<p>In preparation for a National Geoscience Mapping Accord project involving a seismic survey planned for 1993, seismic tests were conducted on the Nullarbor Plain south of Cook to investigate the feasibility of imaging the sedimentary sequences and basement beneath the platform carbonates of the Eucla Basin, and to anticipate scientific and logistic difficulties associated with seismic acquisition on the Nullarbor Plain.<p><b>Raw data for this survey are available on request from clientservices@ga.gov.au - Quote eCat# 74950</b>

<p>A consortium consisting of Geoscience Australia, Department of Primary Industries & Energy, Australian Government; the Department of Mineral Resources (DMR) (formerly the Department of Minerals and Energy), NSW State Government; CRA Exploration Pty. Ltd; Geopeko Pty. Ltd; Pasminco Pty. Ltd; conducted the Cobar Basin Seismic Survey during October to December 1989. The main objectives of the Cobar Basin seismic survey were to acquire deep reflection seismic data along several seismic lines across the Cobar Basin and the bounding west and east margins, and acquire high resolution seismic data across zones of known mineralisation in the Cobar Basin and bounding margins. The survey recorded 184 km of eight-fold Common-Middle-Point (CMP) deep reflection seismic data to 20 seconds two-way travel time, along three seismic lines.<p><b>Raw data for this survey are available on request from clientservices@ga.gov.au - Quote eCat# 74953</b>

<p>Geoscience Australia conducted the Bowen Basin Seismic Survey during July to October 1989. The major aim of the seismic survey was to record deep seismic reflection data across the northern part of the Bowen Basin, to test geological (extensional) models for the formation of the Bowen Basin. The deep seismic reflection survey by the BMR recorded 254 km of eight-fold Common-Depth-Point (CDP) seismic data, along three seismic lines.<p><b>Raw data for this survey are available on request from clientservices@ga.gov.au - Quote eCat# 74954</b>

<p>Geoscience Australia conducted equipment tests at Millmerran, Queensland, using the newly acquired Sercel SN368 data acquisition seismic system. The equipment operated satisfactorily and proved to be versatile.<p><b>Raw data for this survey are available on request from clientservices@ga.gov.au - Quote eCat# 74967</b>

A seismic investigation of the eastern margin of the Galilee Basin in Central Queensland was made by the Bureau of Mineral Resources in 1971. A seismic traverse was recorded between Lake Galilee No. 1 well and outcrops of the Drummond Group 80 km to the east. This area is covered by Cainozoic sediments and no seismic network has been attempted before the present survey. The area is of economic interest, as oil was recorded in a drill stem test in Lake Galilee No. 1 well in Carboniferous sediments in the interval 2890 to 2910 m and there are coal measures in the Upper Permian. Knowledge of the structure of the basin margin to the east of the well could reveal oil traps and economically mineable coal deposits. For the other two Galilee Basin surveys, please see L106 and L108.

The Oaklands-Coorabin Coalfield in the Riverina Division of New South Wales has been known for many years. Seismic refraction tests were carried out on a number of sections to assist in the interpretation of the gravity results during July and Sepetember, 1949.

Seismic reflection survey has been conducted to help identify the possible oil-bearing structures, which were revealed by two residual gravity anomalies in a geophysical survey made by the Bureau of Mineral Resources. Good reflections were obtained in some parts of the area, but the quality was not consistent. The seismic results appear to confirm a small closure near one of the gravity anomalies. No definite closure is shown near the other anomaly.

The Bureau of Mineral Resources made an experimental seismic survey in the Otway Basin, Victoria and SA, and in the Sydney Basin, NSW, from April to November 1965 and from mid February to mid March 1966. The survey used explosives as an energy source to obtain seismic reflection data for comparison with the results from an experimental 'Vibroseis' survey carried out for the Bureau by Seismograph Service Ltd during 1964.

A reconnaissance seismic reflection and refraction survey in the East Otway Basin, Victoria, was carried out by the Bereau of Mineral Resources from mid-February to mid-June 1967. The objective of the survey was to determine whether the gravity low areas of the Torquay Embayment and Port Phillip Sub-Basin in the eastern part of the Otway Basin contain thick Cretaceous sediments like those which has shown potential hydrocarbon source and reservoir characteristics in the western part of the Otway Basin. Nine reflection and five refraction traverses were recorded in the gravity low areas of the Barwon Trough and Port Phillip Sub-basin. Single-coverage reflection results of variable quality were obtained. Evidence for the presence of Tertiary section is provided by shallow reflections of good to fair quality, but the evidence for Cretaceous sediments is tenuous because of the poor quality of the deeper reflections, some of which may be multiples. The presence of several faults, onlappings and pinch-outs is also indicated. The refraction results are considered unreliable because of the difficulty of interpreting the discontinuous profiles and because of the mapped and suspected faults and pinch-outs in the sections.

A seismic reflection traverse was surveyed across the Perth Basin, Uestern Australia, between the townships of Rockingham and Mundijong. It was planned in order to give information regarding the depth of the Basin and its structure adjacent to the Darling Scarp. Seismic refraction traverses were surveyed to give the longitudinal velocities in the near surface granitic gneisses on the Precambrian Shield, and in the Cardup Series (Proterozoic) abutting the Darling Scarp. At least 14,000 ft of sediments are indicated in the deepest part of the Basin but there is no clear seismic evidence of what a maximum thickness might be. Seismic reflection results indicate that the sediments on the west of the Darling Scarp abut the older rocks on a plane that dips at about 60 degrees to the west and that cuts the surface some distance in front of the present position of the scarp. This suggests that the Darling Scarp at Eundijong is the surface expression of a normal fault. However, the presence of reflection alignments east of this postulated fault plane, and thus apparently arising within the granitic gneisses, is contrary to the fault hypothesis. The true nature of the tectonic features is thus unresolved. Seismic results indicate that faulting occurred within the Basin and such faulting may have completed closure of possible oil traps. Further seismic investigation of the faults and associated structures is recommended.