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Visean siliciclastic deposits – one of the major prospects in the offshore part of Pechora-Kolva aulakogen

UDK: 553.98(470.13)
DOI: 10.24887/0028-2448-2019-12-91-94
Key words: Visean siliciclastic deposits, Kozhimsky superhorizon, facies, well data, sedimentation model, depositional environments, deltaic coast, bar-deltaic complex, Pechora Sea
Authors: S.V. Grishechkina (RN-Shelf-Arctic LLC, RF, Moscow), E.O. Malysheva (RN-Shelf-Arctic LLC, RF, Moscow), V.V. Obmetko (Rosneft Oil Company, RF, Moscow)

Regional geological studies carried out by Rosneft Oil Company in the offshore of the Pechora oil and gas basin are focused on the study of various petroleum plays, including Lower Carboniferous Visean (C1v) siliciclastic play. This play is of interest because of several confined discoveries of oil and gas fields within onshore part of the basin. Current study was intended to analyze facies distribution and predict most favorable for hydrocarbon accumulation areas and intervals.

The article presents results of the research of considered interval. The interpretation of 2D regional lines and 3D seismic data within license areas, core studied in three wells and logs from nine wells penetrated the Lower Visean were used as the basis of the study. The data from adjacent onshore areas and the results of the previous works were applied as well. Methodological approach comprised seismic stratigraphy, facies and seismic facies analysis and included several stages. Complex interpretation of well and seismic data were followed by time and depth thickness maps, seismic attribute maps, seismic facies analysis and resulted in facies and paleogeographic interpretation of all data. Zones of deep and shallow open shelf , depressions and shoals, deltaic coast and denudation coastal plain have been interpreted. Bar-deltaic complex with thick very likely sandy interval has been identified in the western part of Pechora-Kolva aulokogen. It is regarded as one of the major prospects.

References

1. Prirodnye rezervuary v terrigennykh formatsiyakh Pechorskogo neftegazonosnogo basseyna (Natural reservoirs in terrigenous formations of Pechora oil and gas Basin): edited by Dedeev V.A., Syktyvkar: Publ. of Komi nauchnyy tsentr UrO Rossiyskoy akademii nauk, 1993, 151 р.

2. Teplov E.L., P.K. Kostygova, Larionova Z.V. et al., Prirodnye rezervuary neftegazonosnykh kompleksov Timano-Pechorskoy provintsii (Natural reservoirs of oil and gas bearing complexes of the Timan-Pechora province), St. Petersburg, Renome Publ., 2011, pp. 176–181.

3. Nikonov N.I., Bogatskiy V.I., Martynov A.V. et al., Timano-Pechorskiy sedimentatsionnyy basseyn. Atlas geologicheskikh kart (litologo-fatsial'nykh, strukturnykh i paleontologicheskikh) (Timano-Pechora sedimentary basin. Atlas of geological maps (lithologic-facies, structural and paleontological)), Ukhta: Regional'nyy dom pechati Publ., 2000, 152 p.

4. Margulis E.A., Evolution of the Barents Sea region and its hydrocarbon systems (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2009, no. 4., URL: http://www.ngtp.ru/rub/5/24_2009.pdf

Regional geological studies carried out by Rosneft Oil Company in the offshore of the Pechora oil and gas basin are focused on the study of various petroleum plays, including Lower Carboniferous Visean (C1v) siliciclastic play. This play is of interest because of several confined discoveries of oil and gas fields within onshore part of the basin. Current study was intended to analyze facies distribution and predict most favorable for hydrocarbon accumulation areas and intervals.

The article presents results of the research of considered interval. The interpretation of 2D regional lines and 3D seismic data within license areas, core studied in three wells and logs from nine wells penetrated the Lower Visean were used as the basis of the study. The data from adjacent onshore areas and the results of the previous works were applied as well. Methodological approach comprised seismic stratigraphy, facies and seismic facies analysis and included several stages. Complex interpretation of well and seismic data were followed by time and depth thickness maps, seismic attribute maps, seismic facies analysis and resulted in facies and paleogeographic interpretation of all data. Zones of deep and shallow open shelf , depressions and shoals, deltaic coast and denudation coastal plain have been interpreted. Bar-deltaic complex with thick very likely sandy interval has been identified in the western part of Pechora-Kolva aulokogen. It is regarded as one of the major prospects.

References

1. Prirodnye rezervuary v terrigennykh formatsiyakh Pechorskogo neftegazonosnogo basseyna (Natural reservoirs in terrigenous formations of Pechora oil and gas Basin): edited by Dedeev V.A., Syktyvkar: Publ. of Komi nauchnyy tsentr UrO Rossiyskoy akademii nauk, 1993, 151 р.

2. Teplov E.L., P.K. Kostygova, Larionova Z.V. et al., Prirodnye rezervuary neftegazonosnykh kompleksov Timano-Pechorskoy provintsii (Natural reservoirs of oil and gas bearing complexes of the Timan-Pechora province), St. Petersburg, Renome Publ., 2011, pp. 176–181.

3. Nikonov N.I., Bogatskiy V.I., Martynov A.V. et al., Timano-Pechorskiy sedimentatsionnyy basseyn. Atlas geologicheskikh kart (litologo-fatsial'nykh, strukturnykh i paleontologicheskikh) (Timano-Pechora sedimentary basin. Atlas of geological maps (lithologic-facies, structural and paleontological)), Ukhta: Regional'nyy dom pechati Publ., 2000, 152 p.

4. Margulis E.A., Evolution of the Barents Sea region and its hydrocarbon systems (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2009, no. 4., URL: http://www.ngtp.ru/rub/5/24_2009.pdf


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