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Register a new userStudy of changes in reservoir characteristics of Korachina Dolomite Formation (C2, D1) – Middle Triassic in Jihar oil field, using well logging analysis
دراسة تغيرات الخصائص الخزنية لتشكيلة الكوراشينا دولوميت لنطاقي C2 و D1 - ترياسي أوسط في حقل جحار النفطي باستخدام القياسات الجيوفيزيائية البئرية
2011
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Added by
Damascus University ورقة بحثية
Publication date
2014
fields
Geology
and research's language is
العربية
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Shamra Editor
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سمحت القياسات الجيوفيزيائية البئرية، و إعادة تفسير نتائجها باستخدام التقنيات و البرامج الحاسوبية العلمية الحديثة، فضلاً عن تحليل معطيات العينات الصخرية، و نتائج المسح السيزمي ثنائي و ثلاثي البعد، بتعرف الخصائص الخزنية لتشكيلة الكوراشينا دولوميت (KD) العائدة للترياسي الأوسط بنطاقيها (C2, D1) في حقل جحار، و تأثيرها في المأمولية الهيدروكربونية في هذه المنطقة. و قد تبين أن نطاق C2 تسيطر عليه سحنات دولوميتية قليلة الغضار و الانهدريت، مشققة و الشقوق مملوءة بمواد عضوية، و كالسيت، و أنهدريت، و سيليكات، تقطعه بنيات عميدية (ستيللوليت) بشكل جزئي، في حين تسود تناوبات من الحجر الكلسي مع بقايا مستحاثية، و في بعض المجالات دولوميت غضاري ستيللوليتي. أما نطاق D1 فيغلب عليه الحجر الكلسي المتبلور، و ضمن التجاويف يوجد الدولوميت.
All the well logging reinterpretation by using the new softwares, cores analysis and results of seismic 2D and 3D surveys allowed to identify the reservoir characteristics of Kurachina Dolomite Formation of middle Triassic, for two zones (C2, D1) in Jihar field and its affect on hydrocarbon potential in this area. It's found that C2 reservoir consist mostly of dolomite and small amount of shale and anhydrite, fractured and all the fractures are full of organic materials, calcite, anhydrite, silica and little amount of stilolite, while there is succession of limestone and fossil remains, in some places there is shally dolomite. Whereas D1 reservoir is mostly crystalline limestone and the fractures filled with dolomite.
References used
Daoud, Y. 2006. Lithostratigraphic column and the most important properties of formations in Syria
VULAMA, I., LUČIĆ, D., TAKAČ, D. 2003. Kurrachine Dolomite, Amanus Shale Formations and Paleozoic Successions in the Hayan Block of central Syrian Palmyrides
شركة حيان للنفط. التقارير النهائية لآبار حقل جهار. 2002 . دمشق، سورية
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This research highlights on new manner in study of petroleum
reservoir , by integrated between a sedimentary study, which
comprises micro slides from side, and geophysical well logging
interpretation from another side, in Juriba & Transition zone
formation, in ELmhash structure oil field , at Euphrates depression
– west DER Azzor -Syria.
A selection (5) wells in ELmhash structure is Mahash (17-18-11-4-
7).
The available seismic data of Mamlaht Al-Kom field were reinterpreted in
order to define some petroleum potential reflections. The study focused on
Korushina Dolomite (K.D) reflector because of its properties that indicate α
hydrocarbon potential.
Therefore the time map of this formation was
canstructed, structure was defined and the hydrocarbon potential is discussed.
According to the obtained data, we ensure the presence hydrocarbon
potential of the K. D formation, because of its suitable thickness, availability of
cover, and the source rocks. These results should be verified by a 3D surveys
and then drilling operations.
many potentially prolific producers have already been plugged and
abandoned , owing to lack of adequate formation evaluation . For
example , In the early days of log analysis، it was common practice
to regard water saturations above 50% as non-com
mercial.
However, with advances in logging and seismic technology came
the realization that some of those supposedly non-commercial zones
were، in fact، highly productive pays , depending on pore-size
distributionof the rock , movable or immovable fluids and
production probability .
This research aims to study the sedimentary and palaeogeographic
evolution of the Kurachina Dolomite Formation along Palmyrian belt zone.
Studying this formation in its Northern and Southern parts has shown that it
consists of two lithostratigraph
ic members, where each of them includes a
series of lithological units. The petrological study of the components of these
units shows that they are composed of four distinguished facies: Dolomitic
limestones, clayey limestones, clays and anhydrites, pure or mixed, and
deposited in repeated harmonic layers, gathered mostly in neutral sedimentary
sequences. Dolomitic limestones are the most common and important facies,
they are composed of micrite muds which have been subjected, in different
degrees to synsedimentary or late dolomitisation processes through pumping or
burial mechanisms. Dolomitisation intensity decreases downward the formation
and increases laterally from the south to the north of the Palmyrian chain.
In this paper, we will shed light on the applied studies results in
special of deep tectonic situation of the Kurachine dolomite
formation through the seismic sections explained by us, and
establish time and depth maps for this formation, and prop
osing a
well that is supposed to be hydrocarbon potential in the light of
modern data.
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