RT Journal Article
T1 Using gas geochemistry to delineate structural compartments and  assess petroleum reservoir-filling directions: A Venezuelan case study
A1 Márquez Martínez, Gonzalo
A1 Escobar, Marcos
A1 Lorenzo García, Erica
A1 Gallego, Jose Ramón
A1 Tocco, R.
AB Here we examined the light hydrocarbon and nitrogen content and isotopic signatures of eleven gaseous samples in order to evaluate lateral intra-reservoir continuity in a Venezuelan reservoir in the central area of Lake Maracaibo Basin. At least three single compartments, located in the northern-central and southern parts of the reservoir, are revealed by nitrogen concentrations showing clear step-like compositional breaks. The occurrence of step-breaks was also supported by the isotopic signature of individual hydrocarbon compounds in the range of C1 to C4 alkanes. Samples presented only slight differences in N2 and hydrocarbon gas compositions within the central and northern parts of the reservoir, and therefore it was not possible to infer structural barriers in coherence with the geological section. Some oil bulk parameters corroborate gradual changes that provide additional information on the reservoir-filling history, thus suggesting that the lateral physical-chemical equilibrium of fluids was not reached in this reservoir.
PB Elsevier
SN 0895-9811
SN 1873-0647 (electrónico)
YR 2013
FD 2013
LK https://hdl.handle.net/10272/24906
UL https://hdl.handle.net/10272/24906
LA eng
NO Márquez, G., Escobar, M., Lorenzo, E., Gallego, J. R., & Tocco, R. (2013). Using gas geochemistry to delineate structural compartments and assess petroleum reservoir-filling directions: A Venezuelan case study. In Journal of South American Earth Sciences (Vol. 43, pp. 1–7). Elsevier BV. https://doi.org/10.1016/j.jsames.2012.12.008
NO Authors are grateful tothe company Perenco foraccessing tothe samples. We also thank the two anonymous reviewers for their comments which helped to improve the original version of this work.
DS Repositorio Institucional de la Universidad de Huelva
RD 13 jul 2026