SciELO - Scientific Electronic Library Online

 
vol.25 número2Diseño de un co-laboratorio remoto basado en programación modular de dispositivos VHDL aplicado a telecomunicacionesEstudio de perfiles de meteorización lateríticos de los alrededores de Upata, estado Bolívar índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

  • No hay articulos similaresSimilares en SciELO

Compartir


Revista de la Facultad de Ingeniería Universidad Central de Venezuela

versión impresa ISSN 0798-4065

Resumen

AZUAJE, Evelyn et al. GEOCHEMICAL CHARACTERIZATION OF ROCKS IN A CRETACEOUS SEQUENCE IN LAGO DE MARACAIBO BASIN. Rev. Fac. Ing. UCV [online]. 2010, vol.25, n.2, pp.13-27. ISSN 0798-4065.

The Maracaibo basin has been catalogued as one of the most important basins worldwide, the La Luna Formation (FLL) being the main source rock. Nonetheless, other formations have been defined as source rocks of secondary importance. This is the case of some of the formations included in the Cogollo group (Apón and Maraca formations). The purpose of this study was to determine and compare geochemical parameters in order to characterize the Cretaceous sequence represented in the well core 26D-2. In order to do that, first a physical description of the samples was made, together with mineralogical analyses and the determination of the total carbon, inorganic (carbonate) and total organic carbon (TOC). Rock-Eval pyrolysis analyses were also made to determine the type of kerogen and the maturity range of the samples. The bitumen was extracted and separated into maltenes and asphaltenes. The maltene fraction was then separated in saturate and aromatic hydrocarbons and resins. To obtain both biomarkers and aromatic markers, a gas chromatography coupled with mass spectrometry (GC/MS) analysis was done. Lastly the asphaltene fraction was analyzed using gel permeation chromatography to determine the molecular weight in number (Mw) and in weight (Mw). Considering the results obtained through pyrolysis, biomarkers and aromatic markers, the Cretaceous sequence analyzed presented a mixed organic matter input, the sedimentary facies were marine, carbonatic and siliciclastic and the samples show an early to intermediate maturity range

Palabras clave : Geochemistry; Carbon; Asphaltenes of bitumen; Biomarkers; La Luna; Apón; Lisure; Maraca.

        · resumen en Español     · texto en Español