Seismic Characteristics, Identification and Comparison of Strike Slip Fault Systems in Onshore/Shallow Marine Fields in Abu Dhabi, UAE

Abstract

In Abu Dhabi fields, strike slip faults can be originated from deep seated basement and/or reactivated salt related faults in a wrench tectonic regime. This paper outlines the identification of strike slip faults using 3D seismic imaging and describes the characteristics, orientations, spacing of the fault zones and the characterization of fault corridors through horizontal wells. Finally comparing similarities and contrast in the faults systems between different fields at the seismic scale. The structural development and deformation mechanics associated with the Late Cretaceous tectonic phase represent the key factors of hydrocarbon accumulation in Abu Dhabi, where strike slip fault system that forms structural traps with several discoveries have been made. 3D seismic analysis has been performed on multiple 3D seismic cubes, and structure sensitive seismic attributes at different stratigraphic levels has been derived to better understand structural characterization and the geometry of Strike Slip systems. The main NW-SE fault system consists of a complex series of sub-parallel faults that connect via transfers, relay ramps or accommodation zones. Seismic images shows that these zones are associated with micro faults, fractures and folded closures resulting from the development of positive and negative flower structure. These deep-seated faulting generally drives strike-slip tectonics happened when basement faults are reactivated a zone of rotational bulk strain develops in the overburden. The strain is accommodated by a variety of en-échelon structures including Riedel shears, normal and thrusts faults and folds. However, in deep seated detached salt related tectonics, a symmetric, conjugate pair of strike-slip faults will develop accommodating rotational bulk strain