Secondary Porosity Control on Tight Carbonates from Salitre Formation(Neoproteroic):Case Study for Prediction in Pre-Salt Laminites(Barravelha Formation)

Abstract

Summary To reduce uncertainties for reservoir modelling and characterization, a commonly used approach is the study of surfaces analogous outcrops. The study was carried out in 5 outcrops of the Salitre Formation, located in the Irecê basin, in the state of Bahia. The rocks are composed of monotonous aggradational succession of deposits with a predominance of laminite facies with low primary permoporosity. The dataset includes a 3D numerical model, acquired with drone, lithological, geochemical and spectral gamma ray profiles and fracture parameters. Cyclic variations in the content of calcite and dolomite minerals partially control the mechanical state and susceptibility to dissolution in the analyzed sequences. The integration of mechanical attributes and the cycle control allows defining the recurrence of intervals with fracturing or dissolution in levels. The data that will be presented in the work were acquired in the Canyon of Rio Jacaré and the focus is on the area to the south near the region called Gruta dos Brejões ( Figure 1(C) ). The conceptual model based on the outcrop parameterization was applied in well core interpretation from pre-salt field in the Santos basin.