[First Hit]

AAPG Africa Region, The Eastern Mediterranean Mega-Basin: New Data, New Ideas and New Opportunities

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Application of Structural Seismic Previous HitAttributesNext Hit for “Polygonal Faults” Interpretation in Unconventional Carbonate Reservoir

Abstract

Seismic Previous HitattributesNext Hit are specific functions derived from seismic data, to enhance the appearance of different geologic features along the main seismic reflectors in both cross-section and map views. In this work we applied volume seismic Previous HitattributesNext Hit in order to enhance the appearance of the polygonal faults located at the Abu El-Gharadig basin, North of Western Desert, Egypt. The main objective is to illuminate the small or sub-seismic faults to determine its implication on the unconventional carbonate reservoir, of the Middle Eocene Apollonia Formation. The workflow started by the application of the structural Previous HitsmoothingNext Hit attribute on a 3D post-stack, depth migrated seismic volume, in order to highlight the discontinuities of the seismic reflectors along the seismic sections. This is followed by the calculation of two main Previous HitattributesNext Hit, seismic coherence and curvature Previous HitattributesNext Hit. The most positive and most negative curvature Previous HitattributesNext Hit allowed us to identify small faults that are below seismic resolution. We found that the curvature Previous HitattributesNext Hit delineate faults distribution in our area of study better than other Previous HitattributesTop. The presence of these faults had been verified by the geosteering technique applied during the drilling of one of the horizontal wells in the field. As a result, this study can potentially enhance the quality interpretation of seismic data and better identification of the major and minor faults that have an important implication on the fluid flow characterization of the reservoir.