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2018/4
Mechanism of formation of primary porosity in Vendian-Cambrian biocenoses
Geosciences

Authors: Victoria A. LOSHKAREVA graduated from Gubkin Russian State University of Oil and Gas (National Research University) in 2016, she is Assistant Lecturer of the Department of Lithology of Gubkin Russian State University of Oil and Gas (National Research University). E-mail: viyurr@gmail.com
Olga V. POSTNIKOVA is Doctor of Geological and Mineralogical Sciences. She graduated in 1979 from Gubkin Moscow Institute of Petrochemical and Gas Industry. Her academic interest is the lithology of reservoirs. She is author of more than 80 scientific publications, including 35 articles in journals from the list of the Higher Attestation Commission of the Russian Federation.
E-mail: olga.postnikova@yandex.ru
Irina A. KITAEVA is Assistant Lecturer of the Department of Lithology of Gubkin Russian State University of Oil and Gas (National Research University). She is author of 33 scientific publications. E-mail: irina_kitaeva@bk.ru

Abstract: The paper isolated and described various types of cyano-bacterial biocenoses lying in base of Vend-Cambrian reservoir rocks. The mechanism of formation of primary porosity of carbonate reservoir rocks of productive horizons of oil and gas fields of Nepsko-Botuoba anteclise was identified

Index UDK: 552.54

Keywords: Eastern Siberia, Nepsko-Botuoba anteclise, vendian-cambrian, cyano-bacterial biocenoses, kaltsibionty, stromatolites, primary porosity, reservoir rock

Bibliography:
1. Bacterial paleontology. M.: PIN RAS, 2002, 188 p.
2. Maslov V.P. Stromatolites (Their genesis, methods of study, connection with facies, and geological significance on the example of the Ordovician of the Siberian platform). Tr. GIN AN SSSR. M.: Nauka, 1960, vyp. 41, 188 p.
3. Terleev A.A., Luchinina V.A. New facts on the establishment of the nature of the genus Epiphyton Bornemann, 1886. News of paleontology and stratigraphy. Ad. to the journal. “Geology and geophysics”, 2000, vyp. 2-3, p. 173-177.
4. Maslov V.P. Atlas of rock-forming organisms. M.: Nauka, 1973.

2017/2
Mineralogical features of Osinskiy horizon carbonate reservoir rocks of Nepsko-Botuoba anteclise
Geosciences

Authors: Andrey S. KUZNETSOV is post-graduate student and senior engineer of the Department of Lithology of Gubkin Russian State University of Oil and Gas (National Research University). E-mail: andrey.kuznecov.91@mail.ru
Irina A. KITAEVA is Assistant Lecturer of the Department of Lithology of Gubkin Russian State University of Oil and Gas (National Research University). E-mail: irina_kitaeva@bk.ru

Abstract: The main carbonate deposits rock types of Osinskiy horizon of Nepsko-Botuo- ba anteclise were distinguished and characterized. The detailed mineralogical analysis of distinguished lithotypes, which was perfomed by the methods of x-ray diffractometry and microprobe analysis, detected a wide spectrum of authigenic minerals, such as halite, anhydrite, ankerite, graphite, cuboargyrite etc., in limestone and dolomite rocks. The ankerite formation mechanism was validated. The absence of direct correlation between potassium anomalies in Osinskiy horizon basement and presence of clay minerals were determined. The minerology of intervals with increased radioactivity values was characte-rized

Index UDK: 551.7.022

Keywords: carbonate rocks, minerology, lower Cambrian, Osinskiy horizon, Nepsko-Botuoba Anteclise, Siberian platform

Bibliography:
1. Dmitrievsky A.N., Kuznetsov V.G., Iluhin L.N., Postnikova O.V. and colleagues Structure and conditions of formation of Osinskiy horizon of the south part of Siberian platform complimented by it’s oil-and-gas content. Prediction of oil and gas occurrence of East Siberia. MINHiGP, 1990, p. 23-28.
2. Eskin A.A. Morphological and genetic types of the void space structures of carbonate rocks and factors of their formation (evidence from the eastern side of Melekesskaya depression and the western side of Yuzhno-Tatarsky arch). Author’s abstract candidate of geological and mineralogical sciences. Kazan, 2014, p. 21.
3. Konovalceva E.S. Secondary processes in reservoir rocks of productive sediments of Yaractinski deposit. Neftegazovaya Geologiya. Teoriya I Praktika, 2010, no. 5, p. 6-7. http:// www.ngtp.ru/rub/2/18_2010.pdf
4. Neruchev S.G. Periods of radioactivity on the Earth surface and their influence on the orga- nic world revolution. Neftegazovaya Geologiya. Teoriya i praktika, 2007, no. 2, p. 3-8. http:// www.ngtp.ru/rub/10/032.pdf