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Commodity risk management contracts (Schedule of Group's Derivative Contracts) (Details) | 12 Months Ended
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Dec. 31, 2022 bbl $ / bbl
January 1, 2022 - March 31, 2022 |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 14,500
January 1, 2022 - March 31, 2022 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 49.10
January 1, 2022 - March 31, 2022 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 74.81
April 1, 2022 - June 30, 2022 |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 12,500
April 1, 2022 - June 30, 2022 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 53.35
April 1, 2022 - June 30, 2022 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 79.38
July 1, 2022 - September 30, 2022. |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 13,000
July 1, 2022 - September 30, 2022. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 58.63
July 1, 2022 - September 30, 2022. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 86.50
October 1, 2022 - December 31, 2022 |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 12,000
October 1, 2022 - December 31, 2022 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.63
October 1, 2022 - December 31, 2022 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 92.55
January 1, 2023 - March 31, 2023 | Cash flow hedges |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 9,500
January 1, 2023 - March 31, 2023 | Written put options [member] | Cash flow hedges |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 66.05
January 1, 2023 - March 31, 2023 | Purchased call options [member] | Cash flow hedges |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 112.59
April 1, 2023 - June 30, 2023 | Cash flow hedges |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 8,500
April 1, 2023 - June 30, 2023 | Written put options [member] | Cash flow hedges |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 69.12
April 1, 2023 - June 30, 2023 | Purchased call options [member] | Cash flow hedges |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 113.13
July 1, 2023 - September 30, 2023 | Cash flow hedges |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 2,000
July 1, 2023 - September 30, 2023 | Written put options [member] | Cash flow hedges |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 70.00
July 1, 2023 - September 30, 2023 | Purchased call options [member] | Cash flow hedges |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 101.13

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