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O.D.N.L. Penola No. 1 Well, located in the north-east corner of Section 500, Hundred of Penola, South Australia, was drilled by Oil Development N.L. under a "farm-out" agreement with General Exploration Company of Australia Limited to a total depth of 4985 feet. Drilling was commenced on 7th February, 1961, and the well was abondoned as a dry hole on 5th May, 1961. The drilling contractor was Australian Tube Wells Pty Ltd, and the rig used was a Failing 2500 - Holemaster. The operation provided for a programme of electric and mud logging, testing and coring. The Penola Well was designed to test the petroleum potentialities of the Coonawarra subsurface structure, which was first detected by a single reconnaissance seismic reflection traverse made through the Penola area. Beneath a thin Pleistocene cover Penola No. 1 penetrated a sequence of marine and paralic Tertiary, and marine and non-marine Mesozoic rocks, ranging in age from Oligocene to probable Upper Jurassic. The Tertiary sediments consisted of 215 feet of Gambier Limestone (Oligocene); 160 feet of Compton Conglomerate (Oligocene); followed by about 630 feet of paralic sands and grits of the Knight Group (middle to upper Eocene). There is a marked discontinuity at l040 feet where the well passed abruptly from the Eocene to Cretaceous arkosic sandstones and siltstones of the Merino Group. The Upper Member of the Runnymede Formation of Albian to (?) Cenomanian age was 2380 feet thick, and of marine origin in at least the lower 800 feet, between 2586 and 3420 feet. The lower nonmarine member of the Runnymede Formation (? Aptian) was represented between 3420 and 4300 feet. A slight angular unconformity is interpreted at about 4300 feet, below which the well is considered to have entered non-marine mudstones and sandstones of the Mocamboro Member of probable Upper Jurassic age. Minor showings of gas were encountered at Penola No. 1, none being of commerial significance. No signs of live oil were observed in the well.

The present work has been undertaken as part of a long-term project of describing the Permian pelecypod and gastropod faunas of Western Australia and western Northern Territory and of assessing their stratigraphical significance. Two portions have already appeared (Dickins, 1956; 1957). In the first paper pelecypods from earlier collections obtained from various parts of the sequence in the Carnarvon Basin were described; and in the second the earliest Permian (Sakmarian) pelecypod and gastropod fauna from the Lyons Group and the Carrandibby Formation. Other current work in palaeontology is being undertaken by B. E. Balme (pollen and microplankton), B. F. Glenister (ammonoids), G. M. Philip (crinoids and blastoids), June R. P. Ross (bryozoans), and G. A. Thomas (brachiopods). For faunal studies, the Permian rocks of the western part of Australia have the merit that the Lower Permian* has a complex of changing marine faunas which allow a detailed study of their phylogeny and range. The value of this sequence is enhanced by the presence of marine Upper Permian in the Fitzroy and Bonaparte Gulf Basins. It represents as complete a marine Permian sequence as any in Australia, if not the most complete, and is rivalled only by that of the Hunter Valley of New South Wales. The collections used have been mainly from the Geology Department of the University of Western Australia and from the Museum of the Geological Branch of the Bureau of Mineral Resources, Geology and Geophysics, Canberra. The Bureau of Mineral Resources collections include material from West Australian Petroleum Pty Limited.

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.

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

The Undilla Basin, in north-western Queensland, is a small sedimentary basin containing Cambrian limestones which adjoin the widespread but undated CamoowJal Dolomite to the West. In the latter part of 1961 the Bureau of Mineral Resources, Geology and Geophysics did a brief reconnaissance seismic survey lasting about seven weeks in the Undilla Basin. This Record describes briefly the work done and results obtained. The occurrence of limestone near the surface throughout the basin presented difficult problems in the application of the reflection and refraction seismic methods but some progress was made towards the solution of these problems.

This Record describes a seismic refraction survey made during 1961 in the Farm Area, Alice Springs, NT. Good refraction breaks were obtained only along the east-west Traverse K; the refraction breaks along the north-south traverses were very poor. Velocities indicated in the overburden are interpreted in terms of particular geological formations within the Mesozoic and Recent sediments. Results along additional east-west traverses would be needed before a similar interpretation could be applied to the bedrock velocities.

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