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Cretaceous To Tertiary Development Of The Barrow Sub-Basin: A Seismic Interpretation.

Young, Hamish C.

Honours Degree, 1995

University of Adelaide

Abstract

The focus of the project was the Cretaceous to Tertiary development of the northern Barrow Sub-basin, on the North West Shelf of Western Australia.

The interpretation of a 4050 km sub-regional grid of seismic data was conducted dominantly on 2D Workstations, utilising local well control and synthetic seismograms to map five key horizons. Time interval and time structure maps were generated.

Time interval maps were most useful in interpreting deposition, structural history and possible play types within the Cretaceous-Tertiary units. The findings were consistent with the structural, morphotectonic and stratigraphic models proposed for the Barrow Sub-basin. The time structure maps assisted in delineating potential hydrocarbon traps. Interpretation of the maps allowed the determination of the extent of the Barrow Group delta front, reworking of sediments into fan systems, subsidence, a possible orthogonal fault pattern, and monitoring of the growth of the Barrow Island Anticline. This enabled four potential structural and stratigraphic petroleum plays to be identified within the study region, including anticlinal structures, fault-bounded structures, distal submarine fans and traps adjacent to the relict Barrow Group delta face. The hydrocarbon plays were located at the Base Muderong Shale, directly above the prolific Barrow Group reservoir.

The play interpretations were based on the assumptions of suitable reservoir quality and thermal maturity. The study highlights considerable hydrocarbon potential in the Barrow Sub-basin and provides a focal point for future investigation.

Australian School of Petroleum
THE UNIVERSITY OF ADELAIDE

SA 5005 AUSTRALIA

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