Source-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 M. Escobar a,b , G. Márquez c, ⁎, I. Suárez-Ruiz d , T.M. Juliao e , G. Carruyo c , M. Martínez f a CARBOZULIA, Avenida 2 No. 55-185, Casa Mene Grande, Maracaibo 4002 A, Venezuela b Postgrado de Geología Petrolera, Facultad de Ingeniería, Universidad del Zulia, Maracaibo 10482, Venezuela c Departamento de Ingeniería Minera, Mecánica y Energética, Universidad de Huelva, La Rábida, 21819, Huelva, Spain d Instituto Nacional del Carbón (INCAR-CSIC), C/Francisco Pintado Fe 26, Ap. Co. 73, 33011, Oviedo, Spain e Instituto Colombiano del Petróleo, Autopista Piedecuesta, 681012, Piedecuesta, Santander, Colombia f Instituto de Ciencias de La Tierra, Universidad Central de Venezuela, Caracas, Venezuela abstract article info Article history: Received 28 March 2016 Received in revised form 31 May 2016 Accepted 4 July 2016 Available online 08 July 2016 The aims of this work were to carry out a combined petrographic, palynofacies, and organic geochemical study of twelve drill-core samples collected from the lowest coal seams in the Paleocene Marcelina Formation (Paso Diablo mine, Guasare Basin, northwestern Venezuela), to characterize crude oil samples from three wells in the nearby Amana Field and to evaluate oil-source correlations of these crude oils with the Paso Diablo coal ex- tracts. The coals under study were classified as high volatile bituminous A or at the B-A boundary, and showed vitrinite contents between 50.0 and 89.4 vol.%, liptinites ranging from 1.4 to 24.2 vol.%, and inertinites in the 6.2–30.8 vol.% range. Results from organic geochemical investigations indicate that the Guasare coals were gen- erated in a limno-telmatic to telmatic zone under fluctuating oxygen conditions. A Type III kerogen with relative- ly high hydrogen content and a thermal maturity corresponding to the early oil window are proposed for these coals as supported by Rock-Eval and petrographic data, as well as biomarker interpretations. Oil generation po- tential from Marcelina Formation coals is probably due to the perhydrous nature of the vitrinite, high bitumen contents, and considerable liptinite concentrations, mainly oil-prone resinites and exsudatinites. Palynofacies ob- servations denote a dominance of psilate pollen grains related to angiosperm plants and, as expected, Type III ker- ogens or humic coals in the studied seams, the parent material of which contained a significant contribution of algae. The non-detection of 18α(H)-oleanane does not preclude the fact that angiosperms are the dominant plants in the Guasare paleomire. On the other hand, the characterization of the Amana oils suggests that they all fall into a unique oil family; the presence of 25-norhopanes in them could indicate paleobiodegradation and mixing from various hydrocarbon charges in the reservoir. Thus, the crude oils from the Amana Field seem to be a mixture of one or more oil charges from the early mature marine carbonate source rocks of the La Luna Formation, deposited under anoxic reducing conditions, and a later pulse of hydrocarbon generation which originated from an unknown – so far – nonmarine source rock. In this regard, hydrocarbon liquid derived from the lowest Marcelina coal seams may be tentatively identified as the latter oil charge. Also, this work delin- eates some components of a currently subcommercial and hypothetical Tertiary petroleum system – identified and named as Marcelina/Misoa C5(.) – in the Lake Maracaibo region. Finally, the coalbed gas contents of sampled coals were determined. © 2016 Elsevier B.V. All rights reserved. Keywords: Guasare bituminous coal Paso Diablo mine Amana oils Petroleum system Lake Maracaibo Basin 1. Introduction The Paso Diablo open-pit mine is situated in the eastern foothills of the Sierra de Perijá (Guasare Basin, Zulia State, Venezuela), around 100 km northwest of Maracaibo (Fig. 1a). This important open-cut mine contains an estimated in-place resource of 1337 million metric tons of coal. The Guasare Coal Basin lies in the northwest Lake Maracaibo region and it is the most relevant in Venezuela due to both its size and the quality of its coal resources (Ruiz, 1983). Fig. 1b shows the Guasare Basin, located in the eastern flank of the Sierra de Perijá and extended between the Oca Fault, to the north, and the Totumo-Inciarte uplift, to the south. This sedimentary basin is structurally associated with the Manuelote Syncline (Miller, 1962). International Journal of Coal Geology 163 (2016) 149–165 ⁎ Corresponding author. E-mail address: gonzalo.marquez@diq.uhu.es (G. Márquez). http://dx.doi.org/10.1016/j.coal.2016.07.003 0166-5162/© 2016 Elsevier B.V. All rights reserved. Contents lists available at ScienceDirect International Journal of Coal Geology journal homepage: www.elsevier.com/locate/ijcoalgeo