the Patchawarra Formation and for the Epsilon Formation, Daralingie Beds and Toolachee Formation, both the sand isopach and lithofacies maps demonstrate that major palaeo-drainage area, were largely independent of structural highs. Location of meandering channel axes have been influenced by the switching of major channels into adjacent depocentres created predominantly from the differential compaction of silts, shales and coals.

Genetic unit mapping has allowed the determination of the geometries and trends of major sandstone bodies. The geometry of a sandstone body or package is largely controlled by the environment in which it was deposited. To establish sandstone trends necessitates a good understanding of environmental interpretations.

This type of mapping can establish whether or not a possible hydrocarbon trapping mechanism which is largely independent of structural closure exists. This type of trap style is more likely to be located in the lower deltaic plain and lacustrine depositional setting.

Australian School of Petroleum
THE UNIVERSITY OF ADELAIDE

SA 5005 AUSTRALIA

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