Delimitação de Reservatórios Delgados Utilizando Atributos Sísmicos

• Ano de defesa: 2005
• Autor(a) principal: Maul, Alexandre Rodrigo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal Fluminense; Programa de Pós-graduação em Geologia e Geofísica Marinha; Geologia e Geofísica Marinha; BR; UFF
• Palavras-chave em Português: Geologia marinha; Prospecção sísmica; Reservatórios; CNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA GEOLOGICA::GEOFISICA MARINHA
• Link de acesso: https://app.uff.br/riuff/handle/1/17751

The Carapeba Field, discovered in 1982, is located around 65 km from the coast, at 90 m water depth, and had its production started in 1989. The Carapeba s rock reservoirs are fine to coarse grained turbidite sandstones, locally conglomeratic, of Santonian age (around 85 Ma), at an average depth of 3000 m. These reservoirs are inserted in one of the most important petroliferous plays of the Campos Basin, within the continental shelf, in the Proximal Exploratory Compartiment.In this work, it is proposed to use seismic attributes in order to help the delimitation of thin reservoirs, below seismic resolution, which compose the Carapeba Field. Seismic attributes are any information derived from seismic data, either from direct or indirect measurements. For example, the arrival time of a seismic event and its dip are used to estimate the geologic structure. It is necessary to convert the vertical seismic scale from time to depth because the seismic data are originally recorded in two way travel time. For this conversion it was used a velocity model smoothed and calibrated with geostatistic techniques. To build the velocity model, velocity analysis data from seismic processing were utilized as external drift or secondary variables and check-shot (at the wells) as calibration points or primary variables. The main results obtained in this study indicate the confiability of the conversion model from time to depth, which permitted the right positioning of the production zones either in time or in depth, as well as the validation of seismic attributes to outline thin reservoirs, since the structural mapping by itself could not define the limits of the hydrocarbon occurrence zone. The combined analysis of the seismic attributes with structural mapping indicates possible explotatory target for this area. The seismic attributes illustrated the continuity of the reservoir facies, the indication of their lateral variability and their depositional organization.