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2019/3
Facies Analysis and Depositional Environments of the Lower Miocene Formations in the Garmian block, Kurdistan, Iraq
Geosciences

Authors: Kardo S. MOHAMMED graduated from the University of Sulaimani in 2002 (B.Sc.), in 2010 (M.Sc.) in the same university, and graduated from the Gubkin Russian State University of Oil and Gas (National Research University) in 2016 (M.Sc.). He is post-graduate student at the Department of Geology of Hydrocarbon Systems of Gubkin Russian State University of Oil and Gas (National Research University). His scientific interests are related to petrophysical analysis and reservoir modeling. He is author of 2 scientific publications. E-mail: kardo80@yahoo.com
Natalia N. KOSENKOVA graduated from Lomonosov Moscow State University in 1980. She is Candidate of Geological and Mineralogical Sciences, associate professor of the Department of Geology of Hydrocarbon Systems at Gubkin Russian State University of Oil and Gas (National Research University). She is specialist in the field of oil and gas fields exploration. She is author of 4 monographs and more than 20 scientific publications in Russian and international periodicals. E-mail: N.N.Kosenkova@gubkin.ru

Abstract: The article uses data on the recently discovered oil fields of Sargala and Shakal, in the zone of the Kirkuk basin of the Zagros folded-thrust belt. The Lower Miocene formations (Euphrates and Jeribe) are the target objects of the tertiary oil and gas system in Iraqi Kurdistan, along with the Oli- gocene (Kirkuk). Formations are composed of carbonates with a few interbeds of evaporites of the Dhiban formation. In the framework of this study, 15 facies were identified based on the analysis of faunal residues (mainly benthic foraminifera) and texture-structural characteristics of sedimentary rocks. The facies of the Jeribe formation showed to be deposited of the inner part of the carbonate ramp, while the Dhiban formation corresponds to the conditions of the coastal Sebkha and isolated lagoon and shallow waters of the open sea. The Euphrates Formation was deposited in an open shallow-marine environment to the isolated lagoon

Index UDK: 550.8

Keywords: facies analysis, sedimentary environments, Lower Miocene formations, Jeribe, Dhiban, Euphrates, basal anhydrite, Kurdistan

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2019/2
Diagenesis processes and their effect on reservoir properties of the Lower Miocene reservoirs in the Garmian block, Kurdistan, Iraq
Geosciences

Authors: Kardo Sardar MOHAMMED graduated from the University of Sulaimani in 2002 (B.Sc.), in 2010 (M.Sc.) in the same university, and graduated from the Gubkin State University of Oil and Gas in 2016 (M.Sc.). He is post-graduate student at the Department of Geology of Hydrocarbon Systems of Gubkin University. His scientific interests are related to petrophy-sical analysis and reservoir modeling. He is author of 2 scientific publications. E-mail: kardo80@yahoo.com
Marina I. TRUNOVA graduated from Gubkin Russian State University of Oil and Gas in 1982. She is Candidate of Geological and Mineralogical Sciences, associate Professor, senior lecturer of the Department of Geology of Petroleum Systems of Gubkin University. She is specialist in the field of oil and gas fields exploration. She is author of more than 20 scientific publications.
E-mail: mtrunova@gmail.com

Abstract: In the Iraqi Kurdistan, the most significant oil deposits are concentrated in the Cretaceous and lower Miocene sediments. In this paper we used data on the recently discovered Sarqala and Shakal oilfields. The Lower Miocene formations of Euphrates and Jeribe are the main target objects of the tertiary oil and gas system in the Iraqi Kurdistan. The formations are composed of carbonates with a few interbeds of evaporites of the Dhiban formation. The rocks of the studied formations are affected by a number of diagenetic processes, including dolomitization, micritization, cementation, neomorphism, leaching, compaction, styllolitization, pyritization and anhydration. The most significant of these are the processes of dolomitization, dissolution, neomorphism, cementation and compaction. The processes of dolomitization and dissolution improve the quality of reservoirs, while neomorphism, carburization and compaction have a negative effect. Fracturing plays a significant role in the increased porosity and permeability of the rocks studied, mainly in calcareous mudstone and wackestone.

Index UDK: 552.5 (419)

Keywords: diagenesis processes, reservoir properties, lower miocene forma-tions, Jerib, Dhiban, Euphrates, Kurdistan, Iraq

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