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Frome Rocks No. 1 Well, which is situated on the northern edge of the Jurgurra Terrace, drilled to 734 feet through Recent sand and the normal sequence of Jurassic sediments of the South Canning Basin and then entered the top of the Frome Rocks Salt Dome. The Frome Rocks Salt Dome consists of l,522 feet of dolomite breccia cap rock and 1,747 feet plus of salt. The base of the salt was not reached. The age of the sediments composing the salt dome is not known, but slender evidence suggests that the age is Devonian to Lower Carboniferous. The intrusion of the salt dome probably took place in post-Permian and pre-Jurassic times. No signs of hydrocaroons were seen in the well and no formation tests were conducted. The Frome Rocks No. 2 Well drilled through 206 feet of Recent and Jurassic sandstones, and a standard Permiansequence (3,351 feet thick) to 3,557 feet. A thick sequence of uppermost Devonian (Middle to Upper Famennian) sedimentswas encountered between 3,557 feet and the total depth of 7,504 feet. This thick Devonian succession (3,947 plus feet) has been divided into two formations, one of siltstone and shale with some limestone and sandstone, from 3,557 feet to 6,264 feet, and the other of siltstone, from 6,264 feet to 7,504 plus feet. The primary objective, the Ordovician, was not reached. Persistent, though slight, hydrocarbon shows occurred in several zones throughout the upper two-thirds of the Devonian in the form of fluorescence associated With limestones, and a spotty oil staining in the uppermost sandstone bed. No hydrocarbons were detected by gas detection equipment. None of the hydrocarbon shows was of sufficient significance to warrant testing. In the Frome Rocks area, there is an association of a salt dome, a thick impermeable sequence, source rockpotential, and some reservoir potential. Should the same association occur in other areas along the Jurgurra Terrace, particularly if the reservoir potential improves, the petroleum prospects of the area must be upgraded.

This report refers to a seismic reflection survey conducted near the town of Muttaburra in Queensland, between 16th October and 12th December, 1959, by Geoseismic (Australia) Ltd, for the Artesian Basin Oil Company Pty Ltd. The purpose of the survey was to determine the nature of any structures present and the thickness of the sedimentary rocks. A number of isolated reconnaissance lines were laid and the shot-points were placed at one or two mile intervals. The records were computed by jump correlation. One structural feature found as a result of the reconnaissance traverses was investigated by more detailed work. A northerly plunging anticline, with easterly dip contrary to the regional westerly dip was delineated on two reflecting horizons. The relief due to the easterly dip is approximately 250 feet on the deeper horizon and 200 feet on the shallower horizon. To investigate the area fully, it would be necessary to carry out a further seismic reflection survey using the continuous profiling method of recording and computing.

Phillips Petroleum Company-Sunray Mid-Continent Oil Company Buckabie No. 1 Well was drilled from 1st May to 25th July, 1961 to a total depth of 9,070 feet. A normal Mesozoic section was penetrated from the Winton Formation on outcrop through the Walloon Formation, which at 5,216 feet lies unconformably on a series of continental clastic strata of undetermined age, here referred to as the 'Buckabie beds'. The well was completed as a dry hole after penetrating dense, steeply dipping, slightly metamorphosed mudstone at 8,810 to 9,070 feet. Twenty-three cores were cut and the well was logged with electric, radiation, and acoustic tools. No appreciable shows of oil or gas were obtained and five drillstem tests failed to recover formation fluids of any kind.

The Meda No. 1 Well was drilled with WAPET's National 100 rig to the total depth of 8,809 feet. The well was spudded in alluvium, which overlies the Blina Shale to 60 feet. Below the Blina Shale, the Permian sequence was penetrated, consisting of the Liveringa Formation, Noonkanbah Formation, Poole Sandstone with its Nura Nura Member, and Grant Formation. A disconformity is present between the Poole Sandstone and the Grant Formation. The Grant Formation unconformably overlies the Anderson Formation (Upper Carboniferous) at 4,201 feet. The Laurel Formation (Lower Carboniferous) was penetrated from 4,935 to 5,483 feet. The boundary between the Lower Carboniferous and Upper Devonian (5,483 feet) is tentatively picked at the change from interbedded limestone and siltstone to oolitic limestone. The main objective ofthe test, the Upper Devonian reef complex, was penetrated at 6,620 feet and drilled to the basal conglomerate at 8,360 feet. Precambrian basement was encountered at 8,663 feet. The Permian and Carboniferous sequences could be correlated with the equivalent sequences in The Sisters No. 1 Well. Because of different facies, no formation correlations could be made in the Devonian sequence. The test resulted in the recovery of several gallons of paraffin-base crude oil. The oil-bearing zone is in the upper part of the Laurel Formation and is confined to a bed of fine-grained slightly porous, calcareous and dolomitic sandstone between 5,125 and 5,133 feet. However because of slight permeability and high water saturation this zone is of no commercial value in this well. Numerous gas zones were penetrated in the Upper Devonian reef complex but they yielded only weak gas flows, predominantly of methane. The discovery of hydrocarbons in the Laurel Formation and Devonian reef complex makes Meda No. 1 of great importance in oil exploration of the Kimberley district. The drilling results show that future oil exploration on the Lennard Shelf should have two main objectives: (a) structural closures in the Lower Carboniferous (b) Devonian reef facies.

35% coverage east F55/B1-41 Contour interval: 10

Wolframite is the commonest source of tungsten, but scheelite is present in some mines. Minerals of bismuth, copper, molybdenum, lead, tin, and iron have been identified in association with the tungsten minerals. Minor amounts of gold are also present. The Hatches Creek Wolfram Field is situated near the north-eastern end of the Davenport Range in the Northern Territory. The Stuart Highway, a bitumenized road linking the port of Darwin with Tennant Creek and Alice Springs, crosses the Range at the north-western end. Wolfram deposits are present at Wauchope, The Devil's Marbles, Moscluito Creek, Kurunelli, Epenarra, Elkedra, and Hatches Creek; only the Wauchope and Hatches Creek deposits have proved to be economically important. The Wauchope deposits have been investigated by Sullivan (1952). The Hatches Creek Wolfram Field is defined for the purpose of this report as a roughly triangular area bounded by Hatches Creek, Mia Mia Creek, and the Hit or Miss Gully (Pl. 2). The area extends roughly seven miles in a northerly direction and is about three miles across at the base. Only two small tungsten bearing reefs and some reefs reputed to carry gold lie outside this area.

A seismic velocity survey was carried out in Associated Freney Oilfields Nerrima No. 1 Bore by the Bureau of Mineral Resources on the 10th August 1955. The well is situated on the Nerrima Dome in the Fitzroy Basin, W.A. Some trouble was experienced with cable breaks for the shallow part of the hole, but in general it was possible to recognise the true formation break. Average measured velocities ranged from 8000 ft/sec near the top to 12,200 ft/sec for the total depth of the bore.

Following a gravity survey of the Perth Basin in 1951-52 (Thyer and Everingham, 1956), in which it was indicated that a sedimentary thickness of about 35,000 ft was probably present in the Perth Basin, several seismic traverses were surveyed across the Basin. This Record deals with one such reflection traverse which was surveyed between Quindalup and Donnybrook. The purposes of the survey were to find the thickness and dip of the sediments and to discover any faulting or folding within them. Results of the survey were inconclusive regarding the depth to basement but indications are that it is at least 8000 ft in the deepest part of the B,sin along this traverse. The sediments appear to be folded and faulted. There is evidence for the existence of a major fault east of the Dunsborough Fault, and the existence of the Whicher Fault was tentatively confirmed.

Middalya in the Carnarvon Basin, Western Australia, during October 1955 by the Bureau of Mineral resources. The object of the survey was to assist in interpreting gravity results in the region. Prior to this survey the interpretation of the geology suggested that the deepest part of the Palaeozoic basin was in the Wandagee Hill area, but gravity results indicated that a basement ridge may exist in this same area. The seismic results indicate a sedimentary thickness of at least 17,000 ft between Wandagee Hill and Middalya and possibly 24,000 ft thickness to the east of Middalya. Although no useful information was obtained in the immediate vicinity of Wandagee Hill, extrapolation of results from farther east, suggests that the basement may be as shallow as 6000 ft just west of Wandagee Hill. This would confirm the interpretation of the gravity results at this location. The seismic cross-section shows that there may be a large elevation of the basement over a region about 20 miles west of Middalya between Shot-points 90 and 113. Although there is no direct evidence of this in the gravity results, it may be related to faulting, particularly a fault four miles east of Middalya that is indicated both by surface geology and by gravity results.