Case Study by using Post-Stack Seismic Inversion Technique at Matrouh Basin, Western Desert, Egypt

Ahmed Ezzat Mostafa El-Midany


Jade oil field study area lies in the northern part of Matrouh basin which located in the northern of the Western Desert of Egypt which is confined between Latitudes 300 30' N and 310 00' N and Longitudes 260 25' E and 270 00' E.The study zone covers around 2000 km2. The main objectives of the present study are the following points: 1- Outlining the regional subsurface geological structures affecting on the study area and delineating their main tectonic trends. 2- Estimating the petrophysical properties of the main reservoir and, consequently the potential parts of the area for oil exploration, then evaluating the hydrocarbon potential inside the interested reservoirs (Alam El Bueib 3D, 3E, 3G and 6members), and finally 3- Locating promising plays for hydrocarbon accumulations. The available data used in the present study are: 1) Seismic data comprises (shot-point location map of the study area, twenty seismic lines, velocity measurements, in the form of sonic logs for only one well (Jade 04) 2) Well logging data for four wells distributed in the area which comprises (composite logs, formation density compensated logs, borehole compensated sonic logs, neutron logs, resistivity logs, spontaneous potential logs, gamma ray logs). To achieve these objectives the following geophysical methods were used seismic interpretation andwell logging analysis. Twenty seismic lines were interpreted by identifying of reflectors using well data (for well-to-seismic tie and well correlation), picking and correlation of reflection horizons, closing loops, detecting fault locations, constructing time structure maps and conversion of reflection times into depth structure maps. This was done by using software computer program (Petrel, 2013) developed by Schlumberger Services Company. Well logs analysis is used to evaluate the productive zones in terms of depths, thicknesses and petrophysical properties of these zones within the interested reservoirs for the evaluation of the hydrocarbon potentiality using Interactive Petrophysics (IP) developed by LR Senergy Company. The interpreted seismic sections display very well the subsurface geologic structural configuration of the study area. Petrel (2013) software was used for picking the reflection events of the interested formation tops as well as picking their dissecting faults. These formation tops are: Abo Roash 3G Member, Alamein Formation, and Zahra Member of Khatatba Formation. Close view of these seismic sections shows that the area is affected by three sets of normal faults with different heaves and throws dissecting the interested formation tops building tilted fault-blocks and horst and graben structures. Three time structure maps were constructed on the tops of these interested formations showing low and high time values that reflect the locations of structural highs and lows for the upthrown and downthrown blocks separated by different sets of normal faults arranged from old to young as follows: The first set of fault elements is the northeast-southwest (NE- SW) trending faults that are formed during the Syrian Arc System (late Cretaceous). There are two major faults resents this first set.

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Other Titles دراسة حالة باستخدام تقنية الانقلاب السيزمى بعد التجميع فى حوض مطروح - الصحراء الغربية- مصر
Issue Date 2016

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