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Geochemical evaluation of six wells from the Otway Basin, South Australia (attachment to 1982 annual report for EPP 18).
Created: 13 Nov 2024 Revised: 19 Dec 2024
Author: Cooper, B.S.;Barnard, P.C.;Smith, P.;Collins, A.G.

The well sections analysed are mainly of Cretaceous age and are largely in the early to middle mature zones for oil generation. The Lower Cretaceous sections in Geltwood Beach 1 and Chama 1a have attained sufficient maturity for the commencement...

The well sections analysed are mainly of Cretaceous age and are largely in the early to middle mature zones for oil generation. The Lower Cretaceous sections in Geltwood Beach 1 and Chama 1a have attained sufficient maturity for the commencement of gas generation. Minor oil source potential is identified for the Paaratte Formation in Lake Bonney 1 which would be realised with slightly greater burial off-structure. Traces of migrant oil are noted in the Upper Cretaceous formations in Caroline 1 and Mount Salt 1; larger amounts of non-indigenous hydrocarbons are noted in the Paaratte Formation in Argonaut-A 1, which may represent a biodegraded migrant oil or drilling contamination. Minor oil source potential is identified for the Otway Group in Chama 1a and Geltwood Beach 1, where the section is at an optimum level of maturity for oil generation. However, the main hydrocarbon product of the Otway Group is likely to be gas generated from coals. The sections analysed have just entered the main phase of gas generation and major gas generation may have already taken place where the Lower Cretaceous is buried more deeply off-structure.

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About this record

Record No mesac36149
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Energy Company Report - Annual licence or technical report
Contributor Robertson Research International Ltd
Sponsor
Tenement EPP 18
Tenement Holder Ultramar Australia Ltd;Shoreline Exploration Co.
Operator Ultramar Australia Ltd
Geological Province Otway Basin
Mine Name
Stratigraphy
Commodity
Notes 
Notes: Robertson Research report no. 4695P/D, prepared for American Ultramar Ltd, Mount Kisco, New York, USA. Includes: for each well, profiles of vitrinite reflectance values and spore colour indices plotted against depth, plus gas chromatograms...
Notes: Robertson Research report no. 4695P/D, prepared for American Ultramar Ltd, Mount Kisco, New York, USA. Includes: for each well, profiles of vitrinite reflectance values and spore colour indices plotted against depth, plus gas chromatograms of extracted alkanes derived either from macerals found in potential source rocks or from migrant oils trapped in tight reservoir rock sequences. See also Env 5876 for other Otway Basin source rock analysis data.
Geographic Locality: South-East;Mount Gambier;Millicent
Doc No: Env 05309 V2 p: 85-188
Drillhole: Lake Bonney 1;Geltwood Beach 1;Mount Salt 1;Caroline 1;Argonaut-A 1;Chama 1a
Drillhole Unit No: 6922 00001;6922 0300;7022 0200;7022 0000;6922 0009;6823 0085

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Language English
Metadata Standard ISO 19115-3

Citations

Use constraints License
License Creative Commons Attribution 4.0
Persistent identifier https://pid.sarig.sa.gov.au/document/mesac36149
Citation Cooper, B.S.;Barnard, P.C.;Smith, P.;Collins, A.G. Geochemical evaluation of six wells from the Otway Basin, South Australia (attachment to 1982 annual report for EPP 18). Energy Company Report - Annual licence or technical report
https://pid.sarig.sa.gov.au/document/mesac36149

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[139.668071,-38.415195],[140.966948,-38.415195],[140.966948,-37.498527],[139.668071,-37.498527],[139.668071,-38.415195]]]}
Purpose 

                    
                    

                    
                  		
                

              
                
                

                  
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