NDLI: Evaluation of the ASL and Hawara formations using seismic- and log-derived properties, October Oil Field, Gulf of Suez, Egypt

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Evaluation of the ASL and Hawara formations using seismic- and log-derived properties, October Oil Field, Gulf of Suez, Egypt

Content Provider	Springer Nature Link
Author	Lashin, Aref Al Arifi, Nassir Abu Ashour, Nassir
Copyright Year	2009
Abstract	October Field is one of the most prolific offshore oil fields in the Gulf of Suez of Egypt. It consists of a number of marine platforms and produces oil from different reservoirs of different geological ages from the Lower Cretaceous to the Miocene. The aim of this study was to enhance a seismic-log evaluational procedure to evaluate the Miocene-aged Asl and Hawara Formations which encounter the main hydrocarbon and source rock potentials in the area North of October Oil Field. The well logging data, the borehole seismic data, and the velocity surveys are all used in this study. A number of synthetic seismograms are constructed and interpreted together with the deduced seismic impedance and reflection coefficient data for many wells in the study area. In addition, a comprehensive velocity analysis is performed using the seismic times and the computed average and interval velocities. These seismic-derived parameters are primarily used in recognizing and locating precisely the marl and sand sections of Asl Formation which show low to middle amplitudes. Furthermore, a quantitative well logging analysis is carried out over Asl and Hawara Formations to shed light over their hydrocarbon potentiality. Good oil saturation is exhibited by the Asl sand section which reaches to more than 90% in the southern parts of the study area. The petrophysical characters of this sand are very good in terms of good effective porosity (9% to13%), low shale volume (V $_{sh}$ < 5%), and high oil saturation (S $_{h}$ > 85%). The sections of the Asl marl and the Hawara shale on the other hand are considered completely wet. An integrated model making use of the seismic- and log-derived properties is applied over the two studied formations for better understanding the reservoir of interest. Many relations are constructed between velocity, seismic impedance, and the rock pore spaces on one hand and between the velocity, lithology, and fluid content on the other hand. This study revealed that the sand section attains very good oil-bearing potentiality in the study area and proved that the application of an integrated model of the log- and seismic-derived properties led to an enhanced evaluation of the Asl and Hawara Formations, good discrimination between their lithological components besides precise differentiation from the overlying Middle to Late Miocene sections.يعد حقل أكتوبر للزيت أحد أهم حقول البترول البحرية Off-shore المنتجة للزيت في خليج السويس بمصر، فهو يتكون من مجموعه من الأرصفة البحريةPlatforms و ينتج من عده خزانات ذات عصور جيولوجية مختلفة تتراوح من الطباشيري السفلي إلي الميوسين. تهدف هذه الدراسة إلي تطبيق نموذج تقييمي يعتمد علي خواص مشتقه من البيانات السيزمية و تسجيلات الآبار و ذلك لتقييم تكويني "عسل" و "هواره" ذا العصر الميوسيني، حيث يحوي هذان التكوينان علي الجهود الهيدروكربونيةHydrocarbon Potentiality و المصدرية الرئيسية للزيت في منطقه شمال حقل أكتوبر. استخدم في هذه الدراسة العديد من تسجيلات الآبار بالإضافة إلي البيانات السيزمية البئرية و بيانات تسجيلات السرعة. كما تم إنشاء و تفسير مجموعه من السيزموجرامات التخليقية Synthetic seismograms مع كل من الممانعة الصوتية و معامل الانعكاس للعديد من الآبار في منطقه الدراسة. بالاضافه إلي هذا تم عمل تحليل كمي للسرعة باستخدام الزمن السيزمي و السرعات المتوسطة و الفترية المقاسة. هذا وقد استخدمت المعاملات المشتقة من البيانات السيزمية بصفه أساسيه و بدقه في تعيين و تحديد نطاقات المارل و الحجر الرملي لتكوين "عسل" ذات السعه القليلة إلي متوسطة Low to middle amplitude . بالاضافه إلي ذلك تم عمل تحليل كميQuantitative analysis متكامل لتكويني "عسل" و "هواره" باستخدام تسجيلات الآبار و ذلك لإلقاء الضوء علي الجهد الهيدروكربونية لكل منهما. وقد أظهر التحليل الكمي احتواء تكوين "عسل علي تشبعات جيده من الهيدروكربونات تصل إلي أكثر من 90%. كما أوضح أن الخواص البتروفيزيقية لهذا الخزان جيده جده و خاصة في الأجزاء الجنوبية من منطقه الدراسة حيث تتراوح المسامية الفعالةEffective porosity ما بين 9% و 13% و التشبع بالزيت إلي أكثر من 85%، في حين يتضاءل حجم الطفلةShale volume إلي اقل من 5%. و من ناحية أخري اعتبرت صخور الطفل و المارل الخاصة بتكوين "هواره" و الجزء العلوي من تكوين "عسل" نطاقات مشبعه كاملا بالماء Wet zones. تم تطبيق نموذج متكاملIntegrated model يجمع ما بين الخواص السيزمية و البتروفيزيقية و ذلك لفهم طبيعة و خواص التكوينين قيد الدراسة بصوره أفضل. و في هذا الصدد تم إنشاء العديد من العلاقات بين السرعة و الممانعة السيزمية و المسامية الصخرية من ناحية، و بين السرعة والمكونات الصخرية و المحتوي من السوائل من جهة أخري. بصفه عامة أكدت هذه الدراسة علي الخواص الهيدروكربونية المميزه لنطاق الحجر الرملي الخاص بتكوين "عسل" و خاصة في الأجزاء الجنوبية من منطقه الدراسة، كما أثبتت أن تطبيق النموذج المتكامل الذي يجمع ما بين الخواص السيزمية والاخري البتروفيزيقية المشتقة من تسجيلات الآبار قد أدي إلي تحسين تقييم التكوينات المدروسة بدرجه كبيره، فضلا عن تحديد مكوناتهما الصخرية بصوره أوضح، بالاضافه إلي فصلهم الدقيق عن رواسب الميوسين التي تعلوهم.
Starting Page	365
Ending Page	383
Page Count	19
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	4
Issue Number	3-4
e-ISSN	18667538
Language	Arabic
Publisher	Springer-Verlag
Publisher Date	2009-07-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Evaluation Logging Velocity analysis Seismic properties October Field Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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