Abstract
The aim of this study is to evaluate hydrocarbon distributions (C15− and C15+) in theMisoa Formation oils from the Centro Lago Field (Lake Maracaibo, western Venezuela).Detailed geochemical analyses of 38 crude oils from various producing sands (B-X, C2, C3, C4,C5 and C6) indicate that the oils are derived from the same source rock (La Luna Formation) andthat they were formed during the main phase of hydrocarbon generation and expulsion.Migration-fractionation is considered as a possible contributor to changes in crude oilcomposition. However, little variations in the organic facies of La Luna Formation or multiplecharge process (reservoir filling) could explain the compositional differences. On the basis of theanalysis C15− organic compounds, we differentiated various crude oil families in the CentroLago Field. The reservoir is composed of four principal oil families: B-X crude oils in CLA-237and CLA-346, C2 crude oils, C3 and C4 oils of the south dome (except CLA-233 for C3 andCL-24 and CLA-238 for C4 and, C4 (north dome) and C5 oils form an oil family with similarchemical composition.
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