Abstract

POSADA, C. R et al. GEOQUÍMICA DE YACIMIENTOS DE LA FORMACIÓN CABALLOS EN EL CAMPO ORITO. PUTUMAYO-COLOMBIA. C.T.F Cienc. Tecnol. Futuro [online]. 2001, vol.2, n.2, pp.105-124. ISSN 0122-5383.

A total of twenty oil samples from the Onto Field in the Putumayo Basin at the South of Colombia were analyzed to define the genetic relationship of the hydrocarbons produced from the Caballos and Pepino Formations, to establish the compartmentalization in the reservoirs of the Caballos Formation, so as to study the phenomena that caused the compositional changes of crude before and after the production. The samples were analyzed for bulk parameters, whole oil gas chromatography, light fraction gas chromatography, biomarkers and carbon isotopes. The results are presented using star diagrams, crossplots, cluster diagrams and iso-value maps. It was found that the compositional differences of the produced hydrocarbons from the Pepino and Caballos Formations are produced by the fact that the crude were originated by different source rocks each one with different grades of thermal maturity. There were defined two compartments: North Dome and South Dome for the Caballos Formation reservoir. The compartmentalization is caused by faults that play a role when the trap was filled. They have acted as partial seals isolating the different sectors and causing heterogeneity in the crude composition. The integration of this geochemistry information with the static and dynamic models of the reservoir lead to define different sectors to guide the simulation study of the field. Also some sectors of interest have been identified to carry out development new drilling opportunities in the North Dome.

Keywords : geochemistry; reservoir geochemistry; onto field; putumayo basin; caballos formation; compartmentalization; compositional change.

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