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الرئيسية > Sedimentology and petrophysics...>الوصف

Sedimentology and petrophysics of upper Devonian F3 sandstone Wafa filed(NC-169) Ghadames basinsouth west Libya

المصدر: المجلة الجامعة
الناشر: جامعة الزاوية - مركز البحوث والدراسات العليا
المؤلف الرئيسي: Belhaj, Ans Fateh (Author)
مؤلفين آخرين: El Gheriani, Mohamed (Co-Author) , Targhi, Mohamed H. (Co-Author)
المجلد/العدد: مج23, ع3
محكمة: نعم
الدولة: ليبيا
التاريخ الميلادي: 2021
الشهر: سبتمبر
الصفحات: 167 - 190
رقم MD: 1263650
نوع المحتوى: بحوث ومقالات
اللغة: الإنجليزية
قواعد المعلومات: EduSearch, EcoLink, IslamicInfo, AraBase, HumanIndex
مواضيع:
العصر الأسماك | الطبقات الصخرية | الجيولوجيا الأرض
رابط المحتوى:

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المستخلص: Wafa field is located along the Libyan-Algerian boarder in the South- Western part of the Ghadames Basin. F3 Sandstone Frasnian age is the main producing reservoir in the study area. F3 of the Awaynat Wanin Formation of Upper Devonian was depositional units are considered as a regressive sequence responding to drop in sea level. The F3 is interpreted as localized shallow marine sandstone beds that pinch-¬out towards the north south direction with up structure towards the east and southeast of Wafa area and pass into equivalent shaly facies of F4 shale .From available data, logs and Core data, the Lithofacies descriped as sandstone body coarsening upward where, the grain size profile possibly produced by seaward progradation indicating a Barrier Island of sandstone that was possibly emerged in the manner of a barrier island which, was interpreted as discontinuous large sandstone body that thins or absent towards the southwest of the study area, the gross thickness of F3 sandstone is around 150 ft. where the upper 100 ft is a very fine to medium grained sandstone. is considered to have the best reservoir quality, where the porosity reached up to 18% and permeability up to several hundred mD. Generally across the reservoir permeability deteriorates with depth possibly passes vertically downward to lagoonal siltstones and shaly beds lacking reservoir properties. From our Petro physical evaluation, the main reservoir estimated the average volume shale is 2% in Northern part and increases towards the southern part of the study area. The average porosity is 10.5%. The average water saturation is 2.8%. Our interpretations using cross plot between Density and Neutron indicate that the lithology mainly of sandstone with minor shale. This observation probably effected the Gas/Water contact of the F3 reservoir which were not defined.

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