Brief description
A seismic aluvey was made between St George and the Queensland/South Australia border in the latter half of 1962. The results of the part of the survey over the Surat Basin, the Nebina Ridge, and the Eulo Shelf are presented in this Record. The survey aimed at providing information on the nature and structure,of the rocks underlying the Mesozoic sediments of the Great Artesian Basin, in particular across the Nebine Ridge and Eulo Shelf. The results of the survey between St George and Bollon indicated a sedimentary section of the order of 5000 ft overlying a basement rock of either metamorphic or igneous origin. The-deepest section recorded was of about 5700 ft, about 12 miles west of St George and probably corresponds to the Boolba Trough suggested by Jenkins (1958). The sedimentary section becomes gradually thinner westward as the Nebine Ridge is approached and about 3000 ft of sediments were recorded about ten miles west of Bollon. A reflection traverse northwards along the axis of the Boolba Trough indicated a thinning of sedimentary section of about 40 ft per mile. No structural explanation for a magnetic lineament interpreted from aeromagnetic work was found. Velocities of over 19,000 ft/s were recorded from granitic rocks at shallow depths over the Nebine Ridge. A velocity of 19,500 ft's was measured close to a granite outcrop at Eulo. A thickening of the sedimentary section between the Eulo Shelf and Nebine Ridge was confirmed by refraction shooting and depths indicated that the total section (3300 ft) was not significantly greater than the depth of the water bores. No apparent development of the trough to the north or west was indicated.Lineage
Maintenance and Update Frequency: asNeeded
Statement: During the latter half of 1962, the Bureau of Mineral Resources made a seismic reconnaissance survey between St George and the Queensland/South Australia border. It was intended that the survey should link together seismic surveys done in the Surat Basin by Union Oil Development Corporation, in the Thargomindah area by Phillips Petroleum Company and L.H. Smart Oil Exploration Company Ltd, and in the Innamincka area by the Delhi-Frome-Santos group of companies. The main purpose of the survey was to investigate the nature of the rocks beneath the Mesozoic sediments of the Great Artesian Basin attempting to determine whether they are sedimentary, ultra basic, or igneous, and also to determine whether there are any deep troughs of sediments beneath the Mesozoic rocks.
The survey began at St George and proceeded through Bollon, Cunnamulla, Eulo, and Thargominaah towards Nappamerry. Reconnaissance reflection work and refraction depth probes were planned in areas where there was a likelihood that deep sedimentary troughs may exist; refraction depth probes were planned only in areas of suspected shallow basement ridges to measure the depths and velocities of the basement rocks.
Issued: 1966
Data time period: 1962-07-27 to 1962-07-30
text: westlimit=144.75; southlimit=-28.25; eastlimit=148.75; northlimit=-27.25
Subjects
AU-QLD |
Earth Sciences |
Geophysics |
HVC_144637 |
Published_External |
Seismic Data seismic survey |
Seismology and Seismic Exploration |
geophysics |
geoscientificInformation |
petroleum exploration |
seismic reflection |
seismic refraction |
seismic velocity |
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Identifiers
- URI : pid.geoscience.gov.au/dataset/ga/76440
- global : dedbfd1f-11ed-72e2-e044-00144fdd4fa6
