research centers


Search results: Found 6

Listing 1 - 6 of 6
Sort by

Article
Using Elastic Properties as a Predictive Tool to Identify Pore-Fluid Type in Carbonate Formations
إستخدام الخواص المرنة للصخور كأداة تنبؤية لنوع المائع في مسامات الصخور الكاربونية

Authors: Mahmoud Jasim Al-Khafaji --- Wafaa’ Mustafa Al-Kattan
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2019 Volume: 20 Issue: 1 Pages: 53-64
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

The aim of this study is for testing the applicability of Ramamoorthy and Murphy method for identification of predominant pore fluid type, in Middle Eastern carbonate reservoir, by analyzing the dynamic elastic properties derived from the sonic log. and involving the results of Souder, for testing the same method in chalk reservoir in the North Sea region. Mishrif formation in Garraf oilfield in southern Iraq was handled in this study, utilizing a slightly-deviated well data, these data include open-hole full-set logs, where, the sonic log composed of shear and compression modes, and geologic description to check the results. The Geolog software is used to make the conventional interpretation of porosity, lithology, and saturation. Also, include PVT and water analyses as inputs in Batzle and Wang correlations in order to calculate mechanical properties of oil and water at reservoir conditions. The shear velocity and density logs are used to calculate the shear modulus (G), for each (0.1254) meter. The dry frame bulk modulus correlation of the original method was not followed, instead, a new dry frame bulk modulus correlation of Saxena is used to avoid the uncertainty in the porosity type exist in the formation which needs special core description. Then, Gassmann’s equations were used to determine the bulk moduli of the rock assuming two saturation conditions; the first is 100% water saturated, and the second is 100% oil saturated. Using elastic properties equations of Love’s, and the resulted bulk moduli, two corresponding ∆t(s), (for oil and for water), were computed for each depth level. Then these ∆t(s) were plotted with sonic ∆t in the same track, and compiled with the conventional log interpretation, to compare the results. The method was a good indicator of the fluid type in the high porosity zones, unlike for the tight or clay-rich zones. The results are very conformable to the conventional interpretation, the OWC in both model and conventional interpretation are so close with error percentage of (0.03%).

إنَّ الهدف من هذه الدراسة، هو لفحص تطبيق طريقة تبؤية لنوع المائع المسامي المنشورة من قبل رامامورثي ومورفي، لإحدى تكوينات الشرق الأوسط الكاربونية. وكذلك تضمنت إستخدام نتائج ساودر الذي إستخدم مبدأ رامامورثي-مورفي في توقع نوع المائع المسامي في صخور بحر الشمال الطبشورية. ولقد تناولت هذه الدراسة تكوين المشرف في حقل الغراف الواقع في جنوب العراق، من خلال بئر شبه عمودي محفور إلى تكوين المشرف. وقد إستخدمت بيانات المجسات في التكوين المفتوح وخصوصا المجس الصوتي ذو الطورين (القصي والإنضغاطي) وبيانات الوصف الجيولوجية وبيانات الفحوصات المختبرية للسوائل المكمنية (PVT) لغرض إشتقاق الخواص المرنة لهذه الموائع بإستخدام معادلات باتزل ووانغ. تم إستخدام مجس الكثافة و قياسات سرعة القص لإشتقاق معامل القص للصخرة لكل (0.1254 متر) على طول التجويف. أما معامل الإنضغاطية للصخرة الجافة فقد تم إشتقاقه من معادلة ساكسينا، بدلا عن المعادلات المتبعة في الدراستين السابقتين بسبب الحاجة إلى دراسة تفصيلية للباب لغرض معرفة نوع المسامية. تم إستخدام معادلة غاسمان لحساب معامل الإنضغاطية الكلي للصخرة بظروف تشبع مختلفة (100% ماء) و(100% نفط)، وتم ربطها بمعادلات لوف لإشتقاق قيمة زمن الإنتقال الأنضغاطي (مقلوب السرعة) بإستخدام المعاملات الناتجة من معادلة غاسمان. بعد ذلك تم دمج المنحنيات الناتجة مع منحنى المجس الصوتي الإنضغاطي وكذلك مع تفسير التجويف المفتوح من مسامية وتشبع وصخارية. وقد بينت الدراسة إن الطريقة هي دليل جيد على نوع المائع المسامي، وخصوصا في مناطق المسامية الجيده. وبعكسه في المناطق القليلة النفاذية فهي غير مفيده. وقد كانت النتائج متوافقة بشكل ممتاز مع التفسيرات الأخرى، فقد أعطت عمق تماس النفط-الماء بشكل ممتاز ومشابه للعمق الناتج من منحنى التشبع الناتج من المقاومة النوعية العميقة، بهامش خطأ اقل من (0.03%).


Article
Microfacies analysis and petrographic study of the Mishrif Formation, in selected wells from southeastern of Iraq.

Author: Dr. Afrah H. Saleh د. افراح حسن صالح
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2019 Issue: 22 Pages: E81-E94
Publisher: Ministry of Oil وزارة النفط

Loading...
Loading...
Abstract

Mishrif carbonates formation, is a major reservoir in southeast of Iraq and is one of the principle carbonate reservoir in central and southern Iraq, which is of Late Cenomanian to Early Turronian. A petrographic and depositional Environment study has been carried out by examining available thin sections in the Ministry of Oil for wells (No-1, No-2 (Noor field), Am-1(Amara field) and Hf-1 (Halfaya field)). The main skeletal grains of the Mishrif formation include coral, Rudist, large and small benthonic Foraminifera & planktonic Foraminifera (Planktonic Foraminifera are common in the lower part of the Mishrif Formation), ostracods, echinoderms, and molluscs. The Rudist were found in small to large fragments; and as a complete fossil covering the whole thin section. The Non-skeletal grains included peloids, and micrite. The most important diagenetic processes affecting on the Mishrif Formation are dolomitization, dissolution, cementation, micritization, recrystallization and Stylolite.Mishrif succession comprises six paleoenvironments which are deep marine, shallow open marine, rudist biostrome, shoal, back shoal, and lagoon.


Article
The Role of Chemistry of the Oil-Field Water in the Distribution of Reservoir Pressures: A Case Study of Mishrif Reservoir in the Southern Oil-Fields, Iraq

Loading...
Loading...
Abstract

Mishrif Formation is the main reservoir in oil-fields (North Rumaila, South Rumaila, Majnoon, Zubair and West Qurna) which located at Basrah southern Iraq. The Inductively coupled plasma-Mass spectrometer (ICP-MS) was used for the water chemistry analysis and Scanning Electron Microprobe (SEM) for the purpose of mineralogy diagnosis. A weak acidic water of salinity six-time greater than seawater plays a role in generating the formation pressure and controlling the fluid flow. The potentiometric subsurface maps were modeled and the direction of super-pressure sites that are of a great importance in the oil exploration were marked to pay attention during future drilling.


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

Loading...
Loading...
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
STUDY OF PETROPHYSICAL PROPERTIES OF MISHRIF AND YAMAMA FORMATIONS AT SELECTED FIELDS, SOUTH IRAQ

Authors: AMNA M. HANDHAL --- HUSSEIN A. CHAFEET --- NAWFAL A. DAHHAM --- RAGHAD BASHER
Journal: Journal of Basrah Researches (Sciences) مجلة ابحاث البصرة ( العلميات) ISSN: 18172695 Year: 2019 Volume: 45 Issue: 2A Pages: 131-161
Publisher: Basrah University جامعة البصرة

Loading...
Loading...
Abstract

The characteristics of reservoir require reliable knowledge of certain fundamental reservoir properties. Log measurements can define or at least infer these properties: resistivity, porosity, shale volume, lithology, water saturation, hydrocarbon saturation and permeability. The current study represents evaluation of petrophysical properties in wells Fa-1, Fa-2 and Fa-3 in Faiha oilfield and in well Snd-2 in Sindibad oilfield of Mishrif and Yamama formations, southern Iraq.The petrophysical evaluation was based on well logs data to delineate the reservoir characteristics of Mishrif and Yamama formations. The available well logs such as (Gamma ray, SP, Resistivity (MSF, ILL), Sonic, Density and Neutron logs) are digitized using Didger software (v.4). The environmental corrections and petrophysical parameters such as porosity, water saturation, hydrocarbon saturation and shale volume were computed and interpreted using Interactive Petrophysics software (IP). Petrophysical properties were determined and plotted as computer processing interpretation (CPI) using Interactive Petrophysics software. Lithological study of Mishrif Formation appears that it consists mainly of interbedded limestone, dolomite and shale, whereas lithological study of Yamama Formation appears that it consists mainly of interbedded limestone, dolomite and shale in some depths.Interpretations of well logs of Mishrif Formation in well Snd-2 it have good hydrocarbon saturation. Results also referred that hydrocarbon saturation and permeability in some ranges of the formation especially in MB unit is very high, in addition to the low movable oil and this may indication of the heavy oil in the formation. While interpretations of well logs of Yamama Formation in well Fa-1 indicated high hydrocarbon saturation. In general, the reservoir characteristics of Yamama Formation in Fa-1 are better than wells Fa-2 and Snd-2, and reservoir characteristics of Mishrif Formation in well Snd-2 better than Fa-1 and Fa-3 according to petrophysical properties and hydrocarbon saturation. Mishrif Formation in Faiha oilfield is divided into nine zones and nine zones in Sindibad oilfield, while Yamama Formation is divided into six zones in Faiha oilfield and seven zones in Sindibad oilfield according to Behavior of well logs and Shale volume.


Article
Structural geology and petrophysics analysis to Injection wells of Mishrif Formation in Shuaiba Dome – Zubair Oil Field
تحليل الجيولوجيا التركيبية والبتروفيزياء لأبار حـقن تكـوين المشــرف – قبة الشعيبــة في حقل الزبــيـر

Authors: Hussain Sakban Dawood حسين صكبان داود --- Aymen Adil Lazim ايمن عادل لازم
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2019 Issue: 24 Pages: E59-E74
Publisher: Ministry of Oil وزارة النفط

Loading...
Loading...
Abstract

Mishrif formation is the one of the most important reservoir in Southern – Iraq and the injection water important to support the reservoir pressure. The current study combined the interpretations of PLT, structural geology and petro-physics to understand the distribution of the injection rate for nine injection wells to the Mishrif Formation in Shuaiba Dome (or culmination) - Zubair Oil Field. PLT analysis calculated injection rate for Mishrif Formation, structural analysis included geometric and genetic analysis, whereas petrophysics analysis used open hole logs interpretation and core data for the injection wells to determine the petro-physics characteristics (especially the distribution of porosity and permeability). The current study concluded that the injection rate, porosity and permeability of Mishrif Formation distributed unequally across it. This variation is almost regular, whereas the Upper Mishrif more than Lower Mishrif, while Middle Mishrif get the least value. The thickness of Lower Mishrif more than Upper Mishrif. This may affected by a folding mechanism due to tectonic activity (reactivated basement faults and Hormuz salt structures).

يعتبر تكوين المشرف من اهم المكامن النفطية لحقل الزبيــر - جنوبي العراق، حيث تستخدم تقنية حقن المياه لدعم الضغط المكمني فيه لغرض زيادة الأنتاج. ربطت الدراسة الحالية بين نتائج تفاسير تحليلات الجيولوجيا التركيبية، والبتروفيزياء، ومجسات فحص الأنتاج لفهم توزيع كمية الحقن لـ 9 ابار ضمن قبة (او ذروة) الشعيبة وعلاقتها بالصورة التركيبية والصفات البتروفيزيائية لتكوين المشرف في قبة الشعيبة في حقل الزبير. تضمن التحليل التركيبي كلا من التحليل الهندسي والتحليل المنشأي، بينما استخدم التحليل البتروفيزيائي مجسات الأبار المفتوحه وبيانات اللباب لتحديد المواصفات البتروفيزيائية (بالأخص توزيع المسامية والنفاذية)، وتم تحديد نسب كمية المياه المحقونة في طبقات تكوين المشرف بواسطة مجسات الأنتاج. استنتجت الدراسة الحالية بأن سماكة طبقة المشرف الأسفل اكبر من سماكة طبقة المشرف الأعلى وربما يعزى ذلك الى دور ميكانيكة الطي بالثني، والتي ربما جائت نتيجة لدور القوى التكتونية المسؤولة عن تشكل قبة الشعيبة في حقل الزبير وهي: اعادة تنشيط فوالق القاعده ودور املاح هرمز. وبالتالي فأن توزيع كلاً من المسامية والنفاذية ونسب حقن المياه توزعت بصورة غير متساوية حول تكوين المشرف. وان هذا الأختلاف او التغايير (للمسامية والنفاذية ونسب الحقن) متوزع بصورة منتظمة، بحيث ان المشرف الأعلى يمتلك القيم الأعلى قياسا بالمشرف الأسفل، بينما اقل القيم تكون للمشرف الأوسط.

Listing 1 - 6 of 6
Sort by
Narrow your search

Resource type

article (6)


Language

English (6)


Year
From To Submit

2019 (6)