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Late Paleozoic depositional environments in the West Prinovozemelsky zone

UDK: 551.3.051
DOI: 10.24887/0028-2448-2020-1-24-28
Key words: arctic shelf, Barents Sea, carbonate rocks, facies analysis, Late Paleozoic, sedimentation model
Authors: D.Yu. Tkachenko (RN-Shelf-Arctic LLC, RF, Moscow), O.M. Myatchin (RN-Shelf-Arctic LLC, RF, Moscow), A.S. Fedechkina (RN-Shelf-Arctic LLC, RF, Moscow), Yu.V. Reydik (Rosneft Oil Company, RF, Moscow)

Research of the Rosneft Oil Company in the West Prinovozemelsky zone is focused on the reconstruction of the depositional environments of the Paleozoic section of the Admiraltey swell and identifying reservoirs and seals. The study area is situated in the north-eastern part of the Barents Sea basin near the Novaya Zemlya archipelago. It confines to the Admiralty-Prednovozemelsky potentially oil and gas region. Its industrial hydrocarbon potential has not yet been proven. Admiralteyskaya-1 well was drilled within the Admiralty swell. It penetrated terrigenous Upper Permian-Lower Triassic (3695 m) and carbonate Middle Carboniferous-Lower Permian (only 60 m) intervals.

The research is intended to create the most complete (at the present stage of study) depositional model at the Late Paleozoic (Carboniferous-Lower Permian). The work is based on the results of a complex interpretation of seismic data using principles of sequence stratigraphy. Unconformities were chosen as main framework surfaces. Their age reference with some uncertainties was based on a comparison with the rock outcrops on the northern island of the Novaya Zemlya archipelago. As the result of the work two paleo-zones have been identified. They were influenced by different depositional environments. Northeastern zone, located closer to the source area in the Carboniferous and Early Permian is characterized by significant variability in sedimentation. Depositional environments were terrigenous in the Tournaisian-Early Visean and terrigenous-carbonate in the Middle Carboniferous-Permian time. In Upper Visean-Serpukhov reef complex was formed. In the southwestern zone shallow water environments with terrigenous-carbonate deposition dominated during all considered period.

References

1. Gosudarstvennaya geologicheskaya karta Rossiyskoy Federatsii. Masshtab 1:1000000 (State Geological Map of the Russian Federation. Scale 1: 1000000), Page S-38-40. Matochkin Shar (Matochkin Sphere), St. Petersburg: Publ. of Cartographic factory of VSEGEI, 1999, 203 p.

2. Ustritskiy V.I., Tugarova M.A., Barents sea - Permian and Triassic reference section, encountered by the well Admiralteyskaya-1 (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2013, V. 8, no. 2, pp. 1–20, URL: http://www.ngtp.ru/rub/2/ 18_2013.pdf.

3. Nikishin A.M., Tektonicheskie obstanovki. Vnutriplitnye i okrainnoplitnye protsessy (Tectonic environment. Intraplate and marginal plate processes), Moscow: Publ. of MSU, 2002, 366 p.

4. Startseva K.F., Nikishin A.M., Malyshev N.A. et al., Geological and geodynamic reconstruction of the East Barents megabasin from analysis of the 4-AR regional seismic profile (In Russ.), Geotektonika = Geotectonics, 2017, no. 4, pp. 51–67.

5. Stupakova A.V., Structure and petroleum potential of the barents-kara shelf and adjacent territories (In Russ.), Geologiya nefti i gaza, 2011, no. 6, pp. 99–115.

6. Nikishin A.M., Malyshev N.A., Petrov E.I., Geological structure and history of the Arctic ocean, EAGE Publications bv, 2014, 88 p.

Research of the Rosneft Oil Company in the West Prinovozemelsky zone is focused on the reconstruction of the depositional environments of the Paleozoic section of the Admiraltey swell and identifying reservoirs and seals. The study area is situated in the north-eastern part of the Barents Sea basin near the Novaya Zemlya archipelago. It confines to the Admiralty-Prednovozemelsky potentially oil and gas region. Its industrial hydrocarbon potential has not yet been proven. Admiralteyskaya-1 well was drilled within the Admiralty swell. It penetrated terrigenous Upper Permian-Lower Triassic (3695 m) and carbonate Middle Carboniferous-Lower Permian (only 60 m) intervals.

The research is intended to create the most complete (at the present stage of study) depositional model at the Late Paleozoic (Carboniferous-Lower Permian). The work is based on the results of a complex interpretation of seismic data using principles of sequence stratigraphy. Unconformities were chosen as main framework surfaces. Their age reference with some uncertainties was based on a comparison with the rock outcrops on the northern island of the Novaya Zemlya archipelago. As the result of the work two paleo-zones have been identified. They were influenced by different depositional environments. Northeastern zone, located closer to the source area in the Carboniferous and Early Permian is characterized by significant variability in sedimentation. Depositional environments were terrigenous in the Tournaisian-Early Visean and terrigenous-carbonate in the Middle Carboniferous-Permian time. In Upper Visean-Serpukhov reef complex was formed. In the southwestern zone shallow water environments with terrigenous-carbonate deposition dominated during all considered period.

References

1. Gosudarstvennaya geologicheskaya karta Rossiyskoy Federatsii. Masshtab 1:1000000 (State Geological Map of the Russian Federation. Scale 1: 1000000), Page S-38-40. Matochkin Shar (Matochkin Sphere), St. Petersburg: Publ. of Cartographic factory of VSEGEI, 1999, 203 p.

2. Ustritskiy V.I., Tugarova M.A., Barents sea - Permian and Triassic reference section, encountered by the well Admiralteyskaya-1 (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2013, V. 8, no. 2, pp. 1–20, URL: http://www.ngtp.ru/rub/2/ 18_2013.pdf.

3. Nikishin A.M., Tektonicheskie obstanovki. Vnutriplitnye i okrainnoplitnye protsessy (Tectonic environment. Intraplate and marginal plate processes), Moscow: Publ. of MSU, 2002, 366 p.

4. Startseva K.F., Nikishin A.M., Malyshev N.A. et al., Geological and geodynamic reconstruction of the East Barents megabasin from analysis of the 4-AR regional seismic profile (In Russ.), Geotektonika = Geotectonics, 2017, no. 4, pp. 51–67.

5. Stupakova A.V., Structure and petroleum potential of the barents-kara shelf and adjacent territories (In Russ.), Geologiya nefti i gaza, 2011, no. 6, pp. 99–115.

6. Nikishin A.M., Malyshev N.A., Petrov E.I., Geological structure and history of the Arctic ocean, EAGE Publications bv, 2014, 88 p.


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