--> Abstract: Deep Structure of the Northern Carnarvon Basin, North West Shelf, by H. M. J. Stagg; #91015 (1992).

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ABSTRACT: Deep Structure of the Northern Carnarvon Basin, North West Shelf

STAGG, HOWARD M. J., Bureau of Mineral Resources, Canberra Australian Capital Territory, Australia

While the northern Carnarvon Basin underlying the southern North West Shelf is one of Australia's most hydrocarbon-rich provinces, relatively little is known of its deep structure and the control this deep structure has on hydrocarbon occurrences. In mid-1991, the Australian Bureau of Mineral Resources (BMR) acquired 1654 km of deep crustal seismic data (4800 m streamer, 192 channels; 48-fold coverage; 16 second record length) along 6 dip and 4 strike lines in the Dampier, Barrow, and Exmouth Sub-basins of the Carnarvon Basin, with the aims of determining the broad regional structural framework, deciphering the deep structure of the region, and assessing the control of deep structure on the development of the major hydrocarbon fields and plays, and particularly the effects resulting f om multiple reactivation of these structures. Processing of these data is scheduled for the first half of 1992. Prior to this survey, only two deep seismic lines had been recorded in the region. These relatively short lines were recorded to 15 seconds reflection time and clearly show detachments deep in the sedimentary section and strong mid- and lower-crustal reflections down to 10-11 seconds reflection time beneath the southeast flank of the Dampier Sub-basin.

The lines were also tied to 20 exploration wells, thereby providing modern regional ties of the principal seismic horizons throughout the region. Geohistory modeling of these wells is expected to provide valuable information on the vertical tectonic history at key points along each profile.

 

AAPG Search and Discovery Article #91015©1992 AAPG International Conference, Sydney, N.S.W., Australia, August 2-5, 1992 (2009)