--> ABSTRACT: Rates of Faulting and Sedimentation in the Continental Rift Setting Constrained by Biostratigraphic, Structural and Seismic Studies - Implications for Reservoir Architecture, Dentale Formation, Gabon

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Rates of Faulting and Sedimentation in the Continental Rift Setting Constrained by Biostratigraphic, Structural and Seismic Studies - Implications for Reservoir Architecture, Dentale Formation, Gabon

Aramowicz, Aleksander 1; Ageneau, Guillaume 1; Chimienti, Pablo 1; Robinson, Adam J.1; Arnon, Boas 2
(1) ADDAX Petroleum, Geneva, Switzerland. (2) LTRO Ltd., London, United Kingdom.

The Addax - operated Obangue field in the South Gabon Basin is a sub-salt play type structure. Half of the field’s oil production comes from the late Barremian/Early Aptian Dentale formation whose structure and facies distribution have been poorly understood. The Dentale reservoir rocks are clastic, terrigenous sediments deposited in an active continental rift environment where faults provide major control on the pattern of sedimentation.

Constraints on timing and amplitude of faulting are a key input into modelling of reservoir continuity and connectivity while knowledge of geometry and thickness of discrete lithostratigraphic units have direct impact on reservoir dynamics and recoverable volume estimates.

By applying palynological and micropaleontological analysis, combined with detailed correlations and analysis of seismic reflectors, the current study aims at verifying the existence of faults and identifying their temporal (syn- versus postsedimentary) and spatial extent. The variations of biozone thickness are indicators of sedimentation rates and provide insight into the internal stratification of the Dentale formation in order to aid optimal well placement and volumetric calculations.

 

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.