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Register a new userPetrological and Sedimentary Study of Shiranish Formation of Upper Cretaceous in Sazaba Oil Fields Region in the North East of Syria
دراسة بترولوجية و ترسيبية لتشكيلة الشيرانيش العائدة للكريتاسي الأعلى في منطقة حقول سازابا النفطية في شمال شرق سورية
1997
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سمحت الدراسة البترولوجية و القياسات الجيوفيزيائية البئرية بتقسيم تشكيلة الشيرانيش في منطقة حقول سازابا إلى ثلاثة مكونات رئيسة (سفلي – أوسط – علوي). كما سمحت بتقسيم كل مكون إلى وحدات و تحت وحدات ليثوستراتغرافية. و قد تبين أن المكون السفلي تسيطر عليه سحنات كلسية غضارية غنية بالمنخربات البلانكتونية مع ظهور الغلوكوني، في حين تسود تناوبات من سحنات كلسية عضوية و كلسية مدلمتة و أحياناً كلسية غضارية ترافقها توضعات من البيريت و الغلوكوني على رسوبيات المكون الأوسط. أما المكون العلوي فيغلب عليه الحجر الكلسي العضوي و الكلسي الحطامي مع تداخلات رقيقة من الكلس المدلمت و الكلس الغضاري الحاوي على مستحاثات قاعية و طافية. كما تبين أن للدياجينيز أثراً واضحاً في رسوبيات هذه التشكيلة تجلى بمجموعة من ظواهر الدلمتة وفق آليتي الدفن و الخلط، و التراص الكيميائي، و التراص الميكانيكي، و السمنتة و المكرتة، و السيلسة.
Shiranish formation in Sazaba Oil fields region had been divided by Petrology study and well Logs measurements to three major members (lower – middle – upper). Then these members have been divided to lithostratigraphic units and subunits. This study showed that the lower member is formed of clayey - limestone rocks rich in planktonic foraminifera and glaconitic sand. The middle member consists of organic limestone facies, dolomitic-limestone, sometimes clayey - limestone rocks with crystals of pyrite and glaconitic sand. Organic- limestone rocks and detrital limestone are predominant in the upper member interbeded by dolomitic-limestone and rare clayey – limestone. This facies contains pelagic and planktonic foraminifera. The role of diagenes phenomenon is evident on Shiranish’s facies through: dolomitization according to burial and miksing processes. It is also clear through chemical compaction, mechanical compaction, cemenation, micretisation and silisification.
References used
Abdulkader, M. A., Arouri, K. R., Boreham, C. J., 2005. Source rock potential the phosphorite-bituminous chalk-marl sequence in Jordan. Marine and petroleum Geology 22: 413-425
Basso, D., 1998. Deep rhodolith distribution in the Pontian Islands, Italy: a model for the paleoecology of a temperate sea. – Palaeogeogr., Palaeoclimat., Palaeoecol., 137, 173-187
Blomeier, D. P. G., Reijmer, J. J. G., 1999. Drowning of a Lower Jurassic carbonate platform: Jbel Bou Dahar, High Atlas, Morocco. – Facies, 41, 81- 110
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The Upper Crétacé rocks of Krashok formation, Massive formation and Shiranish
formation, are very important for petrol and gas reserve, where it is the importance petrol
reserves in Syria. 25 samples of these two formations werestudied.The Massive
formation
had a good Petrological character as reserves rocks ,where it contain calc rocks, which
have good reserving properties, and it cover the hole area , and it contain a petrol. Where
the Shiranish formation is almost homogenies, and contain calc-marl-clay rocks with
foraminifera, and it divide into three zones, depending on it is petro physical properties, the
upper zone is the most absorb of petrol, by comparison whit others zones, which show
there are many indicators reserve characteristicin these formation.
The Petrological study of Clay deposits belonging to the lower
Cretaceous in the northern part of South Palmyra Folding Zone.
Showed they were formed as a result of weathering processes of
igneous rocks within Sedimentary continental climate is ho
t and wet
conditions, and formed lateritic iron soil, followed by enrich,
erosion and washing caused by watery agitate and re-replaced for
short distances within valleys or grooves or local karst cavities, and
later filled by crust erosion materials through the Cretaceous Sea
transgression.
Al Rutba Formation , bellowing to the upper Cretaceous, is one the
main formation of the stratigraphical coumn of Euphrate Depression.
It is importance becomes from that it can statute the principle
petroleum reservoir in high member of the depres
sion fields.
Producing oil and the natural gas.
The importance of this group is to be the main reservoir of oil in
various fields of low oil producing natural gas. The present study is
based on subsurface geological data, presented by cores, well logs and
chemical results of the analyses laboratory.
The Kamshoka formation in Al-Rasafa basin is the second reservoir , because it has
a petroleum importance, where these formation have not petrol in Syria exception in Al-
Rasafa basin, where the fracture calk rock , and dolomite contain a good amou
nt of hairdo
carbonate, so it gave the importance of. Theaim of these research is to do petro logical,
and geneses analyses ofKamshoka formation, and to estimate the storage characters , and
define characters , and kinds and porosity of fracture calk rock , and dolomite, and to
have conclusion about the conditions, and environments of sedimentation, and the stages
of sedimentation development for the all area. The Kamshoka formation showed a good
productivity in some holes which was drilled brand-new, and it gives a hopes to new
discovering in another areas in Syria .
The geophysical surveys on the Syrian oil fields had begun since (1933);it
continued by the soviet groups (1952-1962) and were completed by the Syrian
national groups. The Derro oil field had a good lot from these studies, because
it was surveyed
and studied by the all known geophysical methods (gravity,
geoelectrics, siesmics, well logging).
This was possiple due to the fact that oil bearing formation in the above
mentioned field lays in very shallow depths, in comparison with the known oil
fields, the geoelectrical method was applied with good results and extreme low
cost.
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