Integrating 4D Seismic Interpretation and Water Saturation Estimation in the Well Reposition: Applications in Marlim Field, Campos Basin, Brazil

Abstract

In 2022, Petrobras launched its first revitalization project: the Marlim and Voador Revitalization Project (REVIT). This initiative aims to extend productive life of the Marlim Field, situated on Campos Basin, Brazil, which has been in operation for the last three decades. To achieve this goal, the project scope entails replacing eight existing platforms in the fields with two new platforms. The operation will involve managing a total of 75 wells of which, 14 will be new producer wells situated in the Marlim post-salt reservoir composed of turbidite lobes. To assist project implementation, 4D seismic data has been highlighted as an essential tool for identify unswept areas and delineate new well locations. However, reviewing the original well locations from 4D seismic requires a team analysis that integrates it with information from several knowledge areas such as geophysics, geology, and engineering. In a mature field, like Marlim, information on wells construction and submarine facilities is also necessary. These analyses take time impacting the project schedule. To mitigate this impact, it was proposed a calculation of water saturation from 4D seismic inversion results to support the 4D interpretation and speed up the necessary analysis. This estimated attribute has simplified the search for new areas to location optimization.