Abstract

Summary The Pelotas Basin in southern Brazil, spanning onshore and offshore areas, has seen exploration since the 1950s, with few wells and seismic lines and no hydrocarbon discoveries. Inspired by Namibia's Orange Basin, this study reassesses the basin, proposing new exploration methods. Geologically, the Pelotas Basin is a passive volcanic margin with volcanic rift systems, showcasing extensive rock formations. The main reservoir rocks are in Atlântida Formation's turbiditic bodies, and Albian carbonates in Porto Belo Formation act as secondary reservoirs. The petroleum system suggests oil potential, focusing on Atlântida–Porto Belo(?) and Atlântida–Atlântida(?) systems, with stratigraphic traps and short-distance hydrocarbon migration. Opportunities include Albian turbidites and carbonate reservoirs over igneous rocks. Despite challenges in delineating turbidites and carbonates due to limited 2D seismic data, the study stresses the need for new seismic data. Examples show fluid evidence, encouraging more exploration in Pelotas Basin's Albian-Turonian plays. The study aims to unlock the basin's untapped potential with innovative strategies.