RT Journal Article
T1 Caracterización geoquímica del petróleo de los reservorios de la Fm Napo del Cretácico (Ecuador) y su relación con las lutitas intercaladas como roca generadora de hidrocarburos
T1 Oil geochemical characterization in the Cretaceous Napo Formation reservoir (Ecuador) and its relationship withthe interbedded shales as hydrocarbon source rock
A1 Estupiñán Letamendi, Jenny
A1 Permanyer, Albert
A1 Marfil Pérez, Rafaela
AB The Napo Formation from the Cretaceous age is located in the Oriente basin in Ecuador and iscomposed of limestones, shales, and sandstones, the «U» and «T sandstones», which are the most importantreservoirs in the basin. The formation was deposited in fluvial, transitional and marine environments, andtheir correlation with the sequence stratigraphy may be associated with the fluctuation of the eustatic sealevel. This work presents the analyses of the organic composition and the thermal maturity of the shalesinterbedded in the sandstones reservoir. Furthermore, the geochemical characterization of oils from the«U» and «T» reservoirs was preformed. The analyses were performed to establish the contribution of theshale as a source rock in the generation of the hydrocarbons. The spatial trend of the TOC in the shalesvaries from 1,78% in the Eden-10 well, located in the eastern part of the basin to 0,56% in Jivino-1 welllocated in the center of the basin. The hydrogen index (IH) varies from 116 to 414 mg/g, and the thermalmaturity expressed as Tmax shows values of 445ºC. Oil studies show the relationship between tricyclicterpanes (C20/C23) and trisnorhopane/trisnoneohopane (Ts/Tm) among others biomarkers. These data suggesta marine origin and the thermal maturity is compatible with foundin thats the shale shows (reflectanceequivalent of 0,6% - 0,9%, deduced from the analyses of the regular steranes isomerization). Theinterpretation of all the analyses suggests that the interbedded shales in the «U» and «T» sandstones couldhave contributed to the source of the hydrocarbon oil in the Oriente basin
YR 2009
FD 2009
LK http://hdl.handle.net/10272/8018
UL http://hdl.handle.net/10272/8018
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026