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Contents

   



(Top)
 


1 Description  



1.1  Hydrography  







2 Flora and fauna  



2.1  Fauna  







3 Geodynamic situation  



3.1  Tectonics  







4 Basin history  



4.1  Basement  







5 Stratigraphy  



5.1  Paleozoic  



5.1.1  Jurassic  









6 Petroleum geology  



6.1  Fields  







7 Mining  





8 Paleontology  





9 See also  





10 Sources  



10.1  Notes  





10.2  References  





10.3  Bibliography  



10.3.1  General  





10.3.2  Hydrodynamics  





10.3.3  Tectonics  





10.3.4  Petroleum  





10.3.5  Paleontology  





10.3.6  Reports  





10.3.7  Maps  









11 Further reading  














Llanos Basin







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Coordinates: 05°2400N 71°4000W / 5.40000°N 71.66667°W / 5.40000; -71.66667
 

From Wikipedia, the free encyclopedia
 


Llanos Basin
Cuenca Llanos
The Llanos Basin in Puerto López, Meta
Coordinates05°24′00N 71°40′00W / 5.40000°N 71.66667°W / 5.40000; -71.66667
EtymologyLlanos Orientales
Spanish: "eastern plains"
RegionOrinoquía
Country Colombia
State(s)Arauca, Boyacá, Casanare, Cundinamarca, Guainía, Guaviare, Meta, Norte de Santander
CitiesVillavicencio, Yopal
Characteristics
On/OffshoreOnshore
BoundariesColombia-Venezuela border (N), Guiana Shield (E), Vaupés Arch (S), Serranía de la Macarena (SW), Eastern Ranges (W)
Part ofAndean foreland basins
Area96,000 km2 (37,000 sq mi)
Hydrology
River(s)Orinoco watershed
Main rivers: Arauca, Meta, Guaviare, Vichada
Geology
Basin typeForelandonrift basin[note 1]
PlateSouth American[note 3]
OrogenyBreak-up of Pangea (Mesozoic)
Andean (Cenozoic)
AgePaleozoicorJurassic[note 2]
toHolocene
StratigraphyStratigraphy
FaultsEastern (W, bounding), Chichimene & Meta
Field(s)Rubiales, Caño Limón, many more

The Llanos Basin (Spanish: Cuenca Llanos) or Eastern Llanos Basin (Spanish: Cuenca de los Llanos Orientales) is a major sedimentary basin of 96,000 square kilometres (37,000 sq mi) in northeastern Colombia. The onshore forelandonMesozoic rift basin covers the departmentsofArauca, Casanare and Meta and parts of eastern Boyacá and Cundinamarca, western Guainía, northern Guaviare and southeasternmost Norte de Santander. The northern boundary is formed by the border with Venezuela, where the basin grades into the Barinas-Apure Basin.

Description

[edit]

The northeastern part of Colombia is characterized by its wavy plains, called Llanos Orientales, as part of the bigger Llanos that extend into Venezuela. The landscape is similar to a savanna and is poor in trees. It is located between the Eastern Ranges of the Colombian Andes in the west, the Vaupés Arch in the south and the Guiana Shield in the east.[1]

Geologically, the Llanos Basin underlies this typical landscape of the Llanos. An area where transport occurs mostly by small boats along the many rivers and the "buses of the Llanos", the Douglas DC-3 planes. The basin covers an area of 96,000 square kilometres (37,000 sq mi) and contains a stratigraphic column from the Paleozoic to recent.[2] Several of the formations in the basins are source rocks (Gachetá, Los Cuervos, Carbonera C8), reservoir rocks (Mirador, Barco, Guadalupe and the uneven numbered members of Carbonera). Seals are formed by the shaly intervals (even numbered) of the Carbonera Formation, Los Cuervos, and León.[3]

The basin is the main petroleum producing basin of Colombia, with four of the nations biggest oil fields located in the Llanos Basin. Major fields are Rubiales, Colombia's biggest and most recent giant discovery sealed by a complex of hydrodynamic processes, and Caño Limón, at the border with Venezuela.

Major concerns in the basin for the production of petroleum are biodegradation, hydrocarbon migration, fault seal capacity and water flow.

Hydrography

[edit]
Rivers of the Llanos Basin
Ariarí River

The Llanos Basin is crossed by numerous rivers, all belonging to the Orinoco watershed. From north to south:

  • Margua
  • Orinoco River
  • Meta River
  • Guaviare River
  • Vichada River
  • Flora and fauna

    [edit]

    Fauna

    [edit]
    Map of national parks in Orinoquía region

    Among other species, Lynch's swamp frog (Pseudopaludicola llanera) is endemic to the Llanos, with the species epithet referring to the plains.[4] Also the whip scorpion Mastigoproctus colombianus is reported from the Llanos Basin.[5]

    Geodynamic situation

    [edit]
    Plate tectonic situation of northwestern South America.
    Nazca Plate has been subdivided into Coiba and Malpelo Plates
    Coiba & Malpelo Plates

    The country of Colombia spreads out over six tectonic plates, clockwise from north:

    1. Caribbean Plate
    2. North Andes Plate
    3. South American Plate
    4. Malpelo Plate
    5. Coiba Plate
    6. Panama Plate

    The Llanos Basin is situated entirely on the South American Plate, bordering the North Andean Block or North Andean microplate in the west. The basin is one of three Colombian basins on the South American Plate, to the south the Caguán-Putumayo Basin and to the southeast the Vaupés-Amazonas Basin. The northern boundary of the Llanos Basin is formed by the Colombia-Venezuela border where the basin grades into the Barinas-Apure Basin on the Venezuelan side. The Catatumbo Basin, representing the Colombian portion of the larger Maracaibo Basin borders the Llanos Basin in the northwest and the western boundary is formed by the foothills (Piedemonte) of the Eastern Cordillera Basin, the sedimentary basin covering the Eastern Ranges of the Colombian Andes.

    Tectonics

    [edit]

    The basin is bound to the west by the Eastern Frontal Fault System, a 921.4 kilometres (572.5 mi) long fault system connecting the North Andes and South American Plates and thus the Eastern Cordillera Basin and the Llanos Basin. The fault system has an average strike of 042.1±19, but this orientation varies greatly along its course. The 1827, 1834, 1917, 1967, 1995, and 2008 earthquakes were all caused by fault movement as part of the system.[6]

    Basin history

    [edit]

    The tectonic history of the Llanos Basin, a foreland basin formed on top of Mesozoic rift basins, Paleozoic metasediments and Precambrian basement underlain by continental crust, goes back to the Early Jurassic.

    The Andean orogeny, represented by the tectonic uplift of the Colombian Eastern Ranges and its northern extension, the Serranía del Perijá, caused tilting and uplift in the Llanos Basin. During the Andean orogenic phase, the paleotemperatures in the basin dropped considerably; in the Baja Guajira area from 115 °C (239 °F) in the Early Miocene to 70 °C (158 °F) in the Late Miocene.[7] In the Late Miocene to Pliocene, the major faults to the southwest of the Cocinetas Basin, the Oca and Bucaramanga-Santa Marta Faults were tectonically active.[8]

    Basement

    [edit]
    The Cerros de MavecureinGuainía are a remnant of the Proterozoic basement underlying the Llanos Basin
    The Serranía de ChiribiqueteinGuaviare

    The stratigraphy of the Llanos Basin ranges, depending on the definition from either JurassicorPaleozoic to recent. The basement is formed by the westernmost extensions of the Guiana Shield. Remnants of these Precambrian formations are found as inselbergs in the far east of Colombia (Cerros de Mavecure), in the Serranía de la Macarena to the southwest of the basin and in the tepuis of the Serranía de Chiribiquete to the southeast.

    The Proterozoic crystalline rocks are overlain by metamorphosed sedimentary and igneous rocks ranging in age from CambriantoDevonian. Younger and contemporaneous Paleozoic deposits are only found in the subsurface and in regional correlative units as the Floresta and Cuche Formations of the Altiplano Cundiboyacense to the direct northwest and the Río Cachirí Group of the Cesar-Ranchería Basin farther northwest of the Llanos Basin.

    The units found in the Llanos Basin pertain to the Farallones Group and comprise the Valle del Guatiquía Red Beds, Pipiral Shale and the Gutiérrez Sandstone.[9]

    Stratigraphy

    [edit]
    Stratigraphy of the Llanos Basin and surrounding provinces
    Ma Age Paleomap Regional events Catatumbo Cordillera proximal Llanos distal Llanos Putumayo VSM Environments Maximum thickness Petroleum geology Notes
    0.01 Holocene
    Holocene volcanism
    Seismic activity
    alluvium Overburden
    1 Pleistocene
    Pleistocene volcanism
    Andean orogeny3
    Glaciations
    Guayabo Soatá
    Sabana
    Necesidad Guayabo Gigante

    Neiva

    Alluvialtofluvial (Guayabo) 550 m (1,800 ft)
    (Guayabo)
    [10][11][12][13]
    2.6 Pliocene
    Pliocene volcanism
    Andean orogeny3
    GABI
    Subachoque
    5.3 Messinian Andean orogeny3
    Foreland
    Marichuela Caimán Honda [12][14]
    13.5 Langhian Regional flooding León hiatus Caja León Lacustrine (León) 400 m (1,300 ft)
    (León)
    Seal [13][15]
    16.2 Burdigalian Miocene inundations
    Andean orogeny2
    C1 Carbonera C1 Ospina Proximal fluvio-deltaic (C1) 850 m (2,790 ft)
    (Carbonera)
    Reservoir [14][13]
    17.3 C2 Carbonera C2 Distal lacustrine-deltaic (C2) Seal
    19 C3 Carbonera C3 Proximal fluvio-deltaic (C3) Reservoir
    21 Early Miocene Pebas wetlands C4 Carbonera C4 Barzalosa Distal fluvio-deltaic (C4) Seal
    23 Late Oligocene
    Andean orogeny1
    Foredeep
    C5 Carbonera C5 Orito Proximal fluvio-deltaic (C5) Reservoir [11][14]
    25 C6 Carbonera C6 Distal fluvio-lacustrine (C6) Seal
    28 Early Oligocene C7 C7 Pepino Gualanday Proximal deltaic-marine (C7) Reservoir [11][14][16]
    32 Oligo-Eocene C8 Usme C8 onlap Marine-deltaic (C8) Seal
    Source
    [16]
    35 Late Eocene
    Mirador Mirador Coastal (Mirador) 240 m (790 ft)
    (Mirador)
    Reservoir [13][17]
    40 Middle Eocene Regadera hiatus
    45
    50 Early Eocene
    Socha Los Cuervos Deltaic (Los Cuervos) 260 m (850 ft)
    (Los Cuervos)
    Seal
    Source
    [13][17]
    55 Late Paleocene PETM
    2000 ppm CO2
    Los Cuervos Bogotá Gualanday
    60 Early Paleocene SALMA Barco Guaduas Barco Rumiyaco Fluvial (Barco) 225 m (738 ft)
    (Barco)
    Reservoir [10][11][14][13][18]
    65 Maastrichtian
    KT extinction Catatumbo Guadalupe Monserrate Deltaic-fluvial (Guadalupe) 750 m (2,460 ft)
    (Guadalupe)
    Reservoir [10][13]
    72 Campanian End of rifting Colón-Mito Juan [13][19]
    83 Santonian Villeta/Güagüaquí
    86 Coniacian
    89 Turonian Cenomanian-Turonian anoxic event La Luna Chipaque Gachetá hiatus Restricted marine (all) 500 m (1,600 ft)
    (Gachetá)
    Source [10][13][20]
    93 Cenomanian
    Rift 2
    100 Albian Une Une Caballos Deltaic (Une) 500 m (1,600 ft)
    (Une)
    Reservoir [14][20]
    113 Aptian
    Capacho Fómeque Motema Yaví Open marine (Fómeque) 800 m (2,600 ft)
    (Fómeque)
    Source (Fóm) [11][13][21]
    125 Barremian High biodiversity Aguardiente Paja Shallow to open marine (Paja) 940 m (3,080 ft)
    (Paja)
    Reservoir [10]
    129 Hauterivian
    Rift 1 Tibú-
    Mercedes
    Las Juntas hiatus Deltaic (Las Juntas) 910 m (2,990 ft)
    (Las Juntas)
    Reservoir (LJun) [10]
    133 Valanginian Río Negro Cáqueza
    Macanal
    Rosablanca
    Restricted marine (Macanal) 2,935 m (9,629 ft)
    (Macanal)
    Source (Mac) [11][22]
    140 Berriasian Girón
    145 Tithonian Break-up of Pangea Jordán Arcabuco Buenavista

    Batá

    Saldaña Alluvial, fluvial (Buenavista) 110 m (360 ft)
    (Buenavista)
    "Jurassic" [14][23]
    150 Early-Mid Jurassic
    Passive margin 2 La Quinta

    Montebel


    Noreán
    hiatus Coastal tuff (La Quinta) 100 m (330 ft)
    (La Quinta)
    [24]
    201 Late Triassic
    Mucuchachi Payandé [14]
    235 Early Triassic
    Pangea hiatus "Paleozoic"
    250 Permian
    300 Late Carboniferous
    Famatinian orogeny Cerro Neiva
    ()
    [25]
    340 Early Carboniferous Fossil fish
    Romer's gap
    Cuche
    (355-385)
    Farallones
    ()
    Deltaic, estuarine (Cuche) 900 m (3,000 ft)
    (Cuche)
    360 Late Devonian
    Passive margin 1 Río Cachirí
    (360-419)
    Ambicá
    ()
    Alluvial-fluvial-reef (Farallones) 2,400 m (7,900 ft)
    (Farallones)
    [22][26][27][28][29]
    390 Early Devonian
    High biodiversity Floresta
    (387-400)

    El Tíbet

    Shallow marine (Floresta) 600 m (2,000 ft)
    (Floresta)
    410 Late Silurian Silurian mystery
    425 Early Silurian hiatus
    440 Late Ordovician
    Rich fauna in Bolivia San Pedro
    (450-490)
    Duda
    ()
    470 Early Ordovician First fossils Busbanzá
    (>470±22)

    Chuscales

    Otengá

    Guape
    ()
    Río Nevado
    ()

    Hígado
    ()

    Agua Blanca
    Venado
    (470-475)

    [30][31][32]
    488 Late Cambrian
    Regional intrusions Chicamocha
    (490-515)
    Quetame
    ()
    Ariarí
    ()
    SJ del Guaviare
    (490-590)
    San Isidro
    ()
    [33][34]
    515 Early Cambrian Cambrian explosion [32][35]
    542 Ediacaran
    Break-up of Rodinia pre-Quetame post-Parguaza El Barro
    ()
    Yellow: allochthonous basement
    (Chibcha Terrane)
    Green: autochthonous basement
    (Río Negro-Juruena Province)
    Basement [36][37]
    600 Neoproterozoic Cariri Velhos orogeny Bucaramanga
    (600-1400)
    pre-Guaviare [33]
    800
    Snowball Earth [38]
    1000 Mesoproterozoic
    Sunsás orogeny Ariarí
    (1000)
    La Urraca
    (1030-1100)
    [39][40][41][42]
    1300 Rondônia-Juruá orogeny pre-Ariarí Parguaza
    (1300-1400)
    Garzón
    (1180-1550)
    [43]
    1400
    pre-Bucaramanga [44]
    1600 Paleoproterozoic Maimachi
    (1500-1700)
    pre-Garzón [45]
    1800
    Tapajós orogeny Mitú
    (1800)
    [43][45]
    1950 Transamazonic orogeny pre-Mitú [43]
    2200 Columbia
    2530 Archean
    Carajas-Imataca orogeny [43]
    3100 Kenorland
    Sources
    Legend


    Paleozoic

    [edit]
    Cambro-Ordovician
    Pre-Devonian
    Devonian

    Jurassic

    [edit]

    Petroleum geology

    [edit]

    The Llanos Basin is the most prolific hydrocarbon basin of Colombia, hosting well-known petroleum deposits as Caño Limón, Rubiales and other fields. Nine of the twenty most producing oil fields of Colombia are situated in the Llanos Basin.

    Fields

    [edit]

    Based on data released in March 2018, Colombia is the 21st oil producer in the world. Daily production dropped in 2017 to 854.121 thousand barrels per day (135.7944×10^3 m3/d).[50] In 2016, twenty oilfields produced 66% of all oil of Colombia, listed below in bold.[51] The total proven reserves of Colombia were 1,665.489 million barrels (264.7916×10^6 m3) in 2016.[52]

    Major oil fields in the Llanos Basin are:[53]

    Major oil and gas fields of the Llanos Basin
    Name Map Location Operator Reservoirs Reserves
    Production (2016)
    Notes
    Rubiales
    Puerto Gaitán
    Meta
    Ecopetrol Carbonera 7 4,380 million bbl (696 million m3)
    132.000 kbbl/d (20.9863×10^3 m3/d)
    Castilla
    Castilla la Nueva
    Meta
    Ecopetrol Mirador
    Gachetá
    Une
    452 million bbl (71.9 million m3)
    121.363 kbbl/d (19.2952×10^3 m3/d)
    [54][55]
    Chichimene
    Acacias
    Meta
    Ecopetrol Mirador
    Guadalupe
    Gachetá
    Une
    74.052 kbbl/d (11.7733×10^3 m3/d) [56][57]
    Quifa
    Puerto Gaitán
    Meta
    Meta Petroleum Carbonera 613 million bbl (97.5 million m3)
    46.557 kbbl/d (7.4020×10^3 m3/d)
    [58][59]
    Caño Limón
    Puerto Rondón
    Arauca
    Ecopetrol 20.930 kbbl/d (3.3276×10^3 m3/d) [60]
    Avispa
    Cabuyaro
    Meta
    Pacific Rubiales 11.625 kbbl/d (1.8482×10^3 m3/d)
    Ocelote
    Puerto Gaitán
    Meta
    Hocol 11.228 kbbl/d (1.7851×10^3 m3/d)
    Chipirón
    Puerto Rondón
    Arauca
    OXY 10.459 kbbl/d (1.6628×10^3 m3/d) [59]
    Jacana
    Villanueva
    Casanare
    Geopark 7.477 kbbl/d (1.1887×10^3 m3/d)
    Cupiagua
    Aguazul
    Casanare
    Ecopetrol 5.358 kbbl/d (851.9 m3/d)
    Apiay
    Villavicencio
    Meta
    Ecopetrol Gachetá
    Une
    Arauca
    Arauca
    Arauca
    Ecopetrol
    Cusiana
    Tauramena
    Casanare
    Ecopetrol Mirador
    Barco
    Guadalupe

    Mining

    [edit]

    Mining activities in the Llanos Basin are restricted to certain areas, resulting in less conflicts, more common with indigenous peoples in the Amazonian part of Colombia.[61]

    InSan José del Guaviare platinum is mined.[65]

    Mining in the Llanos Basin and surrounding areas
    Resources Map Department Municipality Mine Notes
    halite
    Meta Restrepo Upín [63][66]
    gold
    Puerto Rico [62]
    Arauca Arauca
    gold
    Guaviare San José del Guaviare
    platinum, iron, albite, andradite (var: melanite), 'apatite', arfvedsonite, 'biotite', calcite, cancrinite, epidote, fluorite, 'garnet', microcline, 'monazite', nepheline, siderite, titanite, zircon [65][67]
    coal
    Casanare Recetor [64]

    Paleontology

    [edit]
    Llanos Basin is located in Colombia
    B

    B

    C

    C

    F

    F

    L

    L

    J

    J

    M

    M

    P

    P

    H

    H

    Co

    Co

    Major fossiliferous formations
    Neogene
     H = Honda Group
     Co = Cocinetas Basin
    Paleogene
     B = Bogotá
     C = Cerrejón
    Cretaceous
     L = La Frontera
     P = Paja
    Jurassic
     J = Valle Alto
    Devonian
     F = Cuche and Floresta
    Cambro-Ordovician
     M = Duda, La Macarena

    Compared to many fossiliferous formations in Colombia, the Llanos Basin has been lean in fossil content. Most of the basin stratigraphy is only known from wells.

    Paleozoic outcrops surrounding and perforating the planar geography have provided fossils dating back to the Cambrian; the Duda and Ariarí Formations.

    Several fossiliferous formations of contemporaneous depositional environments have provided many unique fossils indicative of paleoclimatic conditions; turtle fossils were described from Los Cuervos in the Cesar-Ranchería Basin, and the Mirador Formation in the Catatumbo Basin direct northwest of the Llanos Basin has provided many fossil flora.[68]

    Other correlative units with surrounding basins

    See also

    [edit]

    Sources

    [edit]

    Notes

    [edit]
    1. ^ More detailed: continental margin (Protero- and Paleozoic), rift basin (Mesozoic), foredeep (Paleogene and early Neogene), foreland (late Neogene to recent)
  • ^ Depending on the definition of basement, the stratigraphic succession starts either in the Paleozoic on Proterozoic crystalline basement or Jurassic on top of both
  • ^ The northernmost of three Colombian basins on this plate, to the south the Caguán-Putumayo and Vaupés-Amazonas Basins
  • ^ based on Duarte et al. (2019)[46], García González et al. (2009),[47] and geological report of Villavicencio[48]
  • ^ based on Duarte et al. (2019)[46] and the hydrocarbon potential evaluation performed by the UIS and ANH in 2009[49]
  • References

    [edit]
    1. ^ Barrero et al., 2007, p.69
  • ^ ANH, 2010
  • ^ García González et al., 2009, p.58
  • ^ Pseudopaludicola llaneraatIUCN.org
  • ^ Mastigoproctus colombianusatGBIF.org
  • ^ Paris et al., 2000a, p.36
  • ^ Hernández Pardo et al., 2009, p.122
  • ^ Hernández Pardo et al., 2009, p.28
  • ^ Plancha 266, 1998
  • ^ a b c d e f García González et al., 2009, p.27
  • ^ a b c d e f García González et al., 2009, p.50
  • ^ a b García González et al., 2009, p.85
  • ^ a b c d e f g h i j Barrero et al., 2007, p.60
  • ^ a b c d e f g h Barrero et al., 2007, p.58
  • ^ Plancha 111, 2001, p.29
  • ^ a b Plancha 177, 2015, p.39
  • ^ a b Plancha 111, 2001, p.26
  • ^ Plancha 111, 2001, p.24
  • ^ Plancha 111, 2001, p.23
  • ^ a b Pulido & Gómez, 2001, p.32
  • ^ Pulido & Gómez, 2001, p.30
  • ^ a b Pulido & Gómez, 2001, pp.21-26
  • ^ Pulido & Gómez, 2001, p.28
  • ^ Correa Martínez et al., 2019, p.49
  • ^ Plancha 303, 2002, p.27
  • ^ Terraza et al., 2008, p.22
  • ^ Plancha 229, 2015, pp.46-55
  • ^ Plancha 303, 2002, p.26
  • ^ Moreno Sánchez et al., 2009, p.53
  • ^ Mantilla Figueroa et al., 2015, p.43
  • ^ Manosalva Sánchez et al., 2017, p.84
  • ^ a b Plancha 303, 2002, p.24
  • ^ a b Mantilla Figueroa et al., 2015, p.42
  • ^ Arango Mejía et al., 2012, p.25
  • ^ Plancha 350, 2011, p.49
  • ^ Pulido & Gómez, 2001, pp.17-21
  • ^ Plancha 111, 2001, p.13
  • ^ Plancha 303, 2002, p.23
  • ^ Plancha 348, 2015, p.38
  • ^ Planchas 367-414, 2003, p.35
  • ^ Toro Toro et al., 2014, p.22
  • ^ Plancha 303, 2002, p.21
  • ^ a b c d Bonilla et al., 2016, p.19
  • ^ Gómez Tapias et al., 2015, p.209
  • ^ a b Bonilla et al., 2016, p.22
  • ^ a b Duarte et al., 2019
  • ^ García González et al., 2009
  • ^ Pulido & Gómez, 2001
  • ^ García González et al., 2009, p.60
  • ^ Producción de crudo bajó en 30.879 barriles por día en 2017 - El Tiempo
  • ^ En 20 campos se produce el 66 % del petróleo del país - El Tiempo
  • ^ Oil reserves per department - 2016 - ANH
  • ^ a b Mojica et al., 2009, p.30
  • ^ ANH & Halliburton, s.a., p.2
  • ^ Castilla, área petrolera especial - El Tiempo
  • ^ ANH & Halliburton, s.a., p.3
  • ^ Chichimene
  • ^ Las reservas de campo Quifa se reducen en 5,9 millones de barriles
  • ^ a b Mapa de Tierras, ANH, 2017
  • ^ Caño Limón
  • ^ (in Spanish) Mapa de Territorios Indígenas y Minerales Preciosos
  • ^ a b (in Spanish) Producción de oroUPME
  • ^ a b (in Spanish) Producción de salUPME
  • ^ a b (in Spanish) Producción de carbónUPME
  • ^ a b (in Spanish) Producción de platinoUPME
  • ^ UpinatMindat.org
  • ^ San José del GuaviareatMindat.org
  • ^ Jaramillo & Dilcher, 2001
  • Bibliography

    [edit]

    General

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    Retrieved from "https://en.wikipedia.org/w/index.php?title=Llanos_Basin&oldid=1232255106"

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