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The Parque das Baleias, located in the northern part of Campos Basin, is a region that contains fields with expressive volumes of petroleum in the pre-salt and in the post-salt domains. The Carapebus Formation contains the most important post-salt reservoirs in the area, constituted by turbiditic deposits from the Upper Cretaceous to the Lower-Miocene. Due to the complex geometry and heterogeneity, the evaluation of these reservoirs is a challenge in terms of petrophysical studies. This work analyses the Carapebus Formation based on well logs and calibrated with the description of rock samples to study the lithological heterogeneities in the reservoir. The evaluation in terms of log facies, porosity and clay volume exhibits the sandstones heterogeneity in terms of grain size and selection, with intercalations of siltstones and shales that segment the reservoir in zones. Also, the presence of feldspars in sandstones motivated the use of different methods to assess the clay volume and evaluate the quality of reservoirs.

The importance of rock-log calibration for a correct evaluation of the Carapebus Formation reservoirs in the Parque das Baleias, Campos Basin, offshore Brazil