Abu Roash G dolomite reservoir characterization using seismic inversion technique, Horus field, Western Desert, Egypt
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ORIGINAL PAPER
Abu Roash G dolomite reservoir characterization using seismic inversion technique, Horus field, Western Desert, Egypt Omar Mohamed Hassan Al Mahdy & Mohamed Salah Sedek
Received: 26 August 2011 / Accepted: 25 November 2011 / Published online: 30 December 2011 # Saudi Society for Geosciences 2011
Abstract The main objective of this paper was the characterization of the reservoir (Abu Roash G dolomite) in terms of acoustic impedance from surface seismic data complemented by available well logs. To reach our target, a two-step procedure was followed: first, identification of the reservoir signatures using synthetic seismogram using Strata program in Hampson–Russell software and second, applying inversion technique to the post-stack seismic data using Strata program in Hampson–Russell software to obtain acoustic impedance profiles and maps. This procedure was applied to 12 3D seismic lines (six cross-lines, and six in-lines) from Horus field in Western Desert in Egypt after converting them from analog state to SEGY format by vectorization. Five wells had been used in this study. The outcome of this paper is an improved subsurface image of seismic data and achieving the reservoir characterization in a good way. Keywords Abu Roash G dolomite . Reservoir characterization . Seismic inversion technique
Introduction
30° 41′59.9858″N) and longitude (28° 47′ 59.9739″E and 28° 53′ 59.9913″E), almost 25 km south of the Alamein Town on the Mediterranean Coast and 7 km NE from Alamein Field as shown in Fig. 1 (Egyptian General Petroleum Corporation 1992). The Horus Oil Field is located, together with several other oil fields, along the Alamein/Razzak Ridge of the north Western Desert of Egypt. This ridge comprises the main hydrocarbon play fairway in the Alamein Basin with several closed structures, which are in a favorable geological setting with respect to hydrocarbon prospectively (Vegas Oil and Gas S.A. Company 2010). Geologic setting The northern part of the Western Desert, where our field is located, forms an almost featureless plain with the exception of the small folded and faulted Abu Roach complex to the north of Giza pyramids and offers few prominent topographical or geological features that would reflect its intricate geological history (Rushdi Said 1990). Deep drilling in this desert, however, has shown that this apparently geological made by the cover of later sediments conceals beneath it an intricate geological structure made up of a large number of swells and basins (Rushdi Said 1990).
Background Structure The studied area (Horus oil field) is located in the northeast part of the Western Desert, at latitude (30° 36′0.0001″N and O. M. H. Al Mahdy (*) : M. S. Sedek Geophysics Department, Faculty of Science, Cairo University, Giza, Egypt e-mail: [email protected]
The north Western Desert structure is dominated by faults, many of these faults can be identified from seismic and well data. Its majority is steep normal faults and most have a long history of growth. Some of the normal faults suffered
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