...M. M. Mandel’baum; K. S. Turitsyn We have studied the main factors that affect the consolidation of terrigenous rocks. The porosity of mudstones of the Nepa Formation (Siberian Platform) is shown to reflect the maximum pressures under which the rocks existed throughout their geologic history. Thus...

... terrigenous deposits (Nepa Formation) from the Talakan, Central-Talakan, and Upper Chona areas. Oil-saturated dolomites were taken from the Preobrazhensky, Ust’-Kut, and Osa horizons. In addition, west of the Upper Chona deposit, samples of the naphthide accumulation from the Gazhena area of the upper Bulai...

... for the introduced stratigraphic units. A new stratigraphic chart is constructed for the Vendian terrigenous strata in the northeast of the Nepa-Botuobiya Anteclise and the adjacent territories. © 2014, IGM, Siberian Branch of the RAS 2014 IGM, Siberian Branch of the RAS Byuk Formation . Distributed...

... [ 1 ]. The field is productive from three rock complexes: a Vendian terrigenous complex (Nepa Formation), a Vendian-Cambrian carbonate complex including the Vendian Tira, Katanga, and Soba Formations, the Vendian-Cambrian Tetere Formation, the Cambrian lower and middle Usol’ye subformations...

.... In the Angara–Lena OGR, the Typta Formation lies after a break both on different formations of the Baikalian system, and on the basement, and it is covered by sandstones of the Vendian Nepa horizon. The Typta Formation is assigned to the Vendian system, to the Vilyuchan horizon. In the Nepa–Botuoba OGR, a long...

.... The Nepa Horizon discontinuously overlies the Vilyuchan Horizon and occurs unconformably on the Riphean formations or on the basement rocks in the areas where the Vilyuchan Horizon is absent. The Nepa Horizon is divided into two subhorizons, commonly composed of sandstones (base) and clayey deposits (upper...

... and Nepa-Botuobiya petroliferous provinces. In the Angara-Lena province, gas fluids played a leading role in the formation of hydrocarbon pools. We consider a geological model, formation conditions, porosity and permeability, and regularities of occurrence of sand reservoirs in the Parfenov producing...

... oscillations (a few meters) of these isotope excursions relative to the formation boundaries in remote boreholes is presumably caused by the spatiotemporal migration of facies. A high-amplitude negative δ 13 C excursion (–8 to –11‰) in the upper Nepa Regional Stage putatively corresponds to the global Shuram...

...I.D. Timoshina This paper is concerned with oils from Upper Precambrian and Lower Cambrian deposits of the Baikit, Katanga, and Nepa-Botuobiyan petroliferous areas (PA) and organic matter (OM) from the Upper Precambrian oil source formations of the Baikit PA, Yenisei Range, and Patom Upland...

... with subcomplex IIIb (Upper Nepa Subhorizon or Lower Ayan Horizon, according to the 1979 scheme). Thus, there must be an enormous gap within the continuous section of the Nepa Formation fairly uniform in composition, since beds with the Lontova microfossil complex are missing ( Fig. 2 ). Judging from SSF...

...V.A. Kashirtsev; A.E. Kontorovich Chromato-mass-spectrometric studies of fractions of saturated and aromatic hydrocarbons from oils and oil shows of the Nepa-Botuobiyan and Aldan anteclises as well as chloroform extracts from mudstones of the Lower Cambrian Sinyaya Oil Shale Formation have revealed...

... in the bottom of the Vendian-Lower Cambrian subsalt carbonate complex in the base of the Katanga Formation, is the reservoir bed of the Erema-Chona OF. Its thickness varies from 6 to 24 m (within the field – from 15 to 24 m). In the northwest of the Nepa-Botuobiyan PP, in the northern half of the oil...