ROCK PHYSICS AS A TOOL FOR INTERPRETATION RISK REDUCTION AND RESERVOIR CHARACTERIZATION, TERTIARY SYSTEM, NORTH EL AMRIYA, OFFSHORE NILE DELTA, EGYPT

Abstract

The region of Nile Delta deep water is rapidly emerging as a major gas province. The area of the study covered an area of about 1200 Km2 which is part of North El-Amriya area in the western part of the offshore Nile Delta. The key reservoirs in the study area are related to the Neogene time i.e. Miocene and Pliocene sequences. Seven wells were selected to be used in the thesis study, they are namely; A, B, C, D, E, F and El King-1X, they include complete well data in addition to two 3D seismic surveys (NEA-West and NEA-NA ). From the seismic data acquisition and processing perspective, the objective was to apply advanced seismic data processing techniques aimed to get amplitude preservation seismic data. The study motivations is mainly to explain the reasons behind the negative results of three dry holes, one of them along the Pliocene which is Well-F and the other two are Messinian wells (Well-A and Well-B). Although they are, in term of amplitude responses, they are quite similar to the other nearby successful wells. This required to check the possible reasons for the change in amplitude in the study area, which can be accomplished by building updated rock physics models, investigating the sensitivity of the elastic properties and by suggesting different kind of qualitative and quantitative seismic interpretation workflows for get a robust reservoir characterization results which can be used to decrease the associated geological risks in any upcoming exploration programs. Synthetic seismograms generated in the seven wells using statistical wavelet with fair to good match and in later stage, the wavelet extraction from the seismic using the deterministic approach was done to get better wells to seismic match.