N.V. Mel’nikov
Detailed stratigraphic chart of Vendian Play in the Nizhneangarsky independent oil and gas bearing area (Lena-Tungussky Province of Siberian Platform)
DOI 10.47148/0016-7894-2026-2-7-19
Key words: Nizhneangarsky independent oil and gas bearing area; Vendian; member; regional cyclothem; regional hiatus; correlation lines; stratigraphic chart; Vilyuchansky, Nepsky, Tirsky, Danilovsky horizons.
For citation: Mel’nikov N.V. Detailed stratigraphic chart of Vendian Play in the Nizhneangarsky independent oil and gas bearing area (Lena-Tungussky Province of Siberian Platform). Geologiya nefti i gaza. 2026;(2):7–19. DOI: 10.47148/0016-7894-2026-2-7-19. In Russ.
Regional stratigraphic units are identified in accordance with the 1983 Chart, where the cyclic structure of Vendian deposits is documented, and regional nondepositional unconformities are shown. These features made a basis for substantiation of large sedimentation stages that have a status of regocyclites (regional sedimentary cycles) formed as a result of eustatic warping movements. There were three stages of building a stratigraphic chart of Vendian deposits. In the first of them, a set of correlation lines across the wells is created. Each of the correlation lines demonstrates formation-by-formation, member-by-member, and layer-by-layer stratigraphic structure of each of the wells and horizons. In the second stage, interpretation of these composite logs is carried out. A set of charts describe the areas with different completeness of the Vendian cross-section structure. In the last stage, the detailed stratigraphic chart is created, where lithological and stratigraphic intervals with different structure of Vendian sequence are delineated. For the territory of the Nizhneangarsky independent oil and gas bearing area, differences in member-by-member architecture of the Vilyuchansky, Nepsky, Tirsky, and Danilovsky horizons, and formations are shown. Matching the basal part of Vendian Danilovsky, Tirsky, and Nepsky horizons in the eastern part of the Nizhneangarsky independent oil and gas bearing area allowed revealing a long-term pre-Danilovsky hiatus — because of the absence of members and several short-term hiatuses. In the west of the independent oil and gas bearing area, matching of Tirsky and Nepsky horizons showed that lithological composition and sequence of members typical of the eastern part are preserved, although their thickness decreases. The western Vendian section differs — the Ilbokichsky Member is replaced by the Redkolesny Formation. In the western part, the Moshkovsky Fm contains the same units as in the eastern part. Vilyuchansky and Nepsky horizons demonstrate considerable thickness decrease from east to west.
Nikolai V. Mel’nikov
Doctor of Geological and Mineralogical Sciences, Professor
Chief Expert
Siberian Research Institute of Geology, Geophysics and Mineral
Raw Materials,
67, prospect Krasnyi, Novosibirsk, 630091, Russia
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