Print this pageSuccessful Integrated Reservoir Characterisation for Determining High-Level Resolution Stratigraphic Architecture in Frade Field, Campos Basin, Brazil
Nicholas Drinkwater1, Mark Dixon2, Julian D. Clark3, and Charles Stelting1
1ETC, Chevron, Houston, TX
2Latin America Business Unit, Chevron, Rio de Janeiro, Brazil
3ETC, Chevron, San Ramon, CA
Previous studies of W.African deepwater slope valley systems have shown that they can have very complex stratigraphy, resulting in challenging reservoir architectures. Critical to successful appraisal & management of these reservoirs is detailed characterisation of the stratigraphic complexity, and creation of a robust stratigraphic framework. This presentation will show detailed characterization of wireline, image log and core data integrated with stratigraphic analysis of new seismic data from the Oligocene & Miocene slope valley systems of the Frade field, enabling architecture evaluation at a variety of different stratigraphic scales.
Image log data from Frade, calibrated to the small amount of core, were used to interpret a hierarchical nature of the reservoirs from the system, down to the smallest recognizable unit, the element. This process was then applied to legacy wells with only simple wireline log data available. These results were ground-truthed to a re-processed seismic volume to assist ongoing reservoir mapping & interpretation, and this improved construction of revised reservoir models. Having a clear architectural hierarchy resolved, we were able to assess the field development strategy & make local adjustments to planned development wells, ensuring accurate targeting.
With this framework validated by seismic data, we were able to determine points of reference to compare / contrast Frade slope valley reservoirs to other similar systems in Brazil & in West Africa, assessing stratigraphic similarities and differences within this one type of deepwater system. Succesfull integrating of these different subsurface data has lead to a clearer understanding the probability of sand distribution within this type of reservoir.
AAPG International Conference and Exhibition, Cape Town, South Africa 2008 © AAPG Search and Discovery