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Union-Kern-A.O.G. Middle Creek No. 1 was the fourth wildcat well drilled by Union Oil Development Corporation in the south-eastern part of the Surat Basin. The well, located approximately eight miles north-north-east of Union-Kern-A.O.G. Moonie No. 1, was drilled by Mines Administration Pty Limited for Union Oil Development Corporation to a total depth of 6126 feet. Drilling commenced on 19th May, 1962 and was completed on 8th June, 1962. A full programme of logging, testing, and coring was undertaken. The well penetrated 118 feet of Quaternary-Tertiary sandstone and shale; 2153 feet of Lower Cretaceous Roma Formation; 1053 feet of Lower Cretaceous-Jurassic Blythesdale Formation; 1045 feet of Jurassic Walloon Formation; 639 feet of Hutton Sandstone; 540 feet of Evergreen Shale; and 352 feet of Jurassic-Triassic Precipice Sandstone. Below the unconformity at the base of the Precipice Sandstone at 5912 feet, the test entered volcanic conglomerates and siliceous sandstones of the Permo-Carboniferous Kuttung Formation in which the well bottomed at 6126 feet. No drill stem test was carried out in tile Precipice Sandstone but high resistivity on the electric log suggests freshwater saturation. A 60-minute open hole formation test was made of a sandstone interval (5240-5263 feet) witilin the Evergreen Shale. A net rise of 4790 feet of slightly gassy water (37 gr;/gal.) was recovered on the test. In the absence of any significant shows, cement plugs were set and the well was abandoned on 10til June, 1962. The test drilling operation at Union-Kern-A.O.G. Middle Creek No. 1 was subsidized under tile Petroleum Search Subsidy Act 1959-1961, from surface to total depth.

This report refers to an offshore aeromagnetic survey over the continental shelf of south-eastern Australia, from Gippsland in the east, through Bass Strait, to Encounter Bay and Kangaroo Island in the west. The survey was carried out for Haematite Explorations Proprietary Limited by Aero Service Limited during the period 17th September to 21st December, 1961. A previous reconnaissance aeromagnetic survey carried out by the same contractor over Bass Strait in December, 1960, had indicated the existence of deep Tertiary-Mesozoic sedimentary basins. The objective of the later survey was to delineate these basins and to extend the investigation farther westward with a view to selecting areas for marine seismic surveys. 17,945 miles of aeromagnetic traverse were flown and the results of the operation are presented as contoured maps of total magnetic field intensity and of interpreted basement depth. As a result of the survey, several areas of deep sedimentation were delineated in sufficient detail to allow for the planning of subsequent investigation by marine seismic surveys.

Union-Kern-A.O.G. Flinton No. 1 Well was drilled by Union Oil Development Corporation in the south-western part of the Surat Basin, Queensland. The well, located approximately eight miles east-south-east of Flinton and 44 miles south-west of U.K.A. Cabawin No. I, was drilled by Oil Drilling and Exploration Limited for Union Oil Development Corporation to a total depth of 9123 feet. Drilling commenced on 10th August, 1963 and was completed on 11th September, 1963. A full programme of logging, testing, and coring was undertaken. The well penetrated 2685 feet of shales with minor sands of the Lower Cretaceous Roma Formation; 2384 feet of sandstone with interbedded siltstone, claystone, and shale of the Jurassic Blythesdale Formation; 668 feet of the Walloon Formation; 565 feet of the Hutton Sandstone; 888 feet of Evergreen Shale and Precipice Sandstone equivalents; 718 feet of the Triassic Wandoan Formation equivalent; 392 feet of the Triassic Cabawin Formation; 563 feet of the Permian Kianga Formation; 167 feet of the Permian Back Creek Formation; and 93 feet of Permo-Carboniferous Kuttung Formation in which the well bottomed at 9123 feet. Flinton No. 1 was drilled to test the hydrocarbon potential of a closed seismic structure. At the location of the well, the "G" Horizon structure map, which represents the structure on a stratigraphic level approximately at the top of the Precipice Sandstone, indicates a closure of about 100 feet over an area of about eleven square miles. No significant oil or gas shows were recorded. A drillstem test of the interval 7817 to 7845 feet was abortive because of packer failure. The well was then plugged below 4490 feet and leased for conversion to a water well. The stratigraphic drilling operation at Union-Kern-A.O.G. Flinton No. 1 was subsidized under the Petroleum Search Subsidy Act 1959-1961, from surface to total depth.

Flaxmans No. 1 Well was located within the south-eastern part of the Otway Basin, approximately 20 miles south-east of Warrnambool, on the Victorian coast. The well was drilled by Oil Drilling and Exploration Limited for Frome-Broken Hill Company Proprietary Limited, to a total depth of 11,528 feet. Drilling commenced on 3rd May, 1961 and was completed on 25th August, 1961. A full programme of logging, testing, and coring was undertaken. The well penetrated Miocene-Oligocene sediments to a depth of 2008 feet, Eocene-Upper Cretaceous to 4833 feet, Upper Cretaceous to 6490 feet, Middle Cretaceous to 6876 feet, Lower Cretaceous to 7330 feet, and Lower Cretaceous - (?) Jurassic otway Group sediments to total depth of 11,528 feet. Flaxmans No. 1 was drilled to test the hydrocarbon potential of the Tertiary and Mesozoic sediments in a closed seismic structure. Sixteen drillstem tests and ten production tests were undertaken but the maximum yield of 250 Mcf/D of gas from the interval 10,842 to 11,528 feet could not be maintained and the well was plugged and abandoned. Other possible reservoirs tested in the well yielded only small amounts of petroliferous gas, probably from solution in formation water. The stratigraphic drilling operation at Flaxmans No. 1 was subsidized under the Petroleum Search Subsidy Act 1959, from 4833 feet to total depth.

Wongela GeoIilysical Pty Ltd conducted a helicopter gravity survey for the French Petroleum Company (Australia) Pty Limited in northern South Australia during the period 22nd August to 21st November, 1963, and established 2204 new gravity stations. The area surveyed is in Oil Exploration Licences Nos 20 and 21, and originally covered 34,000 square miles. This area was increased to 35,500 square miles to fill in a gap between the subject survey and the Delhi Alton Downs survey farther east. The work is tied to previous reconnaissance gravity surveys in Central Australia and completes the gravity coverage of the Simpson Desert. The survey was carried out to determine the extent of Palaeozoic sedimentation in the area and in particular to determine whether Amadeus Basin sediments extend into the survey area. These sediments are masked in the area by relatively flat-lying Mesozoic and more recent sediments. The younger sediments have much the same thickness and density throughout the survey area, and for this reason their contribution to variations in the anomaly field is small. Hence the variations in the anomaly field are thought to be due mainly to density contrasts in the basement and between the basement and pre-Mesozoic sediments. The survey results have defined some major geological structural units. These are described and discussed individually in the text of the report. Of particular interest is the Dalhousie Gravity Depression which probably represents a large area of pre-Permian sedimentation, about 8000 feet in thickness. To the east of this feature is a platform area which was probably fairly stable and high standing dUring pre-Permian time in which period it received only a thin cover of sediments. It is probable that since early Permian times the area has been depressed relative to the area of the Dalhousie Gravity Depression and the area farther west, and has received extensive Permian and Mesozoic sedimentation, the sediments thickening towards the east.

Geltwood Beach No. 1 Well was located on the Geltwood Anticline, approximately 7 1/2 miles south-west of Millicent in the Otway Basin, in the south-eastern part of South Australia. The well was drilled by Drilling Contractors (Australia) pty Ltd for Beach Petroleum No Liability, to a total depth of 12,300 feet. Drilling commenced on 22nd August, 1963, and was completed on lOth November, 1963. A full programme of logging, testing, and coring was undertaken. After passing through 45 feet of Recent calcareous sand, the well penetrated 1860 feet of Miocene to Eocene marine and paralic sediments, and 1760 feet of (?) Palaeocene to Upper Cretaceous sands and grits. Below 3680 feet, a monotonous sequence of Upper to Lower Cretaceous sediments of the Merino Group were encountered and continued to total depth at 12,300 feet. Geltwood Beach No. 1 Well was drilled to test the hydrocarbon potential of Lower Tertiary and Upper Cretaceous sediments on a probable closed structure in an area where strandings of bitumen and heavy oil on the beaches were thought to indicate SUbmarine seepages. Evidence from wells at Mount Salt and Beachport indicated that Geltwood Beach No. 1 was near the edge of probable wedge-out of Middle to Upper Cretaceous and (?) Palaeocene marine sediments overlying Lower Cretaceous beds. Traces of gas were recorded at intervals from 4500 feet to total depth, but five drillstem tests yielded only slightly gascut salty water and drilling mud. The well was plugged and abandoned as a dry hole. The stratigraphic drilling operation at Geltwood Beach No. 1 was subsidized under the Petroleum Search Subsidy Act 1959-1961, from surface to total depth.

Planet Warrinilla North No. 1 Well was located approximately 32 miles south of Rolleston, and about 16-1/2 miles north of Planet Warrinilla No. 1 Well. The site was determined from an analysis of seismic data and was located on a culmination on the northern plunge of the Warrinilla Anticline in the Bowen Basin. Based on seismic control near the top of the Ingelara Formation, this structure is believed to have 120 feet of closure and an areal extent of six square miles. Drilling operations at Warrinilla North No. 1 were carried out between 28th July and 8th October 1963, after which production casing was set and further testing was undertaken between 10th-25th October. A full programme of logging, testing, and coring was carried out. The well passed through the Triassic Rewan Formation, and Permian beds which included the Bandanna Formation, Mantuan Productus Bed, Catherine Sandstone, Ingelara Formation, Aldebaran Sandstone, and Cattle Creek Formation. The well bottomed in the preCattle Creek fresh water beds at a depth of 6879 feet, and was abandoned on 25th October 1963. A number of gas shows were encountered in the well and although none of these proved commercial, much information was gathered both from the drilling of the well and from the evaluation testing that followed. A total of 23 drillstem tests was run. However, four of these were misruns. A maximum gas recovery of 162 000 cubic feet per day was obtained from the Aldebaran Sandstone. The well was drilled by Delta Drilling Company using a National 55 rig. Technical control at the well site was provided by N.A. Meyers of Cundill, Meyers and Associates, mud logging by Core Laboratories, Inc., and electrical logging by Schlumberger Seaco Inc. The test drilling operation at Planet Warrinilla NorthNo. 1 was subsidized under the Petroleum search Subsidy Act 1959-1961, from surface to total depth.

A gravity survey of 3883 stations covering an area of 4000 square miles was conducted in southern Queensland and northern South Australia by GeophySical service International's Party 662 for Delhi Australian Petroleum Ltd, from July to December. 1962. Most of the gravity stations were approximately one-half mile apart but 824 were one-quarter mile stations. In general, stations wel'e set in a four by fifteen-mile grid, although in some areas, particularly in the south-eastern portion of the survey. closer control was established. The survey was designed to determine the major gravity anomalies in the prospect area and to seek structural leads in an area almost devoid of outcrop. Fifteen gravity anomalies of significance were discovered eight of which are related to basement topography while the remainder indicate features within the sedimentary section. Computed sedimentary thicknesses ranging from 3500 feet to 21500 feet were obtained. Seven major anomalies related to basement features are recommended for further detailed geophysical investigation. In this summary, the results of the survey are presented on the Bouguer gravity map at a scale of 1:250 000. The geophysical operation undertaken in the Alton Downs area of the Great Artesian Basin. Queensland and South Australia, was subsidized under the Petroleum Search Subsidy Act 1959-1961.

A. F.O. lnderi No. 1 Well was located in the Bowen Basin, Queensland, approximately 15 1/2 miles north-west of Holleston. The well was drilled by Hichter Bawden Drilling Pty Ltd, under contract to Mines Administration Pty Limited, for Associated Freney Oil Fields N.L., to a total depth of 5433 feet. Drilling commenced on 29th June, 1963 and was completed on 11th .\ugust, 1963. A full programme of logging, testing, and coring was undertaken. The well was situated on or near the crest of the lnderi Anticline. Below a thin cover of Quaternary alluvium and Tertiary volcanic rocks the well penetrated Permian sediments from 92 feet to total depth. Economic basement was encountered at 5368 feet and the well was abandoned at 5433 feet in dominantly granite conglomerate. The Permian sediments included the Bandanna Formation, the Mantuan Productus Beds, "Dry Creek Shale", "Early Storms Sandstone", lngelara Formation, Aldebaran Sandstone, Cattle Creek Formation, and the Stanleigh Formation. The objective of the well was to test the hydrocarbon potential of the sediments in the lnderi Anticline, and to establish the section present in the area. Seismic evidence indicated a closure of 600 feet over an area of 15 square miles for the lnderi anticline itself, but closure is increased to 1000 feet over 45 square miles by upthrow against the Albinia Fault to the east. Eight open-hole formation tests were carried out. A gas flow of 800 Md/ D was recorded from the interval 1818 to 1901 feet (DST No. 4). Four of the tests yielded hydrocarbons. Three of these (DST' s Nos 1, 3, and 4) tested the same topmost sand of the Aldebaran Sandstone, and the fourth tested the inteval 3814 to 3944 feet (DST No. 7). Traces of cutting fluorescence were recorded from the Aldebaran Sandstone between 2140 and 2480 feet and live oil was found along a bedding plane in a fairly tight sandstone from Core No. 8 (2456 to 2466 feet). However, DST 1'0. 5, over the interval 23:32 to 2466 feet, produced fresh water only. No other flow was recorded and the well was plugged and abandoned. The stratigraphic drilling operation at A.FO. lnderi No. I was subsidized Under the Petroleum Search Subsidy Act 1959-1961, from surface to total depth.