Abstract

Sahara No. 1 Well was proposed as a 10,000 - foot stratigraphic test to explore and to evaluate the hydrocarbon potential of Permian and pre-Permian sediments within the gentle structural depression of the Kidson Basin, south-western Canning Basin, Western Australia, at a location approximately 300 miles east-south-east of Port Hedland. The well, located about 178 miles south-east of Samphire Mirsh No. I, was drilled by Drilling Contractors (Aust.) pty Ltd for West Australian Petroleum pty Limited to total depth of 6956 feet. Drilling commenced on 11th January, 1965 and was suspended on 26th February, 1965. A full programme of coring and logging was undertaken; no drillstem testing was conducted, as none was warranted for evaluation. The well penetrated Recent sands from surface to 40 feet, undifferentiated Mesozoic sediments to 195 feet, which were followed by a normal Permian (Artinskian and Sakmarian) sequence, and entered the Devonian at 30':>5 feet. Drilling operations were suspended at 6956 feet in an undated evaporitic section encountered at 6670 feet. This interbedded evaporite-red bed unit exhibited swelling and sloughing properties in reaction with the drilling mud, and allowed only limited and hazardous penetration during the final three weeks of operation. These circumstances forced the suspension of Sahara No. 1 short of programmed depth, with an unknown thickness of sediments remaining unpenetrated. The Devonian and older sequence found in Sahara No. 1 had not been encountered elsewhere, and three new formations were established. Absence of microfossils prevents age assignment for the basal 3256 feet of red beds found below the upper limestone of probable Middle Devonian age. Sahara No. I, although suspended above its programmed depth because of insurmountable drilling conditions, has contributed significant stratigraphic information, provided a comprehensive evaluation 0:1: potential hydrocarbon reservoirs which were water-saturated at this location, and established a geological tie to substantial depth for the extensive geophysical surveys which have been conducted within the region. The stratigraphic drilling operation at Sahara No. 1 was subsidized under the Petroleum Search Subsidy Act 1959-1964, from surface to total depth.
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Product Type/Sub Type

nonGeographicDataset - GA Publication - Other Publication

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license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1966

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Other Publication
petroleum exploration
Earth Sciences

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English

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utf8

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unclassified

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Unknown

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pdf

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Organisation Name
Geoscience Australia
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ACT
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2601
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Australia
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Metadata File Identifier

a05f7892-d801-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2008-08-12

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unclassified

Metadata Contact

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pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
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2601
Country
Australia
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Downloads
For information on acquiring this product,
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Please note that support hours are 9 am to 5 pm weekdays