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Título : MAIN FACTORS CONTROLLING THE COMPOSITIONAL VARIABILITY OF SEEPAGE OILS FROM TRUJILLO STATE, WESTERN VENEZUELA
Autor : Galarraga, Federico
Urbani, Franco
Escobar, Marcos
Marquez, Gonzalo
Martínez, Manuel
Tocco, Rafael
Palabras clave : oil seeps
Venezuela
biodegradation
water washing
hydrocarbon flow rate
Trujillo State
Fecha de publicación : 26-Mar-2014
Citación : Journal of Petroleum Geology;Volumen 33, No. 3, 255-268
Resumen : The organic geochemistry of eighteen samples of seepage oils from Trujillo State, Western Venezuela, was investigated. These oils are probably derived from the predominantly marine Cretaceous La Luna Formation which is near peak maturity for oil generation. A range of biomarkers (n-alkanes, acyclic isoprenoids, phenanthrene and alkyl-phenanthrenes, as well as dibenzothiophene and alkyl-dibenzothiophenes) were analysed by gas chromatography - mass spectrometry (GC-MS). The seepage oils have been modified as a result of water washing and biodegradation. A first group of samples were slightly biodegraded with the partial loss of n- and iso-alkanes. Other samples fall into two groups: those that are moderately degraded, with partial depletion of acyclic isoprenoids; and those that are severely altered, as indicated by the partial or total absence of hopanes. One objective of this work was to evaluate the factors influencing the compositional differences of the three samples sets. In-situ measurements, together with the interpretation of the geochemical data, suggest that diverse factors were responsible for these variations. These included different degrees of alteration due to biodegradation and water washing, as well as differences in flow rate towards the surface.
URI : http://saber.ucv.ve/jspui/handle/123456789/5770
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