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Register a new userBiostratigraphycal study of Cretaceous formations in Al-Daww depression /Syria/ and its important in discovering old sediment environmental
دراسة بيوستراتغرافية لتشكيلات الكريتاسي في منخفض الدو/سوريا/ و أهميتها في التعرف على بيئات الترسيب القديمة
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محمد جميل اسماعيل( باحث )
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تمت دراسة تشكيلات الكريتاسي في عدد من الآبار المحفورة في منخفض الدو و ذلك بأخذ /57/ عينة فتاتية بهدف دراسة محتواها المستحاثي من المنخربات و الأوستراكودا, بينت دراسة الأوستراكودا أهميتها إلى جانب المنخربات في التحديد الستراتغرافي و إقامة المضاهاة الطبقية. بالإضافة إلى أهميتهما أيضا في التعرف على بيئة الترسب؛ إذ كانت بيئة الترسيب ضحلة إلى متوسطة العمق بشكل عام ،لكنها تصبح عميقة نسبيا في أعلى تشكيلة الشيرانيش، و قد توافق ذلك مع طبيعة رسوبيات التشكيلات المدروسة، كما بينت المضاهاة الطبقية زيادة سماكات التشكيلات الرسوبية و زيادة عمقها من الشمال الشرقي باتجاه الجنوب الغربي مما يزيد من الآمال النفطية في هذا الاتجاه.
Cretaceous formations have been studied in number of wells at Al_Daww depression by taking /57/ crashed samples for preps of studying their content of fossils of Foraminifers and Ostracoda, study of Ostracoda reveals their important beside the foraminifera in stratigraphic determine and bled up layer correlations. Also, it reveals their important in locating their sediment environment, wither shallow to medium depth in general but it became relatively deep at upper Shiranish formation, and it may be concordant with natural sediment formations studied. Layers correlation reveals’ increase formations thickness and depth from north east toward North West that make more hope for oil in this directions.
References used
AL-SAAD, D., T. SAWAF, A. GEBRAN, M. BARAZANGI, J. BEST AND T. CHAIMOV. Crustal structure of central Syria: the intracontinental Palmyride mountain belt. Tectonophysics, v. 207, no. 3–4, p. 345–358, 1992
BARAZANGI, M., D. SEBER, T. CHAIMOV, J. BEST, R. LITAK, D. ALSAAD AND T. SAWAF. TEctonic evolution of the northern Arabian plate in western Syria. In, E. Boschi, E. Mantovani and A. Morelli (Eds.),Recent Evolution and Seismicity of the Mediterranean Region. Kluwer Academic Publishers, p.117–140. 1993
BEST, J.A.,. Crustal evolution of the northern Arabian platform beneath the Syrian Arab Republic. Unpublished PhD thesis, Cornell University, Ithaca, New York. 152 p, 1991
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Abo Rabah is one of the most important structures in the Al- Daw
basin, because of the great tectonic complexity that has been
exposed during the geological history, and being one of the most
important gas producing areas in Syria. That explains t
he
importance of its study. Our applied studies indicates that there is
significant variation in salt thickness depending on sedimentation
and tectonic factors, which directly affects the kurachine dolomite
gas reservoir, Here lies the importance of this paper.
Sedimentary Formations in Al'Daww Depression has been determined on fossils or strata correlation on upcent of fossils.
We found from geological data processing and analysis of litho logical series to Al'Daww Depression that the important rocks th
at generated oil and gas are belong to Silurian and lower Triassic where as Jurassic sediment does not represent any important, nor upper Cretaceous sediments because its adjacent to surface and invaded by surface water.
Reservoir rocks represented by Markada's Kurashina Dolomite, Butma, Rutba and Judea formations.
The good cover rocks represented by the Tanf, Amanous Shale and Kurrachina Anhydrite 13
as well as the upcent of some cover formations deteriorated the important of some reservoir formations at Al'Daww Depression This study reveal that the subsiding velocity rate to the basin produced the thickness' and made this formations more prospective in general.
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.
This study conducted on 30 sample of ground water, spreaded over most of the Cretaceous formations in the studied area, in order to determine origin and quality of water and evaluate it for the purposes of irrigation and drinking.
The study showed t
hat samples taken are not of the same origin, but of the same hydrochemical type of hydrocarbons. Four sets of formed salts also detected. All samples of this study were valid for irrigation water. The samples taken from Bchuna, Al-Matn, Al- Maran, Kafrdabel, Kassaben sites were safe for drinking, the rest of the samples were not because of the increase of calcium ions concentration. The sample of Ain-Kataa site had an increase in concentration of bicarbonate and potassium ions. An exceeded concentration of the limit of these electrolytes values for drinking water according to the Syrian Standard Specificationswas noticed.
The Palmyra's chain, is one of the Syrian strategic petroleum regions. Thus the
petroleum companies were interested by this structure through the petro-service contracts.
This study focused on petroleum potential of the Mizozoic formations in the N
Palmyra.
The formation thickness variations have permitted to estimate this potentiality
relating to: Kurachina dolomite, Butma, Al- Haramon, and Rutba formations. In the other
side, the other formations are poor. Also, through the results of executed studies, using the
time- map data and the seismic profiles analysis, a new promising structure, El Khashabia,
is proposed. In this structure a new well is suggested, which must be promising as
petroleum potential.
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