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Jean-Christophe Navarre1, Dominique Claude2
(1) Elf Exploration Inc, Houston, TX
(2) Elf Exploration Production, Pau, France

Abstract: Impact of the stratigraphic architecture of turbiditic system on the reservoir model and the wells development plan : examples of Oligo-Miocene turbiditic system of Angola

As part of a operational integrated group project designated to use sedimentary and stratigraphically identified fluid-flow units as input for reservoir model and simulation, we have used 3D seismic interpretations calibrated on sedimentary well-logs and cores analyses to define the sedimentary architecture of turbiditic systems within the Lower Congo Tertiary Basin. Cores, well-log analyses and 3D seismic interpretations show stratigraphic cycles and changes in facies types and associations within sedimentary motif at different scale. Turbiditic system is defined between two major 3rd order stratigraphic surfaces (Submarine unconformity and/or shaly facies produced during phases of fan deactivation. Turbiditic system is composed of channel complexes limited by 4th order stratigraphic surfaces. Channel complex is formed by channel stories defined at the 5th order scale. Assemblage of channel phase (6th order scale) composes a channel story. Each channel phase is characterized by a facies association calibrated on well logs data and defined by detailed 3D seismic analyses using the Peeling Techniques of Sismage Research. This approach provides the understanding of different scale of reservoir architecture and the description of distribution, continuity and connectivity of sand/shale bodies. It is an invaluable aid in mapping fluid-flow compartments High value in the exploration/appreciation and development of turbiditic reservoirs by highlighting the risk on reservoir and heterogeneities presence and objective (deterministic) reservoir description can be made. This methodology has a direct commercial impact through erroneous reserves assessment and development planning.

AAPG Search and Discovery Article #90914©2000 AAPG Annual Convention, New Orleans, Louisiana