PALEOGEOMORPHOLOGY OF THE BARRA VELHA FORMATION IN BLOCK A OF THE SANTOS BASIN, BRAZIL, AND ITS CONTROL OVER RESERVOIRS

The Barra Velha Formation is the main oil-bearing zone in the Santos Basin of Brazil. Paleogeomorphology controls the distribution of sedimentary facies and reservoirs, in addition to early diagenesis, that result in variation in reservoir types and quality. Comprehensive studies have been carried out based on well data, core data, well log data and seismic data by using imprinting method, residual thickness method, combined with compaction correction to reconstruct the paleogeomorphology of Bara Velha Formation. Four zones are recognized in the target area, i.e. deep water zone, slope and low structure zone, sub-high structure zone and high structure zone. The zones of high quality reservoir are recognized by the paleogeomorphology features, sedimentary facies and exposure environment.