Integration of 2D seismic data interpretation and seismic attributes to delineate the subsurface configurations in Ras Gara area, southern Gulf of Suez, Egypt

Abstract

A grid of 2D marine seismic lines was interpreted and treated with seismic attributes to delineate the subsurface structures and disclose the hidden features. The ordinary steps of seismic reflection analysis were carried out to get meaningful images of Miocene. structures through constructing a set of two-way time structure maps for five targets. In addition, the seismic attribute enhancement procedures were implemented to best visualize salt/subsalt source structures. Both of structural and stratigraphic types of seismic attributes were applied on time migrated seismic sections to allow significant improvements in the fault detection and geometry of the strata. The results of seismic interpretation indicate presence of a salt diaper on top of South Gharib Formation, underlain by a Pre-Mio. (PM) uplift and flanked by dipping limbs to the east and west. The subsalt section is deformed by NW-SE (Clysmic) faults, which inherited from old fractures on top of basement along lines of weakness. The inner structure of the block exhibits a lack of the NE-SW-trending (cross-gulf) faults. The structural attributes highlight numerous hairline fractures of small displacements disturb the Pre-Miocene section and reduced in number at the Miocene level. The stratigraphic attributes filters succeeded to delimit lithological boundaries changes, trace salt contacts, and define “bright spots” with respect to hydrocarbon reservoirs. Generally, the dip-reversals along the diapir flanks and limbs of the PM uplift are believed to be the most potential traps.