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Recent Exploration in PEPs 109 and 110, Onshore Gippsland Basin

Australia's major hydrocarbon production and reserves are located in the offshore portion of the Gippsland Basin, which extends from the south-eastern Victorian coastline to the north-eastern part of Bass Strait. Only a physiographic feature, the present day coastline separates the prolific offshore portion of the basin from the approximately 15,000 km2 onshore portion of the basin which lies to the south of the Victorian Ranges and east of the Mornington Peninsula. It is surprising then, that large parts of the onshore Gippsland Basin have been largely ignored since Arco Australia Limited and Woodside Petroleum Limited undertook restricted seismic and drilling operations in the 1960s and 1970s. This early exploration was aimed primarily at the early Cretaceous Strzelecki Group. The subsequent major dis coveries in the Latrobe Group clastics offshore failed to revive exploration onshore where the Latrobe Group section is present over a large area with comparable thickness and lithofacies. As with the now prolific Eromanga Basin in Queensland, poor understanding of the mechanisms of hydrocarbon generation, migration and displacement appear largely responsible for the sustained lack of exploration interest in the onshore Gippsland Basin. The recent spate of successes in the Eromanga Basin must place a new perspective on these mechanisms . Hartogen Energy Limited , Cluff Oil (Pacific) Limited, Plymouth Petroleum N .L. and Poseidon Oil Pty Limited were awarded PEPs I 09 and 110 in September 1984 (Fig. I). During the period December 1984 through to March 1985, the consortium undertook gravity and seismic surveys. Some 272 km of gravity readings were acquired over PEP I I 0 and 175 km over PEP I 09. Data were reduced and a Bouguer anomaly map produced. Modelling of gravity profiles and the generation of second order derivative maps enabled generalized geological cross sections to be generated in PEP 110. The Baragwanath Anticline is the prominent structural feature in PEPs 109 and I 10.