Lacustrine Coquinas and Hybrid Deposits from Rift Phase Pre-Salt
Journal of South American Earth Sciences 95 (2019) 102254 Contents lists available at ScienceDirect Journal of South American Earth Sciences journal homepage: www.elsevier.com/locate/jsames Lacustrine coquinas and hybrid deposits from rift phase: Pre-Salt, lower T Cretaceous, Campos Basin, Brazil Vinicius Carbone Bernardes de Oliveiraa,b,*, Carlos Manuel de Assis Silvaa, Leonardo Fonseca Borghib, Ismar de Souza Carvalhob a Petrobras Research and Development Center (CENPES), Avenida Horacio de Macedo, 950, Ilha do Fundao – Cidade Universitaria, Rio de Janeiro, RJ, 21949-915, Brazil b Universidade Federal do Rio de Janeiro, Centro de Ciencias Matematicas e da Natureza, Instituto de Geociencias, Departamento de Geologia, Programa de Pos-graduacao em Geologia, Av. Athos da Silveira Ramos, 274, Bloco F, Ilha do Fundao – Cidade Universitaria, Rio de Janeiro, RJ, 21949-900, Brazil ARTICLE INFO ABSTRACT Keywords: This study presents a facies characterization, facies succession and conceptual depositional model of the Pre-salt Coqueiros Formation, Lower Cretaceous of Campos Basin, based on core analyses of two wells. WELL-1 is a Rift sedimentation shallow water drilling located at south of Campos Basin within the Badejo structural high, and WELL-2 is an ultra Coquinas deep water drilling located at north, over the “External High”. Ten carbonate facies, three siliciclastic facies, two Hybrid deposits magnesium clay mineral rich facies and two hybrid facies were identified. The carbonate facies were defined as Lower cretaceous rudstone, grainstone, packstone and mud supported carbonate rock, composed of bivalves, ostracods, and rare gastropods. Bivalve shells, mostly disarticulated with distinct degrees of fragmentation, characterized the main components of the ten carbonate facies.
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