This publication combines the completion reports of two wells drilled at Port Campbell in the Otway Basin, Victoria, by Frome-Broken Hill Company Proprietary Limited in 1959 and 1960. Port Campbell No. 1 was located near the crest of a seismic "high". The seismic reflection survey showed that there was an increase in thickness of section down dip to the south-east; Port Campbell No. 2 Well was sited about 1-3/4 miles south-east of Port Campbell No. 1. Port Campbell No. 1 Well was spudded in on 9th September, 1959, and reached a total depth of 5965 feet inparalic sediments of Lower Cretaceous age on 9th December, 1959. Miocene and Oligocene marl and calcareous clay were penetrated to 1375 feet, then more than 3000 feet of Lower Tertiary, Eocene and (?)Palaeocene,and 1000 feet of Cretaceous sediments. The only break evident in the succession in Port Campbell No. 1 was at 5656 feet where a lithological change was noted together with a conspicuous break on the electric log. At this depth the well intersected a porous horizon which produced a flow of petroliferous gas. Drilling commenced at Port Campbell No. 2 on 12th July, 196q and was completed on 1st December, 1960, at 8846 feet in sediments of the Otway Group. 1214 feet of Upper Tertiary (Miocene and Oligocene) and approximately 3800 feet of Lower Tertiary (Eocene and Palaeocene) sediments were intersected. Time boundaries are still indefinite but at least 2700 feet of Cretaceous sediments are thought to be present in the well. Two unconformities were deduced: the upper at 7910 feet, between the Waarre Formation and the Belfast Mudstone, corresponds to the break at 5656 feet in Port Campbell No. 1, but represents a hiatus smaller than that in the earlier well as an extra 770 feet (approximately) of basal Belfast Mudstone and topmost Waarre Formation are present in Port Campbell No. 2.* The lower unconformity separates the Waarre Formation and the Otway Group on a horizon lower. than was reached in Port Campbell No. 1, but it was not well defined by the information derived from the one hole. The petroliferous gas, and a small amount of condensate, produced in Port Campbell No. 1 was a strong but not commercial flow and came from a coarse quartz sandstone between 5656 and 5668 feet. On test, flow rate and pressure decreased rather rapidly and recovery, on standing, was practically imperceptible, indicating that the reservoir is small and not connected with any larger reservoir. Port Campbell No. 2 did not show any evidence of free gas or oil. The gas obtained from testing was only minor and derived from solution in formation water.

A detailed gravity survey was carried out in the Barlee area of the Canning Basin of Western Australia during the period 31st August, 1959 to 31st October, 1959, by West Australian Petroleum Pty Limited. The gravity observations were made by L.J. Starkey of Mines Administration Pty Limited and the gravity data were reduced and interpreted by Gravity Meter Exploration Company. A location for a proposed test well had been selected on a complex faulted anticline defined by previous seismic surveys. The objective of the gravity survey was to evaluate the possibility of a salt intrusion being associated with the structure. Analysis of the gravity data in conjunctionwith the results of previous geological and geophysical investigations shows no evidence of domed salt within the detailed survey area, although the presence of a regionally uniform thickness of bedded salt is not precluded. It is recommended that the test well be drilled deeper than 7000 feet in order to determine the nature of older, denser sediments which may bt: present in significant thickness.

Union-Kern-A.O.G. Cabawin East No. 1 was drilled by Union Oil Development Corporation, Kern County Land Company, and Australian Oil and Gas Corporation Limited in the Surat Basin, Queensland, 4.8 miles on a bearing 0800 from Cabawin No. 1 Well. The test was undertaken to investigate the possibility that the sub-commercial oil-bearing sand in Cabawin No. 1 might have a thicker development towards the east. The well was spudded in on 18th July, 1961, and penetrated a veneer of Tertiary; the Roma, Blythesdale, Walloon and Bundamba Formations of the Great Artesian Group; and the Cabawin, Kianga, and Back Creek Formations of the Bowen Group. Minor gas shows were encountered in coaly strata in the Blythesdale and Walloon Formations. Several small methane gas shows were indicated in sandstones of the Blythesdale, Walloon, and Bundamba Formations. Some very small gas showings were obtained through the Cabawin, Kianga and Back Creek Formations. Scattered oil fluorescence was noted from 6370 feet to total depth at 12,091 feet, but there were no important shows. The well indicated that the producing Kianga sand of Cabawin No. 1 was too silty in the Cabawin East location to be a reservoir. Cabawin East No. 1 was abandoned on 17th October, 1961.

A reconnaissance marine reflection seismic survey was conducted in 1961 by Seismograph Service Limited for West Australian Petroleum Pty Limited. The survey took place within the Carnarvon Basin in Western Australia, and covered Exmouth Gulf and the open coastal waters along the west coast of Western Australia from Frazer Island to Bernier Island (see Fig. 1). The project areas fall within Permit to Explore 28H. The survey was a two-boat operation. In the Exmouth Gulf area the survey was controlled by a Lorac radio navigational system, and along the west coast positioning was determined by sextant angle measurements to shore beacons and landmarks. All shots were recorded on magnetic tapes which were processed into variable-area record sections. The purpose of the survey was to obtain additional information on the regional geology and to map the extension of known structures in the North-West Cape region of the Carnarvon Basin. Information was also sought on the nature of the pre-Cretaceous to post-Palaeozoic faulting. The survey commenced on 15th July, 1961, and terminated on 20th August, 1961; a total of 753 miles of traverse was shot. The survey indicated that Exmouth Gulf is essentially synclinal in character in the Cretaceous and Tertiary sediments. Several major pre-Cretaceous fault trends which had already been mapped on land with the seismograph were followed beneath the Gulf. A pre-Cretaceous anticlinal axis underlies the Cape Range Anticline both to the north and to the south of the surface expression of the structure. An anticline was located trending north in the eastern part of the Gulf. A Cretaceous anticline near and parallel to the coast near Cardabia may be the extension of the Rough Range Anticline. To the south of Point Maud, the survey provided a much-needed tie between the Rough Range-Cape Range area and the structurally complex area round the Salt Marsh. Some structural features were found in this southern area and the trend of major faults was established. The geophysical operation undertaken in the Exmouth Gulf area, Western Australia, was subsidized under the Petroleum Search Subsidy Act 1959.

A reconnaissance seismograph survey of the Wandagee area of the Carnarvon Basin (see Figs 1, 2) was carried out by Geophysical Service International, Party 621, for West Australian Petroleum Pty Limited between November, 1961 and February, 1962. The project area falls within Permit to Explore 28H. The survey was designed to map the structure and the stratigraphy of the Wandagee Ridge (South) area of the Carnarvon Basin. The survey commenced on 9th November, 1961, and terminated on 7th February, 1962, after covering 115 1/2 miles of reflection traverse and 33 1/.3 miles of refraction traverse. The results of these reflection and refraction surveys were combined with other geophysical data to produce an overall interpretation. There are two distinct areas of interest separated by the Wandagee Fault. The Wandagee Fault is a large down-to-the-east normal fault in the pre-Cretaceous section, with reverse movement occurring later than the Cretaceous. Devonian rocks are present at shallow depth on the west side of the fault, but there are probably 10,000 feet of Permian on the east side. East of the Wandagee Fault the north-south trending Quail Anticline was partly delineated. It is suggested that this anticline closes in Permian and perhaps in Carboniferous Devonian horizons. The geoIhysical operation undertaken in the Wandagee Ridge area, Carnarvon Basin, Western Australia, was subsidized under the Petroleum Search Subsidy Act 1959.

Union-Kern-A.O.G. Wandoan No. 1 was the first wildcat drilled by Union Oil Development Corporation in the north-eastern part of the Surat Basin. Union-Kern-A.O.G. Moonie No. 1 had proven the potential of the Jurassic-Triassic Precipice Sandstone as an oil reservoir and it was necessary to evaluate this reservoir in other parts of the basin. In the Wandoan area seismic surveys defined a large north-plunging anticline in rocks of the Bowen Group (Triassic-Permian), with a domal closure in the Great Artesian Group superimposed on the north plunge of the feature. This domal closure shows more than 200 feet of vertical closure encompassing an area of 30 square miles. Wandoan No. 1 Well, located approximately 73 miles east-north-east of Roma, was drilled by Oil Drilling and Exploration Limited for Union Oil Development Corporation to a total depth of 10,736 feet. Drilling commenced on 22nd April, 1962 and was completed on 18th June, 1962. A full programme of logging, testing and coring was undertaken. The well penetrated 4798 feet of Mesozoic sediments of the Great Artesian Group, 4468 feet of tuffaceous shale, siltstone and sandstone of the Triassic Cabawin Formation of the Bowen Group and bottomed at 10,736 feet in the Lower Triassic-Upper Permian Kianga Formation. Wandoan No. 1 was drilled primarily to test the petroleum potential of the Precipice Sandstone. The test was continued for stratigraphic information through the Cabawin Formation into the Kianga Formation. A 60-minute open hole formation test was run over the interval 3260 to 3278 feet near the top of the main porous sandstone of the Precipice Sandstone. A net rise of 2830 feet of fresh water (10 gr./gal.) was recovered in the test. A subsequent analysis indicated traces of hydrocarbons in the formation water. Another 60-minute open hole formation test over the interval 6024 to 6095 feet in the upper part of the Cabawin Formation yielded a net rise of 105 feet of slightly gassy watery mud. The stratigraphic drilling operation at Union-Kern-A.O.G. Wandoan No. 1 was subsidized under the Petroleum Search Subsidy Act 1959-1961, from surface to total depth.

Jurien No. 1 Well was located on the western margin of the Perth Basin, Western Australia, approximately 76 miles south-south-east of Geraldton. The well was drilled by Oil Drilling and Exploration (W.A.) Fty Limited for West Australian Petroleum Fty Limited, to a total depth of 3366 feet. Drilling commenced on 9th July, 1962, and was completed on 21st August, 1962. A full programme of logging, testing, and coring was undertaken. The well was spudded in the Coastal Limestone of Pleistocene age, and penetrated 811 feet of Lower Triassic Kockatea Shale; 2274 feet of Permian (Artinskian) sediments; 35 feet of (1) Permian sandstone, and entered Precambrian granitic gneiss at 3208 feet. The well was drilled to investigate the stratigraphy and petroleum potential of the Permian sediments in the Jurien Anticline. At least 200 feet of structural closure over eight square miles were proved for that area on the basement refractor. The main objectives were the sandstones in the Irwin River Coal Measures and High Cliff Sandstone. No potential reservoir beds were observed and only the Lower Triassic Kockatea Shale appeared to be a good source rock for hydrocarbons although minor oil traces were observed in some of the Permian section. Three drillstem tests were carried out over the intervals 552 to 595 feet, 1940 to 2020 feet, and 2196 to 2356 feet. No water, oil, or gas was recovered in any of the tests. The stratigraIilic drilling operation at Jurien No. 1 was subsidized under the Petroleum Search Subsidy Act 1959-1961, from surface to total depth.

Eneabba No. 1 Well was located in the northern part of the Perth Basin, Western Australia, approximately 32 miles south-east of Dongara. The well was drilled by Oil Drilling and Exploration (W.A.) Pty Limited for West Australian Petroleum Pty Limited, to a total depth of 13,712 feet. Drilling commenced on 12th June, 1961 and was completed on 25th November, 1961. A full programme of logging and coring was undertaken. After drilling through 28 feet of Quaternary alluvium, the well penetrated 5558 feet of Lower Cretaceous to Middle Jurassic Yarragadee Formation, 276 feet of Middle Jurassic probable Cadda Formation equivalent, 3894 feet of Lower Jurassic to Upper Triassic Cockleshell Gully Formation, 960 feet of Upper Triassic Lesueur Sandstone, 436 feet of Middle to Lower Triassic Woodada Formation, and 2548 feet of Lower Triassic Kockatea Shale. The pipe stuck at 5275 feet when starting to pull out at 13,712 feet, and eventually the well was abandoned leaving 9200 feet of drill string in the hole. The well was drilled to investigate the petroleum potential and stratigraphy of the Mesozoic and Palaeozoic sediments in the northern part of the Perth Basin. The Mesozoic section was much thicker than expected at the well which had not reached the Palaeozoic when abandoned at 13,712 feet because of mechanical difficulties. Many oil shows and one strong gas show (from a fracture zone between 12,795 and 12,800 feet) were recorded in the Kockatea Shale but no formation tests were carried out because of the impervious nature of the formation. The stratigraphic drilling operation at Eneabba No. 1 was subsidized under the Petroleum Search Subsidy Act 1959, from surface to total depth.

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