Evaluation of Petroleum Exploration Potential in Ucayali Basin,Peru
Received date: 2011-11-26
Revised date: 2012-01-16
Online published: 2012-04-10
Ucayali basin in the Peru is one of the greatest abundance petroleum Sub Andean foreland basins in the South America.Although the degree of petroleum exploration is now low,it is highly prospective with 12 oil and gas fields and about 4.7 billion proved oil equivalent reserves.Based on seismic integration,drilling and core analysis data,we evaluate the general petroleum geological conditions in the Ucayali basin,including source rock,reservoir rock,cap rock and trap;and then we point out the favorable exploration area and potential goal.The results indicate that there are three sets of source rocks with high organic carbon and mature stage in the Ucayali basin,i.e.Triassic-Jurassic Pucara,Permian Ene and Carboniferous Ambo.Three sets of source rocks provided the petroleum toward the north,middle and south,respectively.The main exploration targets are Cretaceous Cushabatay and Vivian sandstones.The trap types are anticline,faulted anticline and fault nose formed under compressional tectonic background,as well as lithologically subtle traps.The basin has wide exploration domains and huge potential,the most favorable area for exploration is Urubamba subbasin in the southeast of the basin and folding and thrusting belt in the west of the basin.All oil and gas fields are discovered in the structural traps and most of them are located in the hanging wall of thrusting fault.The exploration to the footwall of thrusting fault is poor.Therefore,the exploration targets in the basin should focus on the following two aspects: structural traps (especially footwall traps) and subtle traps.In the subtle trap,the lithological traps should be paid more attention,such as Permin Ene Formation buried hill,Triassic-Jurassic Pucara bio-reef and Cretaceous channel sands.
Key words： Ucayali basin; Petroleum geology; Exploration potential; Subtle trap; Foreland basin; Peru.
Zhang Shen,Tian Shi-cun,Guo Jian-yu,Xiao Fang-feng . Evaluation of Petroleum Exploration Potential in Ucayali Basin,Peru[J]. Natural Gas Geoscience, 2012 , 23(2) : 268 -278 . DOI: 10.11764/j.issn.1672-1926.2012.02.268
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