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العنوان
Reservoir characterization and formation evaluation of some jurrasic/ cretaceous reservoirs in salam oil Field, shushan basin, north western desert, Egypt /
المؤلف
Shalaby, Aya Yasser Gaffar.
هيئة الاعداد
باحث / آية ياسر جعفر شلبي
مشرف / أحمد السيد المحمودي
مشرف / محمود لطفي ليلة
مشرف / محمد أحمد البسطاويسي
مناقش / محمد احمد فؤاد العراقي
مناقش / محمد احمد عمران وادي
الموضوع
Cretaceous-Paleogene boundary. Geology, Stratigraphic. Geology - Methodology. Geology, Stratigraphic - Cretaceous. Paleontology - Cretaceous. Geology.
تاريخ النشر
2021.
عدد الصفحات
online resource (131 pages) :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
علوم الأرض والكواكب
تاريخ الإجازة
01/01/2021
مكان الإجازة
جامعة المنصورة - كلية العلوم - قسم الجيولوجيا
الفهرس
Only 14 pages are availabe for public view

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from 131

Abstract

Shushan basin is one of the most plentiful basin in the north Western Desert of Egypt. It is a rift basin that initiated in response to opening of Neo-Tethys ocean that was generated by the divergence between North African plate and European plate. Extensional and strike-slip structures are considered as the most important features that affected the distribution and thickness of the Jurassic and cretaceous oil bearing sequences. The available data in this study include twenty 2D reflection seismic sections, composite log of four wells (Salam-02, Salam-04, Salam-05 and Salam-08), and in addition conventional core data from two wells (Salam-04 and Salam-05). Regarding to Khatatba formation, from core and facies analysis, nine facies association were recognized and their stacking patterns is highly governed by the rift evolution and interplay between variation in fault offsets and sediment supply. Distal sand bar sandstones, marine shales and organic-rich shales were accumulated during periods of high subsidence. Successive alternation between shallow and deep facies at the base of the lower unit reveals repeated short periods of progradation and retrogradation with overall progradational trend typifying a higher rate of sedimentation and sediment supply. Episodic fault-controlled retrograding and prograding continued during the deposition of the Khatatba upper unit where the progradational deltaic facies changes upward into retrogradational marine facies that are followed by aggradational-progradational Aeolian and shoreface sandstones. Five hydraulic flow units (HFUs) were identified and their distribution is mostly controlled by rift evolution. The best reservoir quality is associated with the prograding deltaic facies, while the lowest reservoir quality is associated to the retrograding distal facies. According to Bahariya Formation, Lower Bahariya reservoirs consist mainly of fluvial dominated braided channel and fluvial floodplain facies. Whereas, upper Bahariya facies deposited under tidally- influenced shallow marine condition. Eight hydraulic flow units (HFUs) were identified. Flow zones distribution is mainly controlled by the degree of petrophysical heterogeneity. Lower Bahariya reservoirs with a lower degree of heterogeneity have a greater number of speed zones, while the highly heterogeneous Upper Bahariya reservoir has its great thickness of baffle zone. At megascale, the speed, baffle and barrier zones in the lower and upper Bahariya formation are laterally well correlated and thus display minimal magnitude of megascopic heterogeneity.