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  • The Jabini Field lies in Block AC/L1 and AC/L2 in the Timor Sea offshore Australia's northwest coast . It began production in August 1986 from Jabiru1Aat oil rates of about 13 500 Stb/day. To date, six producing wells have beencompleted in the field, and by 30th April 1991 the field had produced 60.26million Stb of oil. There are two productive reservoirs in the field. The highly productive Wsp9reservoir is of excellent quality and is characterised by a strong water driveleading to a high recovery factor. It contains over 90 per cent of the field reservesand five successful oil producing wells have been completed in this reservoir, flowing at initial oil rates of between 15 000 and 20 000 Stb/day. The subsidiary structurally higher Wsp8 reservoir is of lower quality and is limited in extent tothe northeast corner of the field in the region of Jabiru-7. This reservoir containsthe remainder of the reserves and Jabiru-7 only has only been completed in thisreservoir, flowing at initial oil rates of about 3000 Stb/day. . The number of producing wells is limited by the floating platform which has onlyfour production risers. As a consequence only the four highest producing wells, currently Jabiru -1, -6,-8ST1 -11ST are produced at any time which has led to abandonment of the Wsp8 producer, Jabiru 7ST1. This well may be reconnected but may not have sufficient potential to warrant such an action while more productive targets remain in the Wsp9 reservoir. Appraisal of the Jabiru Field has been problematic because of the difficulties of interpreting seismic in the area. The present structure mapping interpretationmay change based on results of further drilling. This makes any forecasts of untapped oil based on structural interpretation somewhat uncertain.

  • The National Geochemical Survey of Australia (NGSA) project has collected catchment outlet sediment samples from 1315 sites located in 1186 catchments (~10% of which were sampled in duplicate) covering over 80% of Australia, in a collaborative venture between Geoscience Australia and the geoscience agencies of all States and the Northern Territory. At each site, composited samples were collected from two depth intervals: (1) the Top Outlet Sediment from 0-10 cm depth, and (2) the Bottom Outlet Sediment from 60-80 cm depth on average. In the laboratory, the samples were dried, homogenised and separated into two grain-size fractions: (1) a 'coarse' fraction (0-2 mm), and (2) a 'fine' fraction (0-75 um). All together, thus, 5260 samples were prepared for analysis. Bulk splits were also separated for the determination of bulk properties. Samples were analysed for up to 68 chemical elements after Total, Aqua Regia and Mobile Metal Ion digestion methods. Several quality control measures were taken throughout the project and the data quality was assessed in a separate report. This report used the acquired geochemical data to investigate the preliminary implications of this new national dataset on exploration for energy and mineral resources in Australia. This was mostly done by overlaying the NGSA data on coverages of known deposits and occurrences for selected commodities: uranium (U), thorium (Th), gold (Au), copper (Cu), lead (Pb), zinc (Zn) and Rare Earth Elements (REEs). For U, an attempt was made to distinguish between calcrete-related and intrusion-related deposit types, and a local case study in the Pine Creek area is also presented. For Zn, preliminary results from an investigation into discrete field modelling using concentration-area (CA) fractal plots are also presented. Coincidence of known mineral deposits and occurrences with elevated geochemical element concentrations in the same catchment are highlighted. Several catchments have elevated geochemical element concentrations in catchments with no known mineral deposits or occurrences, which provide potential targets for exploration. This technique constitutes a useful and rapid tool for area selection where further, more detailed exploration effort could be expended to test these geochemical anomalies.

  • Legacy product - no abstract available

  • Legacy product - no abstract available

  • Legacy product - no abstract available