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Article
Building a 3D Petrophysical Model for Mishrif Formation in Nasiriyah Oil Field, Southern Iraq

Authors: Murtadha Doghiam Abdullah --- Medhat E. Nasser --- Abdullah A.AL-Yasseri
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2019 Volume: 60 Issue: 1 Pages: 115-126
Publisher: Baghdad University جامعة بغداد

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Abstract

A 3D geological model for Mishrif Reservoir in Nasiriyah oil field had beeninvented "designed" "built". Twenty Five wells namely have been selected lying inNasiriyah Governorate in order to build Structural and petrophysical (porosity andwater saturation) models represented by a 3D static geological model in threedirections .Structural model showed that Nasiriyah oil field represents anticlinal foldits length about 30 km and the width about 10 km, its axis extends toward NW–SEwith structural closure about 65 km . After making zones for Mishrif reservoir,which was divided into 5 zones i.e. (MA zone, UmB 1zone,MmB1 zone ,L.mB1zone and mB2zone) .Layers were built for each zone depending on petrophysicalproperties. MA(1 layer) ,UmB1(6 layer) ,MmB1 (8 layer) LmB1(6 layer) andmB2(5 layer) Petrophysical models (porosity and water saturation) had beenconstructed for each zone of Mishrif reservoir using random function simulationalgorithm. According to data analyses and the results from modelling, the MB1zoneis a good reservoir unit regarding its good petrophysical properties (high porosityand low water saturation) with high presence of oil in economic quantities


Article
Building a 3D Petrophysical Model for Mishrif Formation in Nasiriyah Oil Field, Southern Iraq

Authors: Murtadha Doghiam Abdullah --- Medhat E. Nasser --- Abdullah A.AL-Yasseri
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2019 Volume: 60 Issue: 1 Pages: 115-126
Publisher: Baghdad University جامعة بغداد

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Abstract

A 3D geological model for Mishrif Reservoir in Nasiriyah oil field had beeninvented "designed" "built". Twenty Five wells namely have been selected lying inNasiriyah Governorate in order to build Structural and petrophysical (porosity andwater saturation) models represented by a 3D static geological model in threedirections .Structural model showed that Nasiriyah oil field represents anticlinal foldits length about 30 km and the width about 10 km, its axis extends toward NW–SEwith structural closure about 65 km . After making zones for Mishrif reservoir,which was divided into 5 zones i.e. (MA zone, UmB 1zone,MmB1 zone ,L.mB1zone and mB2zone) .Layers were built for each zone depending on petrophysicalproperties. MA(1 layer) ,UmB1(6 layer) ,MmB1 (8 layer) LmB1(6 layer) andmB2(5 layer) Petrophysical models (porosity and water saturation) had beenconstructed for each zone of Mishrif reservoir using random function simulationalgorithm. According to data analyses and the results from modelling, the MB1zoneis a good reservoir unit regarding its good petrophysical properties (high porosityand low water saturation) with high presence of oil in economic quantities


Article
Evaluation of Petrophysical Characteristics of Carbonate Mishrif Reservoir in Ahdeb oil Field, Central Iraq

Authors: Madhat E. Nasser --- Buraq Adnan Al-Baldawi
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2019 Volume: 60 Issue: 2 Pages: 321-329
Publisher: Baghdad University جامعة بغداد

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Abstract

Ahdeb oil field is located in the central block of Mesopotamia plain in Iraq. It has three domes AD-1, AD-2, and AD-4.The current study represents characterization of carbonate Mishrif reservoir (Cenomanian-Early Turonian) in three wells (AD-A,AD-B,AD-C) at southern dome of Ahdeb oil field. Petrophysical properties were calculated using available well logs data such as neutron, density, sonic, gamma ray, resistivity and self-potential logs. These logs are digitized and then environmental corrections and interpretations were carried out using Techlog software. Petrophysical parameters such as shale volume, porosity, water saturation, hydrocarbon saturation, bulk water volume, etc. were determined and interpreted and illustrated in computer processing interpretation (CPI).Mishrif Formation was divided into five units according to reservoir properties (MI-1,MI-2,MI-3,MI-4 and MI-5). These units differ from each other’s by reservoir properties. The unit MI-4 is the best reservoir unit in Mishrif Formation that has good petrophysical properties such as high porosity and low water saturation. The MI-4 unit represents the principle oil bearing unit in Mishrif Formation.The other units of Mishrif Formation are characterized by high water saturation with variations of effective porosity that indicated of these units are free oil shows.


Article
EVALUATION OF THE PILA SPI FORMATION CARBONATE ROCKS FOR DIMENSION STONE, QARA DAGH AREA, KURDISTAN REGION, NE IRAQ
تقييم صخور تكوين البلاسبي كحجر تغليف، منطقة قره داغ، اقليم كوردستان، شمال شرق العراق

Authors: Tola A. Mirza توڵە احمد میرزا --- Saman Gh. Rashid سامان غریب رشيد
Journal: Iraqi Bulletin of Geology and Mining مجلة الجيولوجيا والتعدين العراقية ISSN: 18114539 Year: 2019 Volume: 15 Issue: 2 Pages: 107-120
Publisher: Ministry of Industry and Minerals وزارة الصناعة والمعادن

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Abstract

The Kurdistan Region has an enormous number of different carbonate rock units, which vary widely in their geological age and sedimentary depositional environment. Limestone quarried from the exposures has a wide range of usages and applications, such as dimension stone, crushed stone, building stone and paving stones. Since antiquity, limestone was used as building materials in areas where they were naturally available and abundant. Little work has been done to indicate the physical and mechanical properties of the limestone, especially under humid environment. In this study, the physical and mechanical properties of some carbonate rocks of the Pila Spi Formation (Eocene) are investigated. samples are collected from the Pila Spi Formation in the Qara Dagh area at two sites close to each other to assess their suitability for use as dimension stone. Geological, petrographical, geochemical and geotechnical properties of the carbonate rocks in the study area are determined based on field studies and laboratory tests. The field studies indicate that the carbonate rocks of the Pila Spi Formation in the studied area are mostly well-bedded to massive, crystalline, white in color, sometimes become chalky towards the top with small oxidation signs on the surface. Petrographical study reveal that the carbonate rocks are characterized as dolomitic limestone and have a grayish and yellowish-white color after polishing. The carbonate rocks are mostly dolomites or recrystallized dolomitic limestone. Geochemical analyses of the studied samples show that CaO and MgO are the most abundant oxides and the rocks can be classified as impure limestones. According to the American Standard for Testing and Materials, ASTM C568-03 (2006) the carbonate rocks in the studied sites are acceptable for use as dimension stone.

يحتوي اقليم كوردستان على كميات كبيرة وأنواع مختلفة من الوحدات الصخرية الكلسيةالتي تختلف باعمارها وبيئاتها الرسوبية. لقد استخرج الحجر الجيري من مقالع مختلفة لمختلف الاستعمالات والاستخدامات مثل حجر التغليف, كسارة الحجر، حجر بناء واحجار اكساء الطرق، وكما هو معتاد منذ القدم كمواد أوليه للبناء لوفرتة في الطبيعية وسهولة الحصول عليه.تعد الدراسات التي تتناول الخصائص الفيزيائية والميكانيكيه للحجر الكلسي وخاصة في المناطق الرطبة قليلة، تتناول الدراسة الحالية دراسة هذه الخصائص لصخور تكوين البلاسبي (الايوسين). تم اجراء الدراسات الحقلية وجمع النماذج لمكاشف تكوين البلاسبي في موقعين متقاربين في منطقة قره داغ وذلك لتقييم صلاحيتها للاستعمال كحجر تغليف لواجهات المباني. لقد تم تحديد الخصائص الجيولوجية والبيتروغرافية والجيوكيميائية والجيوتكنيكية للصخور المدروسة من خلال الدراسات الحقلية والمختبرية. تشيرالدراسات الحقلية لهذه الصخور الى انها صخور بيضاء كتلية الى منتظمة التطبق، بلوريه تتحول نحو الاعلى الى صخور طباشيريه مع بعض علامات الاكسدة السطحية. تبين الدراسة البيتروغرافية ان هذه الصخور كلسية – دولوميتية وتتصف بلون ابيض رصاصي او ابيض مصفر عند صقلها، وهي في الغالب اما حجردولوميتي او حجر كلسي – دولوميتي معاد التبلور. اما التحليل الجيوكيميائي فقد بين ان غالبية الاكاسيد تتكون من CaO وMgO وتصنف الصخور على انها حجر جيري غير نقي. بموجب المواصفة الامريكية للفحص والمواد ASTM C568-03 (2006) فان الصخور الكاربونيتية المدروسة صالحة للاستخدام كحجر تغليف للمباني.

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