Saber UCV
Repositorio Institucional
Repositorio Institucional
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https://saber.ucv.ve/handle/10872/16009
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| Title: | Comparison of crude oil source-related indicators based on C15-, C15+ and C40+ parameters |
| Authors: | López, Liliana Lo Mónaco, Salvador |
| Keywords: | Biomarkers, Organic facies, Sedimentation environment, Gas chromatography, Marine deposits, Crude oils. |
| Issue Date: | Jun-2016 |
| Publisher: | CT&F - Ciencia, Tecnología y Futuro |
| Series/Report no.: | 6;3 |
| Abstract: | This work presents a comparative study of source-related indicators based on parameters determined in the C15-, C15+ and C40+ fractions in oil from the Barinas sub-basin, Venezuela. The objective was to determine whether the results obtained from High Temperature Gas Chromatography (HTGC-C40+) for the definition of organic facies and maturity, along with obtained by Whole-Oil Gas Chromatography (WOGCC15-), to define maturity and secondary processes at the reservoirs are comparable with those obtained from biomarkers (GCMS-C15+). WOGC detected the presence of n-C5 to n-C9 alkanes, benzene and toluene, and the lack of these components indicates water washing. Oils from Caipe, La Victoria, Silvan, and Guafita not show biodegradation or water washing; Sinco show water washing and La Victoria and some from Guafita and Silvan oils presented evidence of evaporative fractionation. Biomarkers indicates that the oils derived from marine, algal and bacterial organic matter with variation in terrigenous organic matter input generated by a mature source rock with different lithofacies (siliciclastic-carbonatic). Based on CPIa (C42-C46) five oils have values > 1, which is associated with marine depositional environments. However, 21 samples have CPIa=~1, which considered typical of freshwater lacustrine environments, which differs from those determined in previous works based on biomarkers and isotopic studies. Este trabajo presenta un estudio comparativo de indicadores de fuente basados en el estudio de parámetros determinados en las fracciones C15-, C15+ y C40+ en crudos de la sub-cuenca de Barinas, Venezuela. El objetivo fue determinar si los resultados obtenidos a partir de cromatografía de alta temperatura (CGAT-C40+) para la definición de facies orgánicas y madurez, junto con los de cromatografía de crudo total (CGCT-C15-), para definir madurez y procesos secundarios en el yacimiento son comparables con los obtenidos de biomarcadores (CGEM-C15+). CGCT detectó alcanos entre n-C5 a n-C9, benceno y tolueno, y la ausencia de estos compuestos indicó lavado por aguas. Los crudos de Caipe, La Victoria, Silvan y Guafita no presentan biodegradación o lavado por aguas, Sinco presenta lavado por aguas y La Victoria, y algunos de Guafita y Silvan presentan fraccionamiento evaporativo. Los biomarcadores indicaron un origen de materia orgánica marina, algal y bacterial; con variaciones en el aporte de materia orgánica terrígena, en una roca fuente madura con distintas facies litológicas (siliciclásticas-carbonáticas). Basado en CPIa (C42-C46), cinco crudos tienen valores > 1, asociado a ambientes de sedimentación marinos. Sin embargo, veintiún (21) crudos tienen CPIa=~1, relacionado a ambientes lacustres de aguas dulces, lo que difiere de estudios previos basados en biomarcadores e isótopos. |
| URI: | http://hdl.handle.net/10872/16009 |
| Appears in Collections: | Artículos Publicados |
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