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Article
Seismic and Velocity Study of Luhais Oil Field Using Velocity Model
دراسة زلزالية وسرعية لحقل اللحيس النفطي باستخدام موديل السرع

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Abstract

In this study, a qualitative seismic velocity interpretation is made up through using 2D-seismic reflection data on Luhais oil field in southern of Iraq which is situated at about 105 Km to the east from the Basra city. Luhais oil field was chosen to study the type and nature of the distribution of the seismic velocities of Nahr Umr and Zubair Formations in order to show its explorational importance, where these formations contain abundant quantities of hydrocarbons. Picking of the tops of Nahr Umr and Zubair was carried out from the synthetic seismogram which is calculated from sonic-logs and check shot of well Lu-2. Velocity model was obtained via using an implementation of Petrel program version, 2013 and was corrected according to tops well that drilled in the study area. Average velocity slices (vertically and horizontally) and maps are carried out from the velocity model

تم أجراء دراسة تفصيلية نوعية سرعية في التفاسير الزلزالية وذلك من خلال أستخدام بيانات الانعكاس الزلزالي الثنائي الأبعاد لحقل اللحيس النفطي في جنوب العراق والذي يبعد شرقا عن مدينة البصرة حوالي 105 كم. لقد تم أختيار حقل اللحيس النفطي لأجراء دراسة عن نوع وطبيعة توزيع السرع الزلزالية لتكويني نهر عمر والزبير وذلك لأهمية المنطقة من الناحية الاستكشافية. أذ يحتوي على كميات وفيرة من الهيدروكابونات خصوصا في تكويني نهر عمر والزبير. في بداية البحث تم عمل الأثر الزلزلي المصنع للبئر المحفور ضمن منطقة الدراسة (لحيس-2) بأستخدام المجس الصوتي والسرع الزلزالية للبئر المذكور. وعلى ضوء ذلك تم تعريف والتقاط العواكس الزلزالية المطلوب دراستها في هذا البحث وهي (أعلى عاكس نهر عمر, أعلى عاكس الزبير). كذلك تم بناء موديل سرع ضمن تطبيقات برنامج Petrel)) والمصحح نسبة الى أعماق التكوينات المستحصلة من الابار المحفورة ضمن منطقة الدراسة ومنه تم عمل شرائح سرعية معدلية (عمودية وافقية) وخرائط سرع معدلية.


Article
Structural subsurface model of Samawa-Diwan area (south of Iraq)

Authors: Nawal Abed Al-Ridha --- Ghazi H. AL-Sharaa --- Suhail U. Muhsin
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2018 Volume: 59 Issue: 4A Pages: 1920-1935
Publisher: Baghdad University جامعة بغداد

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Abstract

Seismic instantaneous phase attribute was applied for conventional seismic interpretation (structural interpretation) on 3D seismic cube of 1914.72km² of Samawa-Diwan area, located in the south part of Iraq within Muthna governorate. Instantaneous phase section is very important to detect structural and stratigraphic features. Six reflectors represent Upper Jurassic and Cretaceous formations were defined from synthetic seismogram of wells in study area, then picked over seismic cube. Fault boundaries maps for each horizon were drawn depending on horizon contacts then fault planes were constructed. Finally, a 3D structural model was constructed in time domain, then converted to depth domain by using 3D average velocity model. Structurally, 3D models showed that study area affected by two types of normal faults formed a graben appear at west side a long study area, and separated by transverse fault to the north and south parts at Hartha Fn. and deep layers, while Tertiary formations have not affected by any type of faults systems. Also, structural map showed existence of four structural domes which they are Samawa and Diwan folded domes, Samawa south faulted dome and fourth one is new folded dome locates in the northwest of study area. All these features extend in northwest-southeast trend.

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