Identificação e avaliação de reservatórios do tipo shale oil/gas no Campo de Cexis, na Bacia do Recôncavo, através de interpretações sísmicas, geoquímicas e de perfis de poços

• Autor(a) principal: Nascimento, Caroline Adolphsson do
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/7033
• topic: Unconventionals; Shale Oi; Recôncavo Basin; Cexis Oil Field; Gomo Member; Seismic Interpretation; Recursos Não Convencionais; Shale Oil; Bacia do Recôncavo; Campo de Cexis; Membro Gomo; Interpretação Sísmica; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA

The interest regarding the unconventionals reservoirs have been increased due to the continuous worldwide expansion for new energy source demand, becoming a major play in the current energetic political scenario. Brazil has a promising future in respect to the exploration from this type of resource, the country is already the tenth in shale gas recoverable reserves in the world. In the 12th national bid round from ANP, it was offered blocks for the oil and gas exploration for unconventional reserves, returning to mature onshore basin areas such as Recôncavo Basin. Due to the fact that there are still some obstacles in relation to the country's shale/oil gas exploration, such as the limited research involving the subject in the Brazilian basin, the main goal from this dissertation project was to propose a workflow that could provide the identification, characterization and evaluation from the unconventionals reservoir from Cexis Field in Recôncavo Basin. For that purpose, seismic interpretation, geochemical and well log analysis were made. The first stage was comprised by seismic interpretation, from which the structural settings of the area was visualized, with the preferential dip of the layers dipping to the southwest, influenced by the relief fault system NW-SE. In the second stage, the stratigraphic correlation of the wells was performed, using the principles of sequence stratigraphy for rifte-type basins, which pointed to the Rifte Climax Tectonic Tract as the most probable for the preservation of large amounts of organic matter. The next step was the correlation of the wells from the geochemical intervals rich in organic matter. The next step was the correlation of the wells from the geochemical intervals rich in organic matter. Based on the thermal evolution of the organic matter and the pyrolysis data, it was possible to highlight the intervals of greatest economic interest, whose depth of burial has ideal thermal maturation and whose organic matter has quality for the generation of oil. They are: Lower Gomo, Intermediate Gomo and Upper Gomo. The analysis of the geophysical well logs and the descriptions of the trough samples showed that the shales of the zones of interest have favorable composition for the production of shale oil reservoirs. The well logs have also adequate responses to the presence of hydrocarbons and organic matter, besides characteristics that suggest the presence of fractures. The described steps allowed the estimation of the oil potential in the Gomo Member intervals, where a lower estimate of 493 million barrels was found in the three geochemical interest intervals. The dissertation presented a multidisciplinar workflow that provided the reach of its main objectives. It also proposes the application of the used methodology in future studies in other areas in the Recôncavo basin to the shale oil and/or shale gas investigation