01863nab a2200181 4500 20260520001832.0 260224s2010 xxu Main factors controlling the compositional variability of seepage oils from Trujillo State, western Venezuela jul. 2010 20/07/2010 ; 20/07/2010 14 p. ; 255-268 Transcripción del resumen del autor. 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. 3 Journal of Petroleum Geology 33 ARTICULO Galarraga, F. 45760 175094 175094 0 0 0 0 242913 BAAB BAAB 2026-03-05 200046976 0 200046976 2026-03-05 18:52:37 2026-03-05 ARTICULO