PEDIRKA BASIN (INCLUDING THE ERINGA TROUGH) �� Previous acreage release — Eringa Trough exploration opportunity (Alexander and Jensen-Schmidt, 1995; PDF) Summary Age Permo-Carboniferous. Area in South Australia 27 000 km2 (10 420 sq. miles). Depth to target zones 600 – >2000 m. Thickness Up to 1500 m. Hydrocarbon shows Minor fluorescence, trace gas. First commercial discovery None. Identified reserves Nil. Undiscovered resources (50% prob.) Not determined. Production Nil. Basin type Intracratonic. Depositional setting Non-marine. Reservoirs Non-marine sandstone. Regional structure Faulted anticlines. Seals Non-marine shale, siltstone. Source rocks Non-marine shale, coal. Depth to oil/gas window 1250 m (oil). Number of wells 10. Seismic line km 5909 2D. Structural setting The Pedirka Basin has an area of 150 000 km2, approximately one fifth of which is in South Australia and the remainder in the Northern Territory, possibly extending from there into Queensland (Fig. 1). It is an intracratonic basin unconformably overlying the SE Amadeus Basin and western Warburton Basin which were deformed during the Alice Springs and possibly Delamerian Orogenies. A final NW–SE compressional phase of the Alice Springs Orogeny in the Mid to Late Carboniferous initiated deposition in the Pedirka Basin and created thrust faults such as occur at Mount Hammersley. Permo-Carboniferous sediments were subsequently deposited in a tectonically quiescent sag phase. In South Australia the Permian is entirely overlain by up to 2500 m of Triassic to Late Cretaceous sediments of the Simpson and Eromanga Basins. NNE-striking high-angle reverse faults separate NNW to NNE-trending anticlinal complexes (Fig. 2). The most prominent is the Dalhousie–McDills Ridge separating the Pedirka Basin into a western and eastern portion. Thin
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