RT Journal Article
T1 Study on spatio-compositional variations and source facies for oils from the Central Wrench Corridor of the Oriente Basin (Ecuador)
A1 Márquez Martínez, Gonzalo
A1 González, Lenin
A1 Permanyer, Albert
A1 Boente López, Carlos
A1 Guzmán, Marco Antonio
A1 Lorenzo García, Erica
AB This research paper contains an integration of classical biomarker work with higher diamondoid examination to better characterize the petroleum systems in the north-central portion of the Sacha-Shushufindi Corridor in the Ecuadorian Oriente Basin. A set of crude oils, cuttings, and outcrop rock samples were analysed to address aspects such as source-rock lithology, paleo-depositional conditions, migration distances, as well as oil-oil and oil-source correlations. For this, gas chromatography-mass spectrometry (GC-MS), GC-triple-quadrupole MS (GC-MS/MS), and carbon isotope ratio mass spectrometry (IRMS) were performed on maltene fractions both from oils and rock extracts.GC-MS/MS analyses of oil-derived asphalthene hydrous pyrolysates were also included on the study. Classical biomarker results suggest mixing of pulses from distant siliciclastic and carbonate-rich Napo source rocks, with former oil charges being slightly biodegraded during the Paleogene and fresher Neogene pulses. These two types of Early-Late Cretaceous source rocks were deposited in shallow marine to nearshore and low-oxygen inner to middle neritic environments, respectively, with considerable and scarce contribution of land-plant material in both cases. Such differentiation of the two source facies types of the Napo Group is supported by results from quantitative extendeddiamondoid analysis (QEDA).
PB Elsevier
SN 0895-9811
SN 1873-0647 (electrónico)
YR 2022
FD 2022
LK https://hdl.handle.net/10272/24603
UL https://hdl.handle.net/10272/24603
LA eng
NO Márquez, G., González, L., Permanyer, A., Boente, C., Guzmán, M. A., & Lorenzo, E. (2022). Study on spatio-compositional variations and source facies for oils from the Central Wrench Corridor of the Oriente Basin (Ecuador). In Journal of South American Earth Sciences (Vol. 113, p. 103672). Elsevier BV. https://doi.org/10.1016/j.jsames.2021.103672
NO Authors are grateful to Professors Galo Montenegro (ESPOL) and Marcos Escobar† (LUZ) for his scientific assistance and facilities to the samples. Carlos Boente obtained a post-doctoral contract within the program PAIDI 2020 (Ref 707 DOC 01097), co-financed by the Junta de Andalucía (Andalusian Government) and the EU. We are also grateful to the two reviewers for their comments which helped to improve the original version of this manuscript.
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026