GEOQUÍMICA DE CRUDOS DE LA FAJA PETROLÍFERA DEL ORINOCO, CUENCA ORIENTAL DE VENEZUELA / Geochemistry of Crude Oils from The Orinoco Oil Belt, Venezuela

摘要: Se presenta el estudio de biomarcadores S y los elementos traza V, Ni, Mo, Cr en crudos la Faja Petrolifera del Orinoco (FPO), Venezuela. Los resultados son interpretados relacion a su origen, correlacion procesos secundarios yacimientos. Todos estan biodegradados, con perdida n-alcanos isoprenoides pristano fitano. pueden distinguir tres grupos base al grado biodegradacion: Grupo A, nivel biodegradacion 4, presentan abundancia terpano triciclico (C23-3), sin evidencias alteracion hopanos (C29 C30), homohopanos (C31 C35) esteranos (C27-C29), ausencia demetilados. B, entre 6 7, presencia C, Basado patron distribucion isomeros metil-dibenzotiofeno, se deduce que fueron generados por una roca fuente litologia carbonatica, excepcion area Carabobo, rocas siliciclasticas. El indice metilfenantreno calculo reflectancia vitrinita (Rc), sugiere madura. Las relaciones V/Ni Mo/(Mo + Cr) las concentraciones indican familias (Grupos I, II, III). Sin embargo, no descarta posibilidad estos hayan sido sedimento bajo condiciones redox (Eh) variables ambiente sedimentacion. ABSTRACT This work presents the study of biomarkers, sulfur and trace elements in crude oils from Oil Belt, The results are interpreted based on identification origin oils, their correlation secondary processes reservoir. All biodegraded, with absence n-alkanes isoprenoids phytane pristane. Based scale biodegradation, three oil groups can be distinguished: Group A: level biodegradation 4 abundance tricyclic terpane without evidence alteration hopanes homohopanes to steranes (C27-C29); demethylated hopanes. B: presence C35), C: 7 characterized by abundant distribution pattern methyl dibenzothiophene isomers, all were generated carbonatic source rock, exception Carabobo area, which present generation siliciclastic rock. These have been mature methylphenanthrene index calculated vitrinite reflectance (Rc). ratios concentration indicate families (Groups Nevertheless, possibility that these same rock deposited under variable conditions cannot ruled out. Keywords: Crude Biomarkers, Trace elements, Alteration, Reservoir,