Interpretação sísmica do Campo de Marlim

Abstract

The Campos Basin is a mature basin where the hydrocarbon exploration began in the late 1960s. The first geophysical surveys resulted in the discovery of Garoupa field in the 1970s, followed by other fields that corroborated the production potential of the basin. In the 1980s, new 3D seismic surveys were acquired leading to the discovery of giant fields such as Marlim. In the present work, the objective is to perform a study aiming to improve the geological model of the Marlim field. To that end, a three-step interpretation workflow was developed. In step one, an integrated database that includes 3D seismic and available information of sixteen wells was built. In phase two, the well logs to accurately identify the stratigraphic markers used for the well/seismic calibration were reinterpreted. Four main marks were picked: Marco Cinza, Marco Azul, Topo do Sal and Base do Sal. In step three, was performed a detailed structural seismic interpretation by the identification of faults and features associated with halokinesis. The results led to identify two main tectonic domains (TD): TD I (rift), and TD II (halokinesis and gravitational tectonic), and interpreted two main faults herein denominated A (West) and B (East) which were responsible for the Campo de Marlim delimitation. In TD II, a strong structural control of the faults developed from salt tectonics was observed, as well as the formation of local depocenters for sedimentation from the Aptian up to the Miocene, thus making them essential for the Oligo-Miocene turbiditic reservoirs sedimentation.