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A Geomechanics-Based Solution To Decipher Salt-Related Deformation In Lower CongoNormal access

Authors: X. Legrand and J. Shah
Event name: EAGE Conference on Reservoir Geoscience 2018
Session: Session 1: Structure, Stratigraphy & Sedimentary
Publication date: 03 December 2018
DOI: 10.3997/2214-4609.201803220
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 3.18Mb )
Price: € 20

Post-salt reservoir targets are a major focus for oil and gas exploration in passive margins with much consideration directed to lower part of Post-Rift Sequence. At reservoir scale, the entrapment structural style is closely linked to Salt which is considered as a visco-plastic layer and high variation of the paleo-topographic profile. Moreover, the quality of seismic imaging around thick and complex salt bodies is poor. Therefore, an innovative method using a geomechanics based restoration to refine the structural interpretation was proposed to decipher the complex salt-related deformation process and was used in Lower Congo Basin. The refined geological model highlights different structural styles governed by two main components that are the salt thickness and the detachment slope. The identification of gliding and spreading in gravity driven forces was demonstrated to be a good indicator to assess structural traps in otherwise complexly deformed the post-salt sediments.

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