Modelagem geofísica 3D de dados GPR em análogos a reservatórios carbonáticos com a utilização de atributos geométricos: estudo de caso na formação Coqueiro Seco, Bacia de Sergipe-Alagoas

• Autor(a) principal: Takayama, Patricia
• Data de Publicação: 2008
• 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/1/7103
• topic: Geophysics; GPR; Reservoirs; Attributes; Geofísica; GPR; Reservatórios; Atributos; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA

Recent petroleum reserves discoveries in carbonates reservoirs have increased the interest in this kind of reservoir. However, deficit information about this kind of system has motivating new researches to reach best understanding about this subject. Modeling of architecture in a porous system is an example of this research, because through modeling is possible to extract important parameters, such as porosity and geometry of reservoirs, which have influence on petroleum reserves and production. The purpose of the present work is modeling the Morro do Chaves Member (Coqueiro Seco Formation) carbonate reservoir, which could be used like an analogue to Lagoa Feia Formation carbonate reservoir, located in Campos Basin. The present modeling was realized from acquisition of 3D GPR composed by fixed-offset lines in Pedreira do Atol, located in Alagoas State. The 3D volume was interpreted applying radar-stratigraphic methodology and seismic attributes (DIP and Coherence). These methodologies allowed characterize seven litostratigraphic units, each one represented by its geophysics signature. The seismic attribute DIP helps to discriminate litostratigraphic units and to determine reflectors dip. Through integration of present interpretation and published data of this area was possible to be sure about mapped sequences and associated depositional environment. Coherence attribute turned possible to interpret incoherence zones inside of 3D GPR volume. These incoherencies were associated to faults or fractures on the rocks. This information is very important to estimate porosity and permeability of rocks in this area. The strike s mapped rocks are coincident to basement s regional structural framework. One possible interpretation is that these basement faults could have acted as conditioning factors during coquinas sedimentation.