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Article
Improved Sand characterization of Mafe Field of Niger Delta by integrated well logs information and 3D seismic data

Authors: Okpogo Emele Uduma --- Atueyi Ifeyinwa Obiageli --- Abbey Chukwuemeka Patrick
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2018 Volume: 59 Issue: 2C Pages: 1065-1073
Publisher: Baghdad University جامعة بغداد

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Abstract

Well log rock physics and seismic facies analysis was carried out with a view to enhancing reservoir sand characterization of Mafe Field of Niger Delta. Lithofacies were identified using suites of well logs and correlated across the block. Rock properties were estimated from wireline logs using empirical methods. Vp-porosity crossplot was used to characterize the delineated sandstone reservoirs by comparing observed clusters and trends with various rock physics models. Seismic attribute analysis was employed to detect lateral changes in lithology across the field. Reservoir A is a relatively clean sand, with low average volume of shale of 0.4, average thickness of 55m, good average porosity of 0.26 and average water saturation of 0.45. Reservoir B is also a relatively clean sand with low average volume of shale of 0.35, average thickness of 85m, high average porosity of 0.27 and average water saturation of 0.54. Reservoir C has an estimated volume of shale of 0.21 average total porosity of 0.23, and an average thickness of 70m with average water saturation of 0.65. Reservoir A conforms to the friable sand model while Vp-porosity crossplot cluster trend for both reservoir B and C show trend and properties imitating the contact cement model. The time slices extracted at different time intervals from the envelope and instantaneous frequency cubes show lateral variation in lithofacies across the delineated sandstones. Instantaneous frequency decreases from southwest to northeast which corresponds to decrease in shalines. Reservoir quality information can be predicted or even derived from the estimated petrophysical properties since these parameters such as porosity and volume of shale are sometimes closely associated with rock properties such as sorting, lithofacies and grain maturity.

Keywords

Niger Delta --- facies --- rock physics


Article
Processing and interpretation of 3D seismic data of an oil field in central of Iraq using AVO techniques
معالجة وتفسير البيانات الزلزالية ثلاثية الابعاد لاحد الحقول النفطية في وسط العراق باستخدام تقنيات تغير السعة مع الازاحة

Authors: Anwar A. A. Alsayadi انوار عبداللطيف آل قمر الصيادي --- Khalid S. Al Mukhtar خالد شهاب المختار
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2015 Volume: 56 Issue: 2C Pages: 1728-1738
Publisher: Baghdad University جامعة بغداد

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Abstract

In this research, a qualitative seismic processing and interpretation is made up through using 3D-seismic reflection data of East-Baghdad oil field in the central part of Iraq. We used the new technique, this technique is used for the direct hydrocarbons indicators (DHI) called Amplitude Versus Offset or Angle (AVO or AVA) technique. For this purposes a cube of 3D seismic data (Pre-stack) was chosen in addition to the available data of wells Z-2 and Z-24. These data were processed and interpreted by utilizing the programs of the HRS-9* software where we have studied and analyzed the AVO within Zubair Formation. Many AVO processing operations were carried out which include AVO processing (Pre-conditioning for gathers), AVO modeling and AVO analysis. Analyzing these variations in amplitude within offset or with angle (AVA), reveals the identification of one type of reservoir which is related to the fluid contents and lithology.

في هذا البحث ، تم اجراء دراسة نوعية في معالجة وتفاسير المعلومات الزلزالية وذلك من خلال استخدام بيانات الانعكاس الزلزالي الثلاثية الأبعاد لجزء من حقل شرقي بغداد النفطي والواقع في وسط العراق وضمن الحدود الإدارية لمدينة بغداد . من التقنيات الحديثة المستخدمة لاستكشاف الهيدروكربونات المباشر هي تقنية تغير السعة مع الازاحة (AVO) او مع زاوية السقوط للاشعة الانعكاسية (AVA). لهذا الغرض تم اختيار مكعب من البيانات الزلزالية الثلاثية الابعاد لمرحلة ماقبل النضد بالإضافة إلى بيانات لبئرين وهما ( Z-2 وZ-24). وقد أجري هذا البحث باستخدام منظومة برامجيات HRS -9. ومن خلال الاستفادة من هذه البرامجيات قمنا بدراسة وتحليل تغير السعة مع الازاحة ضمن تكوين الزبير. في عملنا الحالي نفذنا العديد من عمليات AVO والتي تتضمن(معالجة البيانات ، عمل موديلات زلزالية وتحليل بيانات تغير السعة مع الازاحة او الزاوية. استنادا الى تغير السعة مع تغير الازاحة أو الزاوية وعلاقتها بمحتويات السوائل و الخصائص الصخرية اعتمادا على ذلك تم تحديد نوع الصنف للخزان النفطي.

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