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Subsidiary undertakings (Summary of Subsidiaries and Joint Operations) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Flamenco Block (Chile) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Flamenco Block (Chile) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Campanario Block (Chile) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Campanario Block (Chile) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Isla Norte Block (Chile) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Isla Norte Block (Chile) |  |
Proportion of ownership interest in joint operation | 60.00% |  |
Llanos 34 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Llanos 34 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 45.00% |  |
Llanos 32 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Llanos 32 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 12.50% |  |
Puelen Block (Argentina) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Puelen Block (Argentina) |  |
Proportion of ownership interest in joint operation | 18.00% |  |
Sierra del Nevado Block (Argentina) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Sierra del Nevado Block (Argentina) |  |
Proportion of ownership interest in joint operation | 18.00% |  |
CN-V Block (Argentina) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | CN-V Block (Argentina) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Los Parlamentos Block (Argentina) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Los Parlamentos (Argentina) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Manati Field (Brazil) |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Manati Field (Brazil) |  |
Proportion of ownership interest in joint operation | 10.00% |  |
POT-T-747 [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in joint operation |  |  | 70.00%
RECT128 [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in joint operation |  | 70.00% | 70.00%
POT-T-785 Block (Brazil) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | POT-T-785 Block (Brazil) |  |
Proportion of ownership interest in joint operation | 70.00% |  |
Morona Block, Peru [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Espejo Block (Ecuador) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Espejo Block (Ecuador) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Perico Block (Ecuador) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Perico Block (Ecuador) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Llanos 86 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Llanos 86 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Llanos 87 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Llanos 87 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Llanos 104 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Llanos 104 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Llanos 123 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Llanos 123 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Llanos 124 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Llanos 124 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
CPO-5 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | CPO-5 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 30.00% |  |
Mecaya Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Mecaya Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
PUT-8 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | PUT-8 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% | 50.00% |
PUT-9 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | PUT-9 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
PUT-12 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | PUT-12 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 60.00% | 60.00% |
Tacacho Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Tacacho Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
Terecay Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Terecay Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% | 50.00% |
Llanos 94 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | Llanos 94 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% | 50.00% |
PUT-36 Block (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of joint venture | PUT-36 Block (Colombia) |  |
Proportion of ownership interest in joint operation | 50.00% |  |
GeoPark Argentina Limited - Argentinean Branch (Argentina) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Argentina S.A.U (Argentina) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Brazil Explorao y Produo de Petrleo e Gs Ltda. (Brazil) [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Brasil Exploração y Produção de Petróleo e Gás Ltda. (Brazil) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Chile S.A. (Chile) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Chile S.p.A. (Chile) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Fell S.p.A. (Chile) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Fell S.p.A. (Chile) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Magallanes Limitada (Chile) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Magallanes Limitada (Chile) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark TdF S.A. (Chile) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark TdF S.p.A. (Chile) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Colombia S.A.S. (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Colombia S.A.S. (Colombia) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Latin America S.L.U. (Spain) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Latin America S.L.U. (Spain) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Colombia Coperatie U.A. (The Netherlands) [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Colombia S.L.U. (Spain) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Per S.A.C. (Peru) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Perú S.A.C. (Peru) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Colombia E&P S.A. (Panama) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Colombia E&P S.A. (Panama) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Colombia E&P Sucursal Colombia (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Colombia E&P Sucursal Colombia (Colombia) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Mexico S.A.P.I. de C.V. (Mexico) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Mexico S.A.P.I. de C.V. (Mexico) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark E&P S.A.P.I. de C.V. (Mexico) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark E&P S.A.P.I. de C.V. (Mexico) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark Per S.A.C. Sucursal Ecuador (Ecuador) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark Perú S.A.C. Sucursal Ecuador (Ecuador) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
GeoPark (UK) Limited (United Kingdom) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | GeoPark (UK) Limited (United Kingdom) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Amerisur Resources Limited (United Kingdom) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Amerisur Resources Limited (United Kingdom) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Amerisur Exploracin Colombia Limited (British Virgin Islands) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Amerisur Exploración Colombia Limited (British Virgin Islands) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Amerisur Exploracin Colombia Limited Sucursal Colombia (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Amerisur Exploración Colombia Limited Sucursal Colombia (Colombia) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Yarumal S.A.S. (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Yarumal S.A.S. (Colombia) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Petrodorado South America S.A. (Panama) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Petrodorado South America S.A. (Panama) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Petrodorado South America S.A. Sucursal Colombia (Colombia) {Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Petrodorado South America S.A. Sucursal Colombia (Colombia) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Fenix Oil & Gas Limited (British Virgin Islands) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Fenix Oil & Gas Limited (British Virgin Islands) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Fenix Oil & Gas Limited Sucursal Colombia (Colombia) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Fenix Oil & Gas Limited Sucursal Colombia (Colombia) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Amerisurexplor Ecuador S.A. (Ecuador) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Amerisurexplor Ecuador S.A. (Ecuador) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Amerisur S.A. (Paraguay) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Amerisur S.A. (Paraguay) |  |
Proportion of ownership interest in subsidiaries | 100.00% |  |
Market Access LLP (United States) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of subsidiaries | Market Access LLP (United States) |  |
Proportion of ownership interest in subsidiaries | 9.00% |  |

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