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Characterization of physicochemically abnormal coals in the matarere formation (Cerro Saroche National Park, Venezuela)
ArticleAbstract: Proximate and ultimate analyses, % R<inf>m</inf>, vitrinite anisotropy, Rock-Eval T<inf>max</inf>, aPalabras claves:Biomarkers, Cerro Saroche National Park, coal rank, organic petrography, vitrinite reflectanceAutores:A. Ruggiero, Escobar M., Esteves I.H., Fortes-Garrido J.C., Gonzalo Márquez, Manuel Martínez, Moreno O., O. Moreno, Ruggiero A.Fuentes:scopusTi/Zr ratio as a geochemical tool for the correlation of weathered coals from geological formations in two Latin American sedimentary basins
ArticleAbstract: Major and trace element concentrations in fresh and altered coals in outcrops and coalfields from TáPalabras claves:Coal, elemental ratio, inorganic geochemistry, seam correlation, weathering processesAutores:A. Álvarez, Érica Lorenzo, Escobar M., Fernando Morante-Carballo, Gonzalo Márquez, Manuel MartínezFuentes:scopusTrace elements of Paleocene Táchira coals, Southwestern Venezuela: A geochemical study
ArticleAbstract: The concentration and distribution of 35 elements in 78 coal samples from the Táchira State coal fiePalabras claves:Coal, factor analysis, geochemistry, Trace elements, VENEZUELAAutores:Carmen Milena López, Escobar M., Esteves I.H., Galarraga F., González R., Manuel Martínez, R. GonzálezFuentes:scopusSource-rock potential of the lowest coal seams of the Marcelina Formation at the Paso Diablo mine in the Venezuelan Guasare Basin: Evidence for the correlation of Amana oils with these Paleocene coals
ArticleAbstract: The aims of this work were to carry out a combined petrographic, palynofacies, and organic geochemicPalabras claves:Amana oils, Guasare bituminous coal, Lake Maracaibo Basin, Paso Diablo mine, Petroleum systemAutores:Carruyo G., Escobar M., Gonzalo Márquez, Juliao T.M., Manuel Martínez, Suárez-Ruiz I.Fuentes:scopusThe effects of sulfur on the weathering extent of carbon. A companson of two mines in Hato de la Virgin, State of Tachira, Venezuela
ArticleAbstract: Ten bituminous coal samples, showing several weathering levels, were collected at different depths iPalabras claves:Coal, geochemistry, OXIDATION, Sulfur, VENEZUELA, WeatheringAutores:Escobar M., Esteves I.H., Galarraga F., González R., Manuel Martínez, R. GonzálezFuentes:scopusV/Ni ratio as a parameter in palaeoenvironmental characterisation of nonmature medium-crude oils from several Latin American basins
ArticleAbstract: Statistical descriptive analyses were performed taking into account sulphur, vanadium and nickel conPalabras claves:crude oil group, generic diagram, oil prospecting, palaeoenvironmental characterization, vanadium:nickel ratioAutores:Galarraga F., Gonzalo Márquez, Llamas J.F., Manuel Martínez, Martïnez A., Reátegui K.Fuentes:scopusAssessment of the oil source-rock potential of the Pedregoso Formation (Early Miocene) in the Falcón Basin of northwestern Venezuela
ArticleAbstract: The early Miocene Pedregoso Formation is one of the numerous formations rich in organic matter withiPalabras claves:Biomarkers, Carbonate turbidites, Catagenesis, Falcón Basin, geochemistry, Organic matter, Redox conditions, Thermal maturity, VENEZUELAAutores:Gonzalo Márquez, Gutiérrez-Martín J.V., Manuel Martínez, Montero-Serrano J.C., Riboulleau A., Tribovillard N.Fuentes:scopusCorrelation between chemical, crystallographic and spectroscopic parameters in graphite thermometry applied to a contact aureole of la Soledad monzogranite (Venezuelan Andes)
ReviewAbstract: Graphite samples from a metamorphic contact aureole between phyllites of the Cerro Azul AssociationPalabras claves:Carbon isotopes, Contact metamorphism, graphite, Metapelites, Raman, VENEZUELA, XRDAutores:Manuel Martínez, Reátegui K.Fuentes:scopusCu (II), Cd (II) and Zn (II) adsorption by the Cuare Mangrove Peat, Falcon State, in different degrees of artificial maturation
ArticleAbstract: The high adsorption capacity of peat for heavy metals constitutes a complex phenomenon of economic aPalabras claves:Adsorption, Artificial maturation, Heavy Metals, PeatAutores:Escobar M., Manuel Martínez, Martinez V., Reátegui K.Fuentes:scopusChanges associated with field-scale demonstration in a steam-stimulated crude oil from the lagunillas oilfield (Lake Maracaibo, Venezuela)
ArticleAbstract: Cyclic steam injection with alkali is currently very commonly used to improve heavy-crude oil producPalabras claves:Biomarkers, carboxylic acids, cyclic steam injection with alkali, Lagunillas oilfield, viscous crudeAutores:Gonzalo Márquez, Hernández M., Manrique E., Manuel MartínezFuentes:scopus