Delineating Karst, Fault and Fractures Interpretation Through Integration of Seismic Attributes and Diffraction Imaging in Giant Offshore Field Abu Dhabi

Abstract

Abstract Today, in a matured developed field, reservoir management is challenging due to poor seismic resolution at reservoir level. Whereas overburden geology further deteriorate seismic quality due to foot prints, observed at reservoir level. Overburden geology is a key challenge for reservoir characterization and may mislead faults and fractures interpretation, identification of rock properties and distribution of fluids. In this paper we tried to integrate both diffraction and reflection data to improve seismic resolution to delineate reservoirs and non-reservoirs zone with drilling and well data. Seismic data Seismic data was acquired using OBC technique. PreStack Time Migration processing was performed in 2002, 2016 and psdm migration was performed in 2018 for structural interpretation. However data quality for reservoir characterization was affected by the hardness of the seafloor and anomalies in the overburden. These challenges are currently being addressed through diffraction imaging. In 2022, Diffraction imaging is performed for 10×10 KM2 pilot area, due to which we were able to delineate karstic feature in detail and faults at reservoir.