A new geological model based on a seismic-stratigraphic analysis of the eastern inhambu oil field, onshore espírito santo basin, Brazil

Abstract

The Espírito Santo onshore basin is an important hydrocarbon province on the eastern Brazilian continental margin that accounts for almost 9% of Brazil’s onshore oil production. This study aims to understand the stratigraphy and geologic evolution of the eastern Inhambu onshore oil field from the post-rift section (Cricaré Formation, Mucuri Member) to the drift section (Rio Doce Formation). We interpret the main stratigraphic surfaces and seismic facies from the basement to the upper pre-Eocene unconformity to build a chronostratigraphic chart and identify the main transgressive and regressive events. Lithological and geophysical logs from new wells allowed the identification of six 3rd-order cycles, including four regressive and two transgressive events. Based on these results, a new conceptual geological model for the eastern Inhambu Oil Field is proposed.