Repositorio Institucional de la Universidad de Oviedo

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C.N. Cardoso was supported by a fellowship of Sandwich Doctoral Abroad (Process no BEX 1884/13-1) from the CAPES Foundation (Coordenaca˜o de Aperfeic¸oamento de Pessoal de Nivel Superior), Ministry of Education of Brazil. This work has the financial support (Grant no 2010.2608-7) of the Agencia Nacional do Petróleo, Gás Natural e Biocombustíveis (ANP). The authors thank T. Kumpan and the editors (G. Escarguel and C. Girard) for their constructive comments on the manuscript. They wish to express their gratitude to PETROBRAS–Petróleo Brasileiro S.A. and N.S. Matsuda for having provided the samples investigated herein, and A.J. Quintana García (Scientific-Technical Services, University of Oviedo) for his assistance with the scanning electron microscope.