... stratigraphic division is the Olenchima Member (base of the Evenk Formation) underlain by a hiatus. The term Kochumdek Formation is no longer used in the Bakhta region and its lithologically distinct subformations (Yasenga, Moktakon, Mara, and Abakun) were raised to formation rank. The Olenchima Formation...

... Formation, and is mainly comprised by dolomites. The effective porosity of the reservoir holds the first several percent, occasionally rising up to 9% in certain wells. Ubiquitously documented within the studied area, salt beds of the Lower Vendian Yasenga Formation represent a fluid seal for the Ust’-Kut...

...Fig. 3. A fragment of the model for heating of the sedimentary cover by trap intrusions (South Tunguska petroliferous region). Zones of heating, °C: 1 – 700–500, 2 – 500–300, 3 – 300–150, 4 – < 150; 5 – traps; 6 – oil; 7 – gas; 8 – boreholes. Formations tn-dl – Tanachi...

..., Devonian; S 2 , upper Silurian; S 1 , lower Silurian; O 2 , Middle Ordovician; Є 3 , upper Cambrian; Є 2 , middle Cambrian; Є 1 , lower Cambrian; V, Vendian. Formations: di, D’yavolskii; vl + mg, Valek and Mogokta; nr, Neruchanda; bk, Baikit; um, Ust’-Mundui; up, Ust’-Pelyadka; lt, Letnyaya; ol, Olenchimo...