A new 460 km long transect combines 6-12 fold explosive and 60 fold vibroseis data, proving that it is possible to re-use old, low fold seismic data by utilizing new processing techniques. We demonstrate comparability in resolution of reprocessed dynamite and new vibroseis data. Reprocessing of the dynamite data using a vertical stacking technique that simulates DMO corrections, followed by detailed velocity analysis, has resulted in an improved seismic section that images dipping structures not detected in the original processing.A new 460 km long transect combines 6-12 fold explosive and 60 fold vibroseis data, proving that it is possible to re-use old, low fold seismic data by utilizing new processing techniques. We demonstrate comparability in resolution of reprocessed dynamite and new vibroseis data. Reprocessing of the dynamite data using a vertical stacking technique that simulates DMO corrections, followed by detailed velocity analysis, has resulted in an improved seismic section that images dipping structures not detected in the original processing. Several deep penetrating shear zones in the Broken Hill block dip mostly to the SE, and link to a shallow thrust belt located further to the west. Because of the large depth of penetration, these shear zones may have conducted fluids from deeper levels, which has important implications for mineral exploration.

Chapter in Geoscience Australia Record for the Northern Yilgarn Seismic Workshop

Presented at the Evolution and metallogenesis of the North Australian Craton Conference, 20-22 June 2006, Alice Springs. Deep seismic reflection profiling has been used for many years to provide images of the continental crust in the third dimension (depth) across parts of Australia. Prior to the 2005 Tanami deep seismic survey, a limited amount of deep seismic reflection profiling was conducted in central and northern Australia. A major survey in 1985 examined the geometry of the Amadeus Basin and Arunta Block (Goleby et al., 1988). Subsequent surveys examined the Officer Basin and southern Musgrave Province in 1993 (Korsch et al., 1998) and the southern McArthur Basin in 2002 (Rawlings et al., 2004). Here, we review aspects of these surveys and briefly examine the implications for the tectonics of the region. <p>Related product:<a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=64764">Evolution and metallogenesis of the North Australian Craton Conference Abstracts</p>

A deep seismic reflection profile was acquired in South Australia and Victoria in November 2009 by Geoscience Australia with project partners AuScope, Geoscience Victoria, and Primary Industries and Resources South Australia (PIRSA). Along with previously acquired deep seismic reflection data, this 145 km long line completes a continuous east-west transect across the eastern Delamerian Fold Belt into the western Lachlan Fold Belt. The project aims included determining tectonic vergence during and after amalgamation of the Gondwana Supercontinent, understanding the transition from passive margin (Rodinia breakup) to convergent margin (Tasmanides orogenesis), and locating the so-called 'Tasman Line', the extent of Proterozoic continental crust.

The seismic stacking velocity data in the Great Australian Bight are a useful dataset for calculating depths and sediment thicknesses. This work compares these data with P-wave velocities from sonobuoys and sonic logs from wells, and on this basis a depth over-estimate of at least 15% can be expected from the depths derived from stacking velocities. Megasequence boundary depths are calculated for the Ceduna Terrace to further illustrate data quality. The database makes avaliable the unfiltered stacking velocities using conventional and horizon-consistent formats.

No abstract available

No abstract available

Legacy product - no abstract available

Seismic line 07GA-IG2, described here, forms part of the Isa-Georgetown-Charters Towers seismic survey that was acquired in 2007. The seismic line is oriented approximately east-west and extends from east of Croydon in the west to near Mt Surprise in the east (Figure 1). The acquisition costs for this line were provided jointly by the Geological Survey of Queensland and Geoscience Australia, and field logistics and processing were carried out by the Seismic Acquisition and Processing team from Geoscience Australia. Three discrete geological provinces have been interpreted on this seismic section (Figure 2). Two of these, the Numil and Abingdon Provinces, only occur in the subsurface. The upper crustal part of the seismic section consists of the Paleo- to Mesoproterozoic Etheridge Province, which here includes the Croydon Volcanic Group in the western part of the Province. In this east-west profile, the crust is essentially two-layered, with a strongly reflective lower crust defining the Numil and Abingdon Provinces and a less reflective upper crust being representative of the Etheridge Province.

This report is a description of velocity data acquired during the summer of 2006/07 on Geoscience Australia's seismic marine reflection, refraction and potential field survey GA302 over the Capel and Faust Basins, Lord Howe Rise. The survey was the final phase of the Australian Government's Big New Oil initiative commenced in 2003 to support acreage release in frontier basins. Previous data over the region are sparsely located, and the present survey will provide explorers with high quality data acquired and processed to modern standards. The Lord Howe Rise is thought to be a continental fragment detached from Australia during the formation of the Tasman Sea. The Capel and Faust Basins are of interest as possible frontier petroleum provinces, and the present work is aimed at improving the confidence of sediment thickness estimation, a critical parameter in evaluating of prospectivity. The study reviews the seismic reflection data from survey GA302, the sonobuoy refraction data acquired, and the stacking velocities from the seismic reflection processing.