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Article
Microfacies Analysis and Stratigraphic Development of the Mishrif Formation in the Eastern of the Mesopotamian Zone, Southeastern Iraq

Author: Medhat E. Nasser
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2018 Volume: 59 Issue: 4B Pages: 2053-2064
Publisher: Baghdad University جامعة بغداد

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Abstract

Mishrif Formation is the most important succession in the southern part of Iraq and has extensive distribution in the Arabian Plate. The present study focuses upon the sequence stratigraphy and development of Mishrif Formation basin in four oil fields within the eastern part of the Mesopotamian Zone are:- Halfaya (Hf-1), Noor (No-1) and Abu Ghirab (AG-3) and Fauqi oil fields (Fq-1). There are several types of microfacies were distinguished in the succession of the Mishrif Formation. Their characteristic of the grain types and carbonate texture enabled to interpret of five facies associations (depositional environments) were observed in this formation, they are: deep marine, shallow open marine, Shoal, rudist biostorm, and shallow restricted associations facies. The stratigraphic development of Mishrif succession in the studied oil fields was summarized by three depositional stages during the Cenomanian-Early Turonian cycle:- First stage:- the basin of Rumaila Formation during this stage was continued to deposition the lower part of Mishrif Formation within the deep marine environment. The end of deposition in this basin (Rumaila basin) was represented by shallow open marine associated facies in the studied area. The High stand sequence distinguished by deposition the deep marine facies and the shallow open marine as two cycle in the southwest, while to the northeast one cycle. The end of the first stage was finished by the shoal facies in all studied area to mark a sequence boundary type II (prograde stage A). Second stage:- the basin was developed from shoal to biostorm facies association with slow sea level rise. The deposition of the open marine associated facies within the biostorm-shoal sequence marked the mfs surface. The final step of this stage was shown the shallowing up-ward by overlaying the shallow open marine association facies upon the biostorm and shoal. At the end of this period, the lagoon/restricted facies were spread in the studied area to mark the prograde stage B as sequence boundary type II. Third stage:- the sea level raised in the southwest direction as open sea association facies, while to the northeast the restricted facies was dominated. This sequence appeared the shoal facies underly the open sea facies marked the mfs surface to start the final high stand deposition overly the restricted facies. This stage is representing the prograde stage C for the Mishrif Formation, where ended the deposition to mark the unconformable surface (SBI) with Khasib Formation.


Article
Facies Analysis and Geological modeling of Euphrates Formation in Ajeel Oil Field, Northern Iraq

Authors: Muhand Hassan Mahammed --- Medhat E. Nasser
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2018 Volume: 59 Issue: 4B Pages: 2065-2079
Publisher: Baghdad University جامعة بغداد

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Abstract

Abstract The current study summarized the construction of a three-dimensional geological model of the Aquitanian sediments age, which represented by the Euphrates and Serikagni formation in Ajeel Oil Field, where Ajeel Oil Field has structural closure towards northwest - southeast. Sedimentary of the current study consist of limestone, dolomitic limestone, dolomite (compose of skeletal grains, non-skeletal grains and cement) and the appearance of some anhydrite rocks. The petrographic study of the Euphrates Formation were prepared using a thin section of wells (Aj-1, Aj-4, Aj-5, Aj-6 and Aj-7), Previous studies and geological reports, as well as use well logs data in the statistical analysis by Petrel software using the Neural Network and Train Estimation Model, for divide sedimentary environments of Euphrates Formation. The petrographic analysis showed mudstone, wackstone, packstone and grainstone facies. The sedimentary environment was then determined and the sedimentary model of the current study rocks in the Ajeel field which compared with Wilson scheme where represented by zones (FZ-6, FZ-8, FZ-7) extend through lagoon environment, back shelf and open shelf, through the sedimentary model was determined the type of Euphrates Formation platform(Rimmed Platform).


Article
Thermal Maturity History and Petroleum Generation modeling for selected Oil fields Southern Iraq

Authors: Murtadha Doghiam Abdullah --- Abdullah A.AL-Yasseri --- Medhat E. Nasser
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2018 Volume: 59 Issue: 4C Pages: 2267-2278
Publisher: Baghdad University جامعة بغداد

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Abstract

The thermal maturity , burial history and petroleum generation history of four oil wells selected from four oil fields in Southern Iraq, they are: Nasiriyah(Ns-1 well) , Gharraf (GA-5well) ,Abu Ammood (Ab-1well) and Riffai (Ri-1well) have been studied using 1D basin and petroleum systems modeling. Results showed different period of subsidence, which ranges from high to moderate subsidence, occurred at upper Jurassic to Mid-Cretaceous and slow subsidence in Miocene . The porosity in the studied area represents the highest value in Dammam , Tayarat ,Um-Eradhuma and Khasib Formations. For most of the studied wells, the Paleocene to Miocene has to be regarded as times when the maximum temperature prevailed associated with deep burial could be that the age is the petroleum generation and an additional filling of traps. The organic maturation in Riffai well has entered in the main oil stage, especially Suliay and Yamama Formations whereas only Suliay Formation in GA-5 well entered in the main oil stage Therefore, there are good generated and mature source rocks in this well.


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
Petrophysical Properties and Reservoir Modeling of Mishrif Formation at Amara Oil Field, Southeast Iraq
الخصائص البتروفيزيائية والموديل المكمني لتكوين المشرف في حقل العمارة النفطي جنوب شرق العراق

Authors: Jawad K. Radhy AlBahadily جواد كاظم راضي البهادلي --- Medhat E. Nasser مدحت عليوي ناصر
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2017 Volume: 58 Issue: 3A Pages: 1262-1272
Publisher: Baghdad University جامعة بغداد

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Abstract

Petrophysical properties of Mishrif Formation at Amara oil field is determined from interpretation of open log data of (Am-1, 2 ,3 ,4 ,5 ,6 ,7 ,8 ,9 ,10 ,11 ,12 and13) wells. These properties include the total, the effected and the secondary porosity, as well as the moveable and the residual oil saturation in the invaded and uninvaded zones. According to petrophysical properties it is possible to divided Mishrif Formation which has thickness of a proximately 400 m, into seven main reservoir units (MA, MB11, MB12, MB13, MB21, MC1, MC2) . MA is divided into four secondary reservoir units , MB11 is divided into five secondary reservoir units , MB12 is divided into two secondary reservoir units , MB13 is divided into two secondary reservoir units and MB21 is divided into five secondary reservoir units. The seve units are separated by seven cap rocks (Bar1,2,3,4,5,6 and 7).A three-dimensional reservoir model is created by using (Petrel, 2014) software for all reservoir unit. The results show that the first and the second reservoir units represent important reservoir units of Mishrif Formation. Variables of thickness and reservoir properties are consider of Amara oil field.

جرى في البحث الحالي تحديد الخصائص البتروفيزيائية لتكوين المشرف في حقل العمارة من خلال تفسير بيانات المجسات البئرية لإبار الدراسة (Am-1,2,3,4,5,6,7,8,9,10,11,12 and13) والتي من خلالها جرى حساب المسامية الكلية والفعالة والثانوية والتشبعين المائي والنفطي بجزئيه القابل للحركة والمتبقي وللنطاقين المكتسح وغير المكتسح . واعتماداً على الخصائص البتروفيزيائية المحسوبة قسم تكوين المشرف في حقل العمارة الذي يترواح سمكه 400 م تقريبا الى سبعة وحدات مكمنية رئيسية MB11,MB12,MB13,MB21,MC1,MC2 ) MA,) وقسمت MA الى اربع وحدات ثانوية و MB11 الى خمس وحدات ثانوية و MB12 الى وحدتين ثانوية و MB13الى وحدتين ثانوية و MB21 الى خمس وحدات ثانوية تفصلها سبع وحدات عازلة Bar1,2,3,4,5,6,7)). جرى تمثيل المعطيات البتروفيزيائية المكمنية من خلال بناء نموذج مكمني ثلاثي الابعاد للتشبع النفطي وذلك باستخدام برنامج ( Petrel, 2014 ) لتوضيح توزيع تلك الخصائص البتروفيزيائية لكل وحدة مكمنية ضمن ابار الحقل . بينت النتائج ان افضل الوحدات المكمنية هي الوحدة المكمنية MA و الوحدة المكمنية MB11 اخذين بنظر الاعتبار تغاير سماكة تلك الوحدات واتجاه زيادتها ونقصانها .


Article
Microfacies Evaluation of Mauddud Formation in Ratawi Field, South Iraq
تقييم السحنات الدقيقة لتكوين المودود في حقل رطاوي، جنوب العراق

Authors: Redha H. Nasser رضا حبيب نصر --- Medhat E. Nasser مدحت عليوي ناصر
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2017 Volume: 58 Issue: 4A Pages: 1918-1932
Publisher: Baghdad University جامعة بغداد

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Abstract

This paper includes studying the microfacies evalution of Mauddud Formaion in four wells(Rt-2, Rt-5, Rt17 and Rt-19). Seventy-seven(77) sampels were collected of above mentioned wells. Based on fossil content of the samples under study, four main microfacies were identified: packstone , wakestone , grainstone and lime mudstone microfacies ,which deposited in shallow open marine and restricted marine environments. Petrographic examination of thin section indicated that diagenesis vary in intensity from one site to another, such as dissolution, cementation, compaction, dolomitization and micritization, which led to the improvement and deterioration of porosity. The dominant pore types are vuggy, interparticle and intercrystal.The lithology, mineralogy and the matrix were determined by using crossplot method, which showed that the predominant lithology of the formation is limestone with the presence of dolomite in very few percentages and the mineralogy is calcite. Based on the relationship between porosity and permeability the resevoir performance of the microfacies classified into four types: bad, fair, good and very good. Based on petrophysical properties and core description of well study Mauddud Formation was divided into four rock units A,B,C and D , in terms of reservoir, units A and C are considered good ,while B and D are bad.

يشتمل هذا البحث على تقيم السحنات الدقيقة لتكوين المودود في اربعة ابارلحقل الرطاوي(Rt-2, Rt-5, Rt-17, Rt19). تم جمع سبع وسبعون نموذجا للابار المذكوره اعلاه. اعتمادا على المحتوى الاحيائي للنماذج قيد الدراسة تم تشخيص اربعة سحنات رئيسة هي سحنة الحجر الجير المرصوص وسحنة الحجر الجيري الواكي وسحنة الحجر الجيري الحبيبي وسحنة الحجر الجيري الطيني والتي ترسبت في بيئات بحرية ضحلة مفتوحة ومحصورة .ومن خلال فحص الشرائح الرقيقة تبين وجودعمليات تحويرية تتغاير في شدتها من موقع الى اخرى مثل الاذابة والسمنته والاحكام والدلمته والمكرته التي أدت الى تحسن وتدهور المسامية. المسامية السائده هي بين الحببيات وبين البلورات . تم تحديد الصخارية والمعدنية والملاط باستخدام مرتسامات التقاطع التي بينت ان الصخارية السائدة للتكوين هو الحجر الجيري مع وجود دولومايت بنسب قليلة جدا والمعدنية هي الكلسايت. اعتمادا على العلاقة بين المسامية والنفاذية صنفت ادائية السحنات المكمنية الى اربعة انواع هي ردئية ومتوسطة وجيده وجيدة جدا. وإعتمادا على الصفات البتروفيزيائية ووصف اللباب لآبار الدراسة تم تقسيم تكوين المودود الى أربعة وحدات صخارية هي Aو B و C و D , تعتبر الوحدتين A و C وحدتين مكمنيتين جيدتين , بينما الوحدتان B و D تعتبران وحدتان رديئتان مكمنيا.


Article
Geological Modeling for Yamama Formation in Abu Amood Oil Field
موديل جيولوجي لتكوين اليمامة في حقل ابو عمود النفطي

Authors: Medhat E. Nasser مشتاق فلاح حسن --- Sameer N. Al-Jawed سمير نوري الجواد --- Mushtak F. Hassan مدحت عليوي ناصر
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2017 Volume: 58 Issue: 2C Pages: 1051-1068
Publisher: Baghdad University جامعة بغداد

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Abstract

3D geological model of a simple petroleum reservoir for Yamama Formation has been built in Abu Amood Oil Field using Petrel software, which is a product of Schlumberger. This model contains the structure, stratigraphy and reservoir properties (porosity and water saturation) in three directions(X, Y and Z).Geologic modeling is an applied science of creating computerized representations of portions of the earth's crust, especially oil and gas fields. Yamama Formation in Abu Amood Oil Field is divided into thirteen zones by using well logs and their petrophysical properties, six of which are reservoir zones. From the top of the formation these six zones are: (YB-1, YB-2, YB-3, YC-1, YC-2 and YC-3). These reservoir zones are separated from each other by barriers, which are of little or no porosity.

تم بناء موديل جيولوجي بسيط لتكوين اليمامة في حقل ابو عامود النفطي بأستخدام برنامج البترل الذي قدمته شركة شلمبرجر النفطية. يشمل هذا الموديل الصفات التركيبية والبيئية والمكمنية المتمثلة بالمسامية والتشبع المائي في ثلاث ابعاد على المحاور الثلاث (Y,XوZ) حيث يعتبر هذا الموديل علم تطبيقي في عمل تمثيل حاسوبي لاجزاء من القشرة الارضية, ولا سيما في حقول النفط والغاز. قُسِم تكوين اليمامة في حقل ابو عامود النفطي الى ثلاثة عشر نطاقاً بأستخدام المجسات البئرية وصفاتها البتروفيزيائية, ستة من هذه الانطقة تعتبر وحدات مكمنية من اعلى التكوين هذه الوحدات هي ( YB-1, YB-2, YB-3, YC-1, YC-2 و YC-3) وهذه الوحدات المكمنية معزولة عن بعضها البعض بطبقات عازلة مع مسامية قليلة او معدومة.

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