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Abstract

On the Adelie Coast continental margin, a multichannel seismic survey has revealed the presence of a thick sedimentary basin, beneath the outer continental shelf and upper slope, that may exceed 6000 m. This basin results from the creation and evolution of a continental margin, initiated about 100 million years ago from the separation of Australia and Antarctica. Beneath the outer shelf, which is 400-500 m deep, the sedimentary series consists of four units separated by three major unconformities:

-A prerift unit including a Precambrian basement, possible Paleozoic and early Mesozoic sediments and a Mesozoic synrift sequence;

-An early postrift unit, ranging in age from Cenomanian to Eocene, assumed to consist mainly of fluviatile to deltaic clastics;

-An Upper Eocene to Oligocene unit in a shallow marine environment;

-A Neogene glacial prograding unit.

The early postrift unit is considered to be a promising petroleum target based on comparison to other passive margins.

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