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Register a new userSedimentary and Palaeogeographic Evolution of Kurachina Dolomite Formation in the Palmyrian Belt Zone in Syria
التطور الترسيبي و الباليوجغرافي لتشكيلة الكوراشينا دولوميت في حزام الطي التدمري في سورية
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Added by
Damascus University ورقة بحثية
Publication date
2012
fields
Geology
and research's language is
العربية
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Shamra Editor
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هدفَ هذا البحث إلى دراسة التطور الترسيبي و الباليوجغرافي لتشكيلة الكوراشـينا دولوميـت علـى امتداد حزام الطي التدمري. بينت دراسة هذه التشكيلة في نطاقي الطي الشمالي و الجنوبي أنها مؤلفة من مكونين ليثوستراتغرافيين، ينضوي تحت كل منهما مجموعة من الوحدات الليثولوجية. أظهرت الدراسـة البترولوجية لمكونات هذه الوحدات أنها مؤلفة من أربع سحنات متمايزة: كلـسية دولوميتيـة- كلـسية غضارية- غضارية- أنهدريتية، مختلطة أو نقية، و متوضعة وفق تعاقبات إيقاعيـة متكـررة، تجمعهـا متواليات رسوبية حيادية بمعظمها. تشكل السحنات الكلسية و الدولوميتية السحنات الأكثر أهمية و الأكثـر انتشاراً، و تتكون من أوحال (muds) ميكريتية تعرضت و بنسب متفاوتة لعمليات دلمتة معاصرة أو لاحقة للترسيب بآلية الضخ أو الدفن. تتناقص شدة الدلمتة من أعلى نحو أسفل التشكيلة و تزداد من جنوب إلـى شمال السلسلة التدمرية.
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 lithostratigraphic 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.
References used
AlSharhan, A. S., Nairn, A. E. M. (1997). Sedimentary Basins and Petroleum Geology of the Middle East. ELSEVER, Amesterdam, New York, Oxford, Singapore, Tokyo
Beydoun, Z. R. (1988). The Middele East: Regional Geology and Petroleum Resources Scientific Press, P.O.Box 21, Beaconsfield, Bucks, HP9 1NS, U.K
Blatt, H. (1992). Sedimentary Petrology. W. H. Freeman and company, New York
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The Palmyride mountain chain is the main structure in central Syria. It
represents an intracontinental NE-SW trending fold belt, within the northern
part of the Arabian Plate. It is bounded by the Aleppo–Mardine uplift to the
North–West and by the
Hamad Uplift to the South-East.
This study is based mainly on numereous field geological observations. New
informations are obtained about the tectonic behavior of the Palmyride fold
belt. The main faults are generally normal. There is no surface geological
evidence for thrusting within the Palmyrides, as suggested by the authors
before.
The argument to be developed in this study is that the Palmyrides fold belt
owe its existence to the lateral displacement of the Triassic gypsum, not to the
lateral decollement of its overlying series, and consequently no shortening of 20
km as estimated by the authors before.
A simple model is proposed to explain the observed tectonic features. It is
interpreted that this tectonic event induced a master transfer of the Triassic
gypsum under the Arabian Plate movement toward the north and the northeast
at the Neogene time.
The study was made in the region of the NNE-SSW trending Mrah anticline.
This anticline is one of the main anticlines belonging to the Northern part of the
Palmyride fold belt, lying amid Syria, in the northern Arabian plate. The lithostratigraphic
column of the study area consists of the marine sediments of
upper Cretaceous and lower Paleogene age.
The field study involved the description and measurement of the brittle
deformations in ٢٥ sites, which are distributed stratigraphically and
geographically in the different parts of the Mrah anticline. Data processing and
field observations led to a reconstruction of the principal stresses, which
affected the region, and their evolution relative to the main folding phase
(Neogene-Quaternary).
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.
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.
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.
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