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The type section of the Maikop Group (Oligocene-lower Miocene) at the Belaya River (north Caucasus); depositional environment and hydrocarbon potential

Reinhard F. Sachsenhofer, Sergey V. Popov, Mikhail A. Akhmetiev, Achim Bechtel, Reinhard Gratzer, Doris Gross, Brian Horsfield, Alessandra Rachetti, Bernhard Rupprecht, Wolfgang B. H. Schaffar and Nina I. Zaporozhets
The type section of the Maikop Group (Oligocene-lower Miocene) at the Belaya River (north Caucasus); depositional environment and hydrocarbon potential
AAPG Bulletin (March 2017) 101 (3): 289-319

Abstract

The type section of the Oligocene to lower Miocene Maikop Group, considered the main source rock in the eastern Paratethys, has been studied using geochemical proxies to gain insights into depositional setting and hydrocarbon potential. The Maikop Group at the type section is approximately 600 m (2000 ft) thick. Deposition commenced after a major late Eocene sea level drop and a subsequent early Oligocene sea level rise. The Maikop Group is composed mainly of carbonate-free pelitic rocks. Calcareous rocks are limited to the lower Oligocene succession, including the Polbian Bed that forms a basin-wide marker horizon deposited during a time with significantly decreased salinity (Solenovian event). Anoxic conditions prevailed and were only interrupted for longer periods during deposition of the lower part of the lower Oligocene Pshekha Formation, the Polbian Bed, and the lower Miocene Olginskaya Formation. Total organic carbon (TOC) contents range up to 3.5 wt. %. Hydrogen index values are typically less than 300 mg hydrocarbons (HC)/g TOC but reach 420 mg HC/g TOC in black shales overlying the Polbian Bed (lower Morozkina Balka Formation). Organic richness of this level, approximately 10 m (33 ft) thick, is controlled by low salinity and high bioproductivity. The Maikop Group could generate approximately 2.0 t HC/m (super 2) surface area. A significant part (0.45 t/m (super 2) ) comes from the lower Morozkina Balka Formation, which generates a high-wax paraffinic-naphthenic-aromatic mixed oil. The Pshekha, upper Morozkina Balka, and Batalpashinsk Formations would generate low-wax oil or condensate. The hydrocarbon generation potential of the overlying formations is minor. Overall, the generation potential of the Maikop Group is surprisingly low.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 101
Serial Issue: 3
Title: The type section of the Maikop Group (Oligocene-lower Miocene) at the Belaya River (north Caucasus); depositional environment and hydrocarbon potential
Affiliation: Montanuniversitaet Leoben, Department of Applied Geosciences and Geophysics, Leoben, Austria
Pages: 289-319
Published: 201703
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 84
Accession Number: 2017-030477
Categories: Economic geology, geology of energy sourcesStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart, sect., strat. cols., 2 tables, sketch maps
N44°00'00" - N45°00'00", E40°00'00" - E41°00'00"
Secondary Affiliation: Russian Academy of Sciences, Paleontological Institute, RUS, Russian FederationGeoForschungsZentrum Potsdam, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 201718
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