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Unraveling a Carbonate System through Chrono-Previous HitStratigraphicNext Hit Horizon Tracking and Wheeler Transformation

 

McBeath, Kirstin A.1, Geert De Bruin2, Paul De Groot2 (1) University of Leeds, Leeds LS2 9JT, United Kingdom (2) dGB Earth Sciences BV, 7511 JM Enschede, Netherlands

 

This paper describes the application of a new seismic Previous HitinterpretationNext Hit technique to a green-field carbonate exploration play. The aim of the study was to assess and understand the spatial and temporal significance of potential reservoir facies within a complex carbonate system in both the time-depth and Wheeler transformed ‘flattened seismic' domain. Systems tracts Previous HitinterpretationNext Hit allowed for the prediction of potential reservoir facies distribution prior to drilling a deepwater well offshore West Africa. A three dimensional pre-stack time-migrated seismic volume of good-quality was used within the analysis and due to the largely unexplored nature of the area, no well control was available.

 

The analysis was based on classic sequence Previous HitstratigraphicNext Hit Previous HitinterpretationNext Hit principles using new seismic Previous HitinterpretationNext Hit software tools. The primary technique involved chrono-Previous HitstratigraphicNext Hit horizon tracking and Wheeler transformation. Auto-tracked chrono-Previous HitstratigraphicNext Hit surfaces (i.e. surfaces as a function of relative geological time) are generated for every seismic reflection event at sub-seismic accuracy and tracked throughout the seismic volume within the limits of conventionally mapped sequence-bounding surfaces. Through establishing such a chrono-Previous HitstratigraphicNext Hit framework, the subsequent visualization of such chrono-Previous HitstratigraphicNext Hit surfaces and corresponding ‘flattened seismic' in the Wheeler transformed domain is achieved. The depositional configuration and the presence of erosional truncations and non-depositional hiatuses are revealed in the Wheeler transformed domain, enabling detailed systems tracts Previous HitinterpretationNext Hit to be performed through specifying chrono-Previous HitstratigraphicNext Hit ranges. Synchronized visualization of the seismic volume, corresponding chrono-stratigraphy and systems tracts Previous HitinterpretationTop in both the time-depth and Wheeler transformed domain led to new insights in carbonate facies progradation, aggradation, retrogradation, erosion and non-deposition.

 

AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California