Artículos de revistas
New stratigraphic and genetic model for the dolomitic Cretaceous Pinda reservoirs in Angola: Part II - Compelling arguments against early dolomitization and early leaching
Nouveau modèle stratigraphique et génétique pour les réservoirs dolomitiques du Pinda (Crétacé, Angola). IIe Partie - Preuves irréfutables contre une dolomitization et une dissolution précoces;
Novo modelo estratigráfico e genético para os reservatórios dolomíticos Pinda (Cretáceo, Angola). Parte II - Provas irrefutáveis contra a dolomitização e a lixiviação precoces
Fecha
2019-01-01Registro en:
Carnets de Geologie, v. 19, n. 4, p. 47-70, 2019.
1634-0744
1765-2553
10.4267/2042/69773
2-s2.0-85065208621
Autor
Universidade Estadual Paulista (Unesp)
UBO
Institución
Resumen
This is the second contribution to the stratigraphic and genetic model of the Pinda Group. The mid-Cretaceous Pinda Group of the Congo basin in the northern Angolan offshore is a transgressi-ve supersequence. Its lower part is made of Bufalo and Pacassa facies that correspond respectively to mixed and calcareous-dolomitic grain-dominated fabrics. Both facies were strongly diagenetically alte-red, mostly by dolomitic replacement and leaching. Contrary to opinions expressed by other authors that both styles of alteration are early diagenetic phenomena, there is substantial evidence for a burial origin with dolomitic replacement and leaching of calcite having started at depths not less than 150 m and 400 m, respectively.