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1976 marine seismic survey, R 10, operations, interpretation and final reports. Eucla and Bight Basins and Ceduna Terrace EPP 10 and EPP 11.
Created: 13 Nov 2024 Revised: 13 Nov 2024
Author: Whyte, R.K.

Three structural closures have been defined by the R 10 survey. These are Galah in Permit SA-11 and Kookaburra West and Kookaburra East in Permit SA-10. Economic evaluation of the structures is currently being undertaken, but it is considered in...

Three structural closures have been defined by the R 10 survey. These are Galah in Permit SA-11 and Kookaburra West and Kookaburra East in Permit SA-10. Economic evaluation of the structures is currently being undertaken, but it is considered in the meantime that the prospects will be downgraded by limited size, extreme waterdepths, probable poor quality reservoirs, and the likelihood of gas filling. An attempt was made to determine the nature of strong shallow reflectors and domes that occur in the southeast part of permit SA-10, by magnetic modelling. Geological evidence on seismic suggests that they are of volcanic origin, but it was established through the modelling exercise that the domes are not basaltic. The problem was not solved, though, because the domes may instead be pyroclastics or reefal developments. The latter seems unlikely, however, in the face of geological evidence. By examining the structural evolution of the Rosella-Jabiru trend, it has been hypothesised that a regional physiographic division of Cretaceous sedimentation into a platform province to the northeast and a deep basin province to the southwest, separated by a linear hinge zone, occurred along the outer margin of a slab of collapsed continental crust.

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About this record

Record No mesac34520
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Geophysical Report - Seismic Report - Operations
Contributor Southern Australia Team
Sponsor
Tenement
Tenement Holder Shell Development (Aust.) Pty Ltd
Operator Shell Development (Aust.) Pty Ltd
Geological Province
Mine Name Galah strong lead;Kookaburra West strong lead;Kookaburra East strong lead;Rosella - Jabiru trend;Rosella weak lead
Stratigraphy
Commodity
    Notes 
    Notes: Includes:  - 1976 marine seismic survey, R 10, reports. AIM:This was a detailed survey of EPPs 10 and 11 aimed at defining a prospect for drilling after May 1976, and was intended to resolve all possible uncertainties about the current...
    Notes: Includes:  - 1976 marine seismic survey, R 10, reports. AIM:This was a detailed survey of EPPs 10 and 11 aimed at defining a prospect for drilling after May 1976, and was intended to resolve all possible uncertainties about the current structural interpretation of these permit areas. It covered all three significant leads outlined by previous surveys, viz. Galah (EPP 11), Kookaburra (EPP 11/EPP 10) and Rosella (EPP 10). Within EPP 10 eight further lines were shot over the indistinct deep Jabiru feature, in conjunction with marine magnetometer profiling aimed at identifying discontinuous high-amplitude reflectors (possibly volcanics) in the upper part of the Cretaceous section, which so far have screened off deeper seismic data.METHODS:Survey dates: 2/3 - 10/3/76.Energy source: Tuned airgun array.CDP coverage: 2400%.Recording mode: 48 channel digital - Texas Instruments DFS IV recorder.SP interval: 50.0 metres, group interval: 50.0 metres.RESULTS:20 lines totalling 832.75 line km (700.7 km within EPP 10 and 132.05 km within EPP 11) were acquired by the Prakla-Seismos GMBH R.V. Prospekta, including 257.6 km of magnetics over the Jabiru feature along lines 880-883 and 885-889. Data was recorded down to nearly 8 seconds at a 4 msec sampling period, and processed in Singapore by Digicon. Positioning was achieved using XR Shoran supplied by Coastal Surveys Ltd. The survey interpretation concluded that the target leads are structurally sound prospects, but when risked economically they are bound to be judged undrillable in the prevailing exploration climate. They range in size from 55 to 75 square km in area, with maximum relief at top Platypus Formation reservoir objective level of between 125 and 240 metres. They also lie in water depths ranging from 1100 to 1330 metres, at distances of 255 to 265 km from the coast. The Rosella-Jabiru trend, formerly considered to represent an extremely large anticlinal fold trend, has instead now been found to constitute a complex faulted boundary between Cretaceous physiographic provinces, with no prospective closures apparent. Notes: Includes: - Coastal Surveys Ltd, 1976. Shoran final report, offshore South Australia project, for Prakla-Seismos GMBH, on behalf of Shell Development (Australia) Pty Ltd. fiche: 1, p: 3B-59; 10 fig. - Connard, P.D., March 1976. Operations report, R-10 marine seismic survey, South Australia offshore permits SA-10 and SA-11. fiche: 2; p: 60-102; 2 plans; 2 appx, 7 fig. - Appel, E. and Paul, F., Prakla-Seismos GMBH, 20 May 1976. South Australia, 1976, Great Australian Bight, on the execution of marine seismic reflection and magnetic surveys in the areas of the Petroleum Production Licences SA-10 and SA-11. fiche: 2; p: 103-114; 31 plans. - Whyte, R.K., January 1977. Interpretation report, R 10 marine seismic survey, South Australia deepwater permits SA-10 and SA-11 (indexed separately). fiche: 2-3; p: 115-137; 4 plans.Final stack seismic sections of all lines, and 1:100 000 scale shotpoint location maps (6 mapsheets), are stored separately to Env 2728 in the Petroleum Geophysics Branch large plan hanging stacks at Glenside Document Storage Centre.
Geographic Locality: Southern Ocean;Great Australian Bight;1976 R 10 Marine Seismic Survey
Doc No: Env 02728 p: 115-137

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    Language English
    Metadata Standard ISO 19115-3

    Citations

    Use constraints License
    License Creative Commons Attribution 4.0
    Persistent identifier https://pid.sarig.sa.gov.au/document/mesac34520
    Citation Whyte, R.K. 1976 marine seismic survey, R 10, operations, interpretation and final reports. Eucla and Bight Basins and Ceduna Terrace EPP 10 and EPP 11. Geophysical Report - Seismic Report - Operations
    https://pid.sarig.sa.gov.au/document/mesac34520

    Technical information

    Status
    Maintenance and Update Frequency
    Geographic Reference GDA2020 (EPSG:7844)
    Geo bounding box {"type":"Polygon","coordinates":[[[130,-35.5],[133,-35.5],[133,-33.5],[130,-33.5],[130,-35.5]]]}
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