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Commodity risk management contracts (Schedule of Group's Derivative Contracts) (Details) | 12 Months Ended
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Dec. 31, 2021 bbl $ / bbl
January 1, 2021 - March 31, 2021 |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, number of instruments held | bbl | 25,500
January 1, 2021 - March 31, 2021. |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 23,500
January 1, 2021 - March 31, 2021. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 38.91
January 1, 2021 - March 31, 2021. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 52.72
January 1, 2021. - March 31, 2021 |
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
January 1, 2021. - March 31, 2021 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 35.00
January 1, 2021. - March 31, 2021 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 43.01
April 1, 2021 - June 30, 2021 |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 25,500
April 1, 2021 - June 30, 2021 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 40.61
April 1, 2021 - June 30, 2021 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 53.59
July 1, 2021 - September 30, 2021 |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, number of instruments held | bbl | 20,000
July 1, 2021 - September 30, 2021. |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 18,000
July 1, 2021 - September 30, 2021. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 43.19
July 1, 2021 - September 30, 2021. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.64
July 1, 2021 - September 30, 2021.. |
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, 2021 - September 30, 2021.. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 41.50
July 1, 2021 - September 30, 2021.. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 68.57
October 1, 2021 - December 31, 2021 |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 19,500
October 1, 2021 - December 31, 2021 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 43.72
October 1, 2021 - December 31, 2021 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 62.65
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 | 10,000
July 1, 2022 - September 30, 2022. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 58.23
July 1, 2022 - September 30, 2022. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 84.37
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 | 1,500
July 1, 2022 - September 30, 2022.. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.00
July 1, 2022 - September 30, 2022.. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 90.50
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 | 1,500
July 1, 2022 - September 30, 2022 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.00
July 1, 2022 - September 30, 2022 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 96.70
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 | 6,000
October 1, 2022 - December 31, 2022 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.00
October 1, 2022 - December 31, 2022 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 86.38
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 | 1,500
October 1, 2022 - December 31, 2022. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.00
October 1, 2022 - December 31, 2022. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 91.40
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 | 1,500
October 1, 2022 - December 31, 2022.. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.00
October 1, 2022 - December 31, 2022.. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 99.30
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 | 1,500
October 1, 2022 .- December 31, 2022 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.00
October 1, 2022 .- December 31, 2022 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 101.70
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 | 1,500
October 1, 2022 - December. 31, 2022 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 65.00
October 1, 2022 - December. 31, 2022 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 102.50
January 1, 2023 - March 31, 2023 |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 1,500
January 1, 2023 - March 31, 2023 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.00
January 1, 2023 - March 31, 2023 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 103.70
January 1, 2023 - March 31, 2023. |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 1,500
January 1, 2023 - March 31, 2023. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 60.00
January 1, 2023 - March 31, 2023. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 104.75
January 1, 2023 - March 31, 2023.. |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 1,500
January 1, 2023 - March 31, 2023.. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 65.00
January 1, 2023 - March 31, 2023.. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 104.90
January 1, 2023 - March 31, 2023... |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 1,500
January 1, 2023 - March 31, 2023... | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 70.00
January 1, 2023 - March 31, 2023... | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 102.30
January 1, 2023 - March 31, 2023.... |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 1,500
January 1, 2023 - March 31, 2023.... | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 70.00
January 1, 2023 - March 31, 2023.... | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 109.50
April 1, 2023 - June 30, 2023 |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 1,500
April 1, 2023 - June 30, 2023 | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 65.00
April 1, 2023 - June 30, 2023 | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 100.75
April 1, 2023 - June 30, 2023. |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative contracts, Type of Instrument | Zero Premium Collars
Derivative contracts, number of instruments held | bbl | 1,500
April 1, 2023 - June 30, 2023. | Written put options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 70.00
April 1, 2023 - June 30, 2023. | Purchased call options [member] |
Disclosure Of Consolidated Statement Of Comprehensive Income [Line Items] |
Derivative Price | 103.50

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