Sustainable mid-term development of the petroleum industry depends on many factors, and the key of them is recoverable (with current technologies) and economic oil reserves supply to the raw material base. Between 2003 and 2018 there was a reproduction of recoverable oil reserves on a large scale. For a reliable assessment of oil production levels, in addition to recoverable reserves it is also necessary to take into account economic reserves, which became possible after the introduction of the 2013 Classification and making the entire architecture of resources and reserves project-oriented. Ongoing analysis of recoverable and economic reserves interconversion allows not only to plan amount of oil production, but also to create a scientifically based system of state management of hydrocarbon reserves. The state and companies-subsoil users get an opportunity of iterative modelling of development options and searching for the most optimal of them in terms of both cost effectiveness and sustainable subsoil use. The results of HC reserves inventory taking in different economic scenarios conducted in 2019-2020 by the decision of the Russian government allowed drawing conclusions on both categories and amount of difficult-to-recover reserves in Russia and possible consequences of changes in economic scenarios of fields development, and also on the need for routine proceeding of this work.
1. Strategiya razvitiya mineral'no-syr'evoy bazy Rossiyskoy Federatsii do 2035 goda (Development strategy of the mineral resource base of the Russian Federation until 2035), URL: http://static.government.ru/media/files/WXRSEBj6jnRWNrumRkDakLcqfAzY14VE.pdf.
2. Preobrazovanie nashego mira: Povestka dnya v oblasti ustoychivogo razvitiya na period do 2030 goda (Transforming Our World: An Agenda sustainable development for the period up to 2030), UN, 2015, URL: https://unctad.org/system/files/official-document/ares70d1_ru.pdf.3. Klassifikatsiya zapasov i resursov nefti i goryuchikh gazov (Classification of reserves and resources of oil and combustible gases), 2013, URL: http://docs.cntd.ru/document/499058008.