3D Structural Modeling and its Impact on Hydrocarbon Reservoirs utilizing 3D Seismic Data Interpretation at West Qarun Oil Field, Northwestern Desert, Egypt.

Abstract

West Qarun Oil Field is located in Abu Gharadig basin of the north-ern Western Desert, Egypt. It lies between latitudes 29º 36' N and 29º 39' N and longitudes 29º 16' E and 29º 22' E. The main purpose of this study is to evaluate West Qarun oil field by studying the subsurface geologic structural features and the interest-ed reservoir markers (Middle, Lower Abu Roash “G” Member and Ba-hariya Formation) which are consideredthe main primary potential re-servoirs in the study field. To achieve these objectives, the current study started with the de-scription of the geological setting of the area, including the stratigraphic sequence and dominating structures through a review for the pervious geological studies.Then, 3D seismic data interpretation was carried out by using Petrel (2013) to provide detailed information about the subsurface structural geometry of West Qarun oil field. The 3D seismic interpretation step started by fault patterninterpretation through the original seismic data in order to delineate the subsurface structural features using conventional and unconventional seismic interpretation (seismic attributes) methods, then horizon interpretation process includ-ing the interested reservoirs markers. The depth structure maps which are constructed on the tops of Abu Roash "A", Middle Abu Roash “G”, Lower Abu Roash “G”, Bahariya and Alamein surfaces reveal that the West Qarun trap is an elongated NW-SE faulted anticline structural trap that constitutes over step-like fault pattern that has the same trend and downthrown towards the NE direction. Then, comprehensive quantitative petrophysical review was carried out for the available wells in study area to determine the main petro-physical parameters for the main reservoir rockslike, net pay thickness, porosity, shale content, water and hydrocarbon saturation based on a number of equations and empirical formula.The well log data analysis has been done using Interactive Petrophysics (IP, 2013) Software. Then, 3D structure model has been built through five processes (fault modeling, pillar gridding, make horizons, make zones and edit 3D grids).These processes should always be considered together and undergo several iterations to enhance the final structure model. The ob-tained 3D structure model confirms the interpreted structure from the seismic data.