Professional Opinion
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This summary of biostratigraphic data derived from Blackstone No. 1 well is based on the well completion report (Johnson 1968), and various other published and unpublished sources which update the original information. No samples have been re-examined. This well is important in that it formed the basis for the informal palynological zonation for the Permian presented by B.E. Balme in Kemp et al. (1977). The type section for the' Poulton Formation of Playford et al. (1975) is also in Blackstone #1.
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Legacy product - no abstract available
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Legacy product - no abstract available
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Legacy product - no abstract available
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In the course of a study to examine the depths to various regolith layers in the North Arunta area, anomalous geochemistry values where noticed in an area of particularly dense drilling. Company reports were obtained to further examine the area investigate if a prospect had been identified. A detailed magnetic survey (100 m line spacing) of the area was also revealed. With the aid of the company reports and data geology and mineralisation of the Abrolhos prospects have been investigated.
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Not available
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This summary of palaeontological data derived from Meda #1 well is based on information provided in the original well completion report and its subsequent publication (Pudovskis 1959, 1962), updated with reference to more recent palaeontological and biostratigraphic research in the Canning Basin and elsewhere. No samples have been re-examined, but in some cases this would seem to be a requirement to resolve uncertainties in dating certain horizons.
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This study was aimed at testing whether the regional tectonostratigraphic history established for Australia's premier hydrocarbon province, the North Carnarvon Basin, is applicable to the less well endowed, western Exmouth Sub-basin on its southern margin. This was achieved through the first systematic analysis of the structural architecture of the basin utilising 3D seismic and potential field data. Analysis focused on the Late Triassic to present basin history which highlighted some significant departures from the established tectonostratigraphic paradigm. The results indicate rifting occurred in two separate events. The first occurred under an east-west paleostress field and developed north striking faults controlled by Phanerozoic and Carbonifer to Permian pre-rift structures. This phase of basin development climaxed in the Callovian which resulted in the development of a significantly under filled basin and the deposition of anoxic petroleum source rocks. The first phase of rifting ceased in the Oxfordian and was followed by post-rift subsidence and later, previously unrecognised, Oxfordian to Tithonian south directed inversion localised above Proterozoic basement west-northwest oriented structures. This inversion event occurred under a detached stress filed which resulted in the formation of doubly plunging fault propagation anticline above south directed thrusts which terminated at a depth of 5-6 km. accompanied by contemporaneous extension along north to north-northeast striking fault segments in the upper most crust. Inversion ceased at the base of the Cretaceous and was followed by the second phase of rifting this time under west-northwest extension which resulted in rift fault system reorganisation and new normal fault growth. Rifting terminated at the onset of nearby Valanginian sea floor spreading. Post-rift thermal subsidence followed punctuated by variably directed periods of basin inversion over the last 130 Myrs. This long phase of inversion was enabled by an abnormally thick pre-rift lithosphere which took a long time to cool following rifting and hence could accommodated shortening over this long time span. A consideration of this thick lithosphere in hydrocarbon charge modelling in the Exmouth Sub-basin may lead to a change in the prevailing view that the main hydrocarbon charge occurred before the deposition of the regional seal, thereby making this apparently less well endowed basin more prospective for future exploration. A new understanding of the tectonstratigraphic evolution of the area has also highlighted new petroleum plays in previously un recognised structures some of which have been unaffected by Valanginian fresh water flushing and hence may contain non-biodegraded hydrocarbons.
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A GA Professional Opinion report developed for the Australian Department of Sustainability, Environment, Water, Population and Communities (DSEWPaC) to outline the existing State of Knowledge for 8 selected black and brown coal basins in Eastern Australia. This work is part of GA's contribution under the National Collaboration Framework Project Agreement on coal seam gas and large coal mines with DSEWPaC.
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Legacy product - no abstract available