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

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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Sedimentological control of the Middle Devonian deposits petroleum potential within the southern plunge of Buzuluk Depression

Authors: Valentina A. ZHEMCHUGOVA graduated from Lomonosov Moscow State University in 1978. She is Doctor of Geological and Mineralogical Sciences, professor of the Department of Geology of Hydrocarbon Systems of Gubkin Russian State University of Oil and Gas. She is specialist in the field of reservoir sedimentology for hydrocarbon systems modeling. She is author of 4 and co-author of 2 monogfaphs and more than 80 scientific publications in national and international journals. E-mail: zem@gds.ru
Oleg M. MYATCHIN graduated from Lomonosov Moscow State University in 2011. He works as geologist at Geophysical Data Systems Ltd. He is post-graduate student of the Department of Geology and Geochemistry of Fossil Fuels of Lomonosov Moscow State University. His research interests are sedimentology and modeling of structure and properties of reservoirs. E-mail: myatchin@gds.ru
Marina I. TRUNOVA graduated from Gubkin Russian State University of Oil and Gas in 1982. She is Candidate of Geological and Mineralogical Sciences, assistant professor of the Department of Geology of Hydrocarbon Systems of Gubkin Russian State University of Oil and Gas. She specializes in the search for oil and gas accumulations in deeply buried deposits. She is author of more than 20 scientific publications. E-mail: mtrunova@gmail.com

Abstract: Significant part of initial resources of the Buzuluk Depression is concentrated within Middle Devonian complex of its southern regions. Complex analysis of the results of macro- and microscopic core studies, seismic and well logging data made the development of the depositional reservoir models of Middle Devo- nian possible. These models became the basis for prediction of oil and gas reservoirs

Index UDK: УДК 552.143(47056:47043):551.734

Keywords: southern plunge of Buzuluk Depression, shallow marine depositional environments, Eifelian, Givetian, reservoirs, depositional reservoir model

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