...Fig. 5. Bratsk field, profile 5. Cross sections of logarithmic resistivity ( a ), polarizability ( b ), and logarithmic relaxation time ( c ). ...

... of the shore of the Bratsk water reservoir in a zone with insufficient humidity. Among the partly flooded territories, the greatest area is occupied by forests on the shores of the Ust’-Ilim water reservoir and, to a lesser degree, by sands of the gentle low shore of the tail water of the Bratsk reservoir...

... and southeastern margins of the Siberian Platform. Gas accumulations discovered in the northeast of the Nepa–Botuoba petroleum-bearing area (PBA) in the Verkhnevilyuchanskoe oil and gas field and Vilyuiskoe–Dzherbinskoe fields are confined to the Betinche and Khoronokh sandstones. The horizon comprises the Typta...

... with the Bratsk Formation near the Angara River, whose lower part belongs to the Baksanian Horizon based on the conodont assemblage ( Byalyi and Stepanova, 2010 ; Kanygin et al., 1984a , 2007 ). Therefore, the Krivaya Luka, Chertovskaya, and Makarovo Formations should be subjected to core studies in succession...

... spread over the valleys of the above rivers and their tributaries for considerable distances ( Fig. 1 , A ). Explorations in the area of possible damming resulted in geomorphological evidence for the paleolake existence as defined terrace-like surfaces. The field works carried out along the shores...

.... The Bratsk ridge-like uplift occupies a position especially favorable to oil and gas accumulation. The Bratsk anticline, observed within the uplift, is traced in all the horizons of the section. A gas field was discovered in 1972 in the sandstones of the Parfenovo Horizon, with reserves of more than 12...

... fields. Roman numerals mark structures: I — Kureika syncline, II — Tura basin, III — Suringda uplift, IV — Baikit uplift, V — Sayan-Yenisei syncline, VI — Angara-Lena fault step, VII — Katanga saddle, VIII — Nepa-Botuobiya arch, IX — Kureika-Baklanikha ridge, X — Nizhnyaya Tunguska basin, XI — Patom...

... hydrocarbon accumulations were not proven to exist in the Sayan–Yenisei potential petroleum area. Nearby gas fields are located in the Lower Angara petroleum region and Angara–Lena petroleum area. Proven hydrocarbon reservoirs are distributed in terrigenous Vendian, carbonate Vendian and Lower, and partly...

... occurrences of migrated naphthides in caverns and fractures to large fields of stratified accumulations of allochthonous bitumoids most often transformed into kerites and anthraxalites, with the pores poorly saturated with naphthides, and giant destroyed oil pools (maltha and asphaltene accumulations...

... by the construction of the Bratsk Hydro, as that region experienced earthquakes earlier as well. The earthquakes that occurred during the first two decades of the 20th century in the region of gold fields on the Bodaibo River (Baikal-Patom Upland, south of the Siberian Paltform) make a separate group. It remains...

...Fig. 1. Petroleum accumulation zones in the south of the Lena–Tunguska province. 1 – 3 , boundaries: 1 , administrative, 2 , of Lena–Tunguska province, 3 , of petroliferous areas; 4 , petroleum accumulation zones; 5 , fields: a , oil, b , gas. Encircled digits mark petroliferous areas: 1...

... averaged information about the formation. However, it was established that the electrical conductivity of sedimentary rocks depends on the exciting frequency of the EM field, as a result of the induced-polarization (IP) effect. Since the discovery of the IP effect ( Schlumberger, 1920 ; Allaud...

... this into account and pay special attention to the leading factors. Of paramount interest is to study the coefficient of porosity ( K p ) of sedimentary rocks. This parameter reflects the geologic history of sediments. Moreover, it is related to many physical properties forming geophysical fields. Studying...

...Fig. 5. Generalized structure of Angara–Kotui Rift basin. 1 . Contours of Lena–Tunguska petroleum province. 2 . Highest-order structures. 3 . Inferred boundary of Angara-Kotui Rift basin. 4 . Oil and gas fields (1, Podkamennaya; 2, Chayanda; 3, Tympuchik; 4, Talakan; 5, Taran; 6, Verkh-Chona...

... discovered in Yakutia and Irkutsk region ( Mandel’baum et al., 1980 ), several small subeconomic plays in the Irkutsk region (Yarakta, Bratsk, Markovo, Ayan, Nepa), the developed Kovykta and Khanda ( Toropov and Man’kovskii, 2004 ) or Middle Botuobia and Upper Vilyuchansk gas fields in Yakutia. However...

... successful field tests: in the Ob estruary (northwestern Siberia), in the Verkhechonskoye oil deposit, and in the Bratsk gas-condensate deposit (both in eastern Siberia). In all three cases, the geological environment was complex (including permafrost zones or resistive rock-salt overburden). Veeken et al...