Regional correlation and indexing system for Achimov reservoirs in West Siberia Arctic

Sergey A. Gorbunov LLC "Gazprom geologorazvedka" Tyumen, Russian Federation s.gorbunov@ggr.gaxprom.ru
Valeriy V. Ogibenin LLC "Gazprom geologorazvedka" Tyumen, Russian Federation v.ogibenin@ggr.gazprom.ru
Yuriy I. Piatnitskiy PJSC "Gazprom" Moscow, Russian Federation I.Piatnitskiy@adm.gazprom.ru
Alexey A. Nezdhanov LLC "Gazprom geologorazvedka" Tyumen, Russian Federation a.nezhdanov@ggr.gazprom.ru
Alexander A. Spodobaev LLC "Gazprom geologorazvedka" Tyumen, Russian Federation a.spodobaev@ggr.gazprom.ru
Exploration of Achimov HC deposits in the Arctic zone of West Siberia (WS) has been in progress for over 40 years. That timespan is marked by multiple gas condensate and oil discoveries, Achimov Formation represents the main petroleum potentialof Yamal-Nenets Okrug, every year new discoveries are made on top of incremental reserves booked for existing oil and gas condensate pools. Achimov reserves’ scale in WS Arctic is quite unique. However dueto exceptionally complicated structureof Achimov reservoirs and associated HC accumulations there is no appropriate universal correlation and indexing systemto date. The paper proposes uniform system of correlation and indexing of Achimov reservoirs consistent with Neocomian stratigraphy and geological history, based on long-term case studies of well data andseismic information on PLC Gazprom license areas.
Materials and methods
Well and CDP seismic 2D and 3D data on the license areas of PJSC "Gazprom" in Western Siberia and adjacent territories, the materials of bio- and litho-stratigraphic research. Seismic stratigraphy, sequence stratigraphy, petroleum geology.
Results
A unified system of correlation and indexing of Achimov reservoirs for Yamal-Nenets Autonomous District in Western Siberia.
Сonclusions
A "strata-genetic" Achimov reservoirs indexing system, which takes into account their ageand morphological features are proposed. Allocated and tracked 76 Achimov complexes, which are grouped according to the Neocomian "regional stage" responsible tiers international stratigraphic scale and their parts.
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Western Siberia Yamal-Nenets Autonomous District oil and gas Neocomian stratigraphy Achimov Formation