Petroleum Systems of the Northwestern Tachira Depression, Venezuelan Andes: ABSTRACT

Ostos, Marino; Callejon, Angel; Suhas, .

doi:10.1306/64ed9592-1724-11d7-8645000102c1865d

Cited by 1 publication

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“…are associated to both, Orocué and La Luna (8,9). Other possible source rock is the Capacho Formation, with siliciclastic source rock from marine origin (7,10).…”

Section: Geology and Geochemistrymentioning

confidence: 99%

“…The oils in this petroleum system come from non-marine source rocks with input of terrigenous organic matter in mixtures with oils from a marine organic matter from La Luna Formation. The Orocué petroleum system is considered hypothetical, due to the lack of a clear determination of oils-source rock correlations that would allow to properly establish the origin of these oils (8,9). Additionally, the influence of oil mixture over the quality of oils in the reservoirs has not been established.…”

Section: Geology and Geochemistrymentioning

confidence: 99%

“…systems was proposed with the identification of oil from the Paleocene(? )-middle Eocene (46), and Los Cuervos and Carbonera formations have been proposed as excellent potential source rocks (9). However, the low maturity of coals from Barco, Los Cuervos and Carbonera formations indicates low potential to generate and expel oil (5,8,47) because in coals, the beginning of generation is related to Tmax of 435 °C (45), and the reported values of Tmax for these formations are in the range of 451-458 °C (3 samples from Barco Fm.)…”

Section: Origin Of Oils From Los Manueles Fieldmentioning

confidence: 99%

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Assessment of terrigenous and marine sourced oils mixtures: Los Manueles field, Maracaibo basin Venezuela

López

Crespo

Mónaco

et al. 2022

CT&F Cienc. Tecnol. Futuro

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Seven crude oil samples from Los Manueles field, Maracaibo Basin, Venezuela, were analyzed to evaluate oil mixtures associated with different oil charges into the reservoirs. Analyses of the bulk physicochemical parameters suggest variations in the API gravity, the concentration of saturated and aromatic hydrocarbons, NSO compounds + asphaltenes, sulfur, vanadium, nickel, and the biomarkers distribution. The oils were divided in two groups: G-I with high saturated hydrocarbons and low NSO compounds + asphaltenes, sulfur, vanadium and nickel, a bimodal distribution of n-alkanes, high Pr/Ph and oleanane index, low steranes index, low abundance of tricyclic terpanes and C35S/C34S < 0.54 and G-II with low saturated hydrocarbons and high NSO compounds+ asphaltenes, sulfur, vanadium and nickel, an unimodal distribution of n-alkanes with low Pr/Ph and oleanane index, high steranes index, abundance of tricyclic terpanes and C35S/C34S > 0.70. G-I has a higher contribution of terrigenous organic matter compared to G-II, characterized by a higher contribution of marine organic matter. Source rock lithology biomarker indicators suggest marine shale as the source rock for oils of terrigenous origin. The results indicate that oils were generated by two independent source rocks, La Luna Formation and a secondary source rock with terrigenous organic matter, probably represented by the Capacho Formation.

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“…are associated to both, Orocué and La Luna (8,9). Other possible source rock is the Capacho Formation, with siliciclastic source rock from marine origin (7,10).…”

Section: Geology and Geochemistrymentioning

confidence: 99%

Section: Geology and Geochemistrymentioning

confidence: 99%