Uso Da Sísmica 3D Na Modelagem De Reservatórios

Processing and interpretation techniques development has allowed the improvement of reservoir<br>characterization using seismic data. Cherne Field, off-shore Campos Basin, Brazil, was the target of a<br>multidisciplinary geologic modelling project. The main reservoir is composed of albo-cenomanian turbidites of<br>Macae Formation in a structured area, separated in blocks by salt tectonics. After structural interpretation, a<br>stratigraphic inversion had made. Mapping of internal reservoir geometry was performed with the resulting<br>impedance data. Various depositional cicles related with sea level variations were interpreted. Each cicle is<br>represented by lowstand porous sandstone in low impedance reflectors, and transgressive deposits of high<br>impedance (marls and interbedded fine sandstones). The first cicle was deposited in a restricted condition,<br>resulting in a continuous reflector, onto a carbonatic platform. The next cicles were conditioned by the area<br>creation due to the sea level variations and halocynesis, giving a progradational character to the horizons. The<br>last event is a radioactive mark that indicates the basin flooding. The stratigraphic zoning of the reservoir was<br>made with seismic background. The interwell correlation was guided by the horizons intepreted. Five events<br>were identified. The attributes extraction was made according to the volumetric mean value in each seismic unit.<br>A linear correlation between seismic atributes and electrofacies frequency was found for most of the zones. A<br>permoporous cube was generated with geoestatistical tools using atribute data as a secondary variable ready<br>for usage in the numerical reservoir simulator.