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  • These documents have been scanned by the GA Library. Please refer to the document for contents.

  • These documents have been scanned by the GA Library. Please refer to the document for contents.

  • These documents have been scanned by the GA Library. Please refer to the document for contents.

  • The completion report of A.A.O. No. 8, (Karumba) has been wrttten by A.C.M. Laing* and contributions on Petrology by N.C. Stevens,*** Micropalaeontology by I. Crespin,** and Electrical Logging by D.F. Dyson** are appended. The report is one of a series of reports published on bores subsidized under the Petroleum Search Subsidy Act, 1957-58. The hole was put down to determine the stratigraphical sequence of the south-eastern part of the Carpentaria Basin, an extension of the Great Artesian Basin, and to evaluate the significance of a gravity high. The significance of the bore is that the stratigraphical sequence of the area and the depth of hasement are now actually known from drilling evidence. It is the third test bore recently drilled in the Gulf of Carpentaria, on geophysical indications. The other two are Wyaaba No. 1 (Frome-Broken Hill Co. pty Ltd), and Weipa No. 1 (Zinc Corporation Ltd). The stratigraphy encountered in these bores is shown on the correlation chart, Plate 2. A composite well log of A.A.O. No. 8 is attached (Plate I). It is surprising to note from the log that no separate tests were made of the intervals 760-900 feet and 1540-1630 feet. The electrical log for both intervals suggests possibilities of oil, gas, or salt water; a small gas show was actually observed at 1595 feet. * Mines Administration Pty Ltd, Brisbane. ** Bureau of Mineral Resources, Canberra. *** University of Queensland.

  • The rig and ancillary gear were shipped by the 300-ton landing barge "Wewak" from Kaufana, Papua, to Wilson Island, a distance of approximately 1,000 miles. They were thence transferred to Wreck Island by the drilling company's landing barge "Tamona" of 47.38 registered tonnage. All stores, supplies, and fresh water were transported 58 miles from Gladstone by the "Tamona". Communications were maintained by an A.W.A. 5A Transceiver with OTC Station VIR Rockhampton. The bore was spudded in at 1400 hours, 7th May, 1959. 12-1/4 inch hole was drilled to 493 feet. Owing to lost circulation, no cuttings could be recovered from the hole, and a laborious system of bailing was resorted to. The 12-1/4 inch pilot hole was opened to 17-1/2 inches, and 13-3/8 inch J55x54.5 lb. STC casing was run to 480 feet. 12-1/4 inch hole was drilled to 1,170 feet, but owing to porous unconsolidated sediments and lost circulation in higher zones it was decided to run and cement 9-5/8 inch J55x40 lb. STC casing at 1,110 feet. 8-1/2 inch hole was then drilled to total depth, 1,898 feet. Recent, Pleistocene, Pliocene, and Miocene sediments were penetrated; basement was encountered at 1,795 feet. Fourteen cores were cut during the drilling of the bore, using a 20-foot Reed K500 "Kor-King" barrel. Both hard and soft formation 5-5/8 inch core heads were used. The hole was logged to total depth with a Failing Logmaster, giving the self-potential, 16 and 63 inch normal and single point resistivity, and gamma ray curves. No shows of oil or gas were noted, and in consequence no drill stem tests were carried out. Three deviation surveys were made; the maximum deviation was 1/2 degree at 1,580 feet. The bore was abandoned as a dry hole by placing cement plugs from 1,160 to 1,060 feet and from 50 feet to surface; a metal name plate affixed to a projecting pipe was welded on to the cap sealing the bore.

  • One hundred and thirty-nine species of foraminifera belonging to 56 genera are recorded. One new genus, Haerella, is described; 31 species are described as new, 76 have been previously described, 21 are recorded as partial identifications and eleven as doubtful identifications. The internal characters of several species have been investigated. An emended description has been given for the species Spiroplectinata compressiuscula (Chapman); the concept of the genus Praebulimina is discussed, and that of the genera Anomalinoides and Gavelinopsis. The type species of Anomalinoides, Anomalina pinguis Jennings, is found to have double septal walls. The use of the names Ellipsoidella and Nodosarella in the classification of uniserial calcareous foraminifera is also discussed. A chart shows the known vertical range of the recorded species in the areas investigated.

  • In March and April 1959, a seismic party from the Bureau of Mineral Resources extended a seismic survey carried out in 1958 in the Latrobe Valley. A seismic reflection traverse was run across the Latrobe Syncline between Tyers and Traralgon South to determine the structure of the coal measures, the depth of basement and, if possible, the type of basement. Results indicated that the Latrobe Syncline (the structural feature which coincides with the Latrobe River Valley) is a broad syncline in which the strata are more or less horizontally bedded. The maximum thickness of coal measures is about 2200 ft. The survey provided information on the structures of the limbs of the Latrobe syncline and on several minor structures superimposed on the main syncline. It did not, however, show for certain what type of basement rock underlies the coal measures. The survey provided information on the structure of the formations beneath the coal measures; and although some of the seismic data is of poor quality, there is probably an unconformity in the stratigraphic section between 5000 and 9000 ft. Reflections recorded at times as great as 2700 millisec, show that the sediments in the Latrobe Valley are probably between 10,500 and 15,000 ft. deep.

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  • Legacy product - no abstract available