An integrated approach for carbonate reservoir characterization: a case study from the Linguado Field, Campos Basin

Wagner Moreira Lupinacci,Antonio Fernando Menezes Freire,Danilo Jotta Ariza Ferreira,Rodrigo Bijani,Livia De Moura Spagnuolo Gomes

doi:10.1590/2317-4889202020190103

Wagner Moreira Lupinacci, Antonio Fernando Menezes Freire + Show 3 more

Open Access

https://doi.org/10.1590/2317-4889202020190103

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Abstract

Abstract The main reservoirs in the Linguado Field are grainstone and packstone carbonates composed of oolites, oncolites, pelloids, and rare bioclasts, of the Quissama Formation (Albian-age) and coquinas of the Coqueiros Formation (Aptian-age). Within Quissama Formation, facies have high porosity variations and their 3D characterization is of utter importance to allow for a better location of the wells. The objective of this study was a volumetric characterization of Quissama Formation by means of an adapted classical workflow composed of well-seismic tie, seismic preconditioning, seismic interpretation, seismic inversion, petrophysical properties estimation, and porosity geostatistical modeling. Seismic inversion results allowed the interpretation of a horizon to separate the carbonate platform in an upper zone, with low acoustic impedance, from a lower zone, with high acoustic impedance. Finally, behavioral knowledge of acoustic impedance and the porosity distribution within the Albian carbonate platform helped to better characterize the distribution of carbonaceous facies allowing the confirmation that commercial wells were drilled in low acoustic impedance and high porosity regions. It was also possible to confirm that a well, declared as noncommercial, was drilled in a poor reservoir region with high acoustic impedance and low porosity and identified other locations that were not yet drilled but could represent potential targets.

Highlights

The Campos Basin is in the southeastern portion of the Brazilian continental margin
The rift and post-rift sequences of the basin are represented by the Lagoa Feia Group and the drift sequence is represented from the base of the Quissamã Fm. to the seabed (Winter et al 2007)
In the Linguado Field, the Quissamã Fm. is formed by facies deposited in structural highs in a carbonate platform of preferential NE-SW direction, where higher-energy facies occur in the central part and the moderate energy ones in the flanks (Okubo et al 2015)

Summary

Introduction

The Campos Basin is in the southeastern portion of the Brazilian continental margin. It is limited by two structural highs, to the south by the Cabo Frio High, separating it from the Santos Basin, and to the north by the Vitória High, separating it from the Espírito Santo Basin (Fig. 1). The Quissamã Fm. was deposited during the Early to the Middle Albian age, during drift phase and represents the first sediments of marine environment, in a context of carbonaceous ramp along the NE-SW direction, with an average thickness of 800 m (Dias-Brito 1987, Guardado et al 1989, Okubo et al 2015). This Formation has as lower limit the evaporites of the Retiro Fm., and as upper limit a maximum flooding surface, denominated Marco Beta (Guardado et al 1989). Halokinesis played an important role in the sedimentary deposition of this sequence since it acted as a structural control through faulting and, reservoir compartmentalization (Spadini and Paumer 1983, Spadini et al 1988)

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