... troughs formed above the Early Triassic graben-rifts. At the platform stage, zones between rift trenches turned into large synsedimentary arched uplifts. In the platform cover, between the Koltogory-Urengoi and Agan trenches, the Nizhnevartovsk arch formed. Between the Koltogory-Urengoi and Ust’-Tym...

... of the Koltogory mesotrough and Mid-Pur trench (northern part of the Koltogory-Urengoi regional megatrench), against the background of which all positive structures adjacent to the linear depression and extending northward, formed. These are the Chasel’ka tilted megaswell, Vyngapur, Etypur, Central-Urengoi...

... — Koltogory-Urengoi, 2 — Agan, 3 — Khuduttei, 4 — Yamal, 5 — Khudosei, 6 — Rhone-Rhein, 7 — Oslo, 8 — Central, 9 — Viking, 10 — Florida, 11 — St. Lawrence, 12 — Davis strait and Buffin Sea); 8 — modern rifts (13 — Red Sea, 14 — Biscay, 15 — Baikal); 9 — mid-ocean ridges (16 — Hirondelia, 17 — Reykjanesta...

... % ) in Permian banded mudstones at a depth of 7310 m in the Tyumen’-6 superdeep borehole (central Urengoi-Koltogory trench) and in the Medvezh’ya and Lenzit fields in the Neitya basin. Late AC 3 ( R vt 0 = 4.4 % ) was recorded in the Nadym field and late AC 2 ( R vt 0 = 3.32...

... monocline (Lower Om’ area) and locally within the Tevriz and Zhuravlevo areas reach a maturity grade of medium MC 1 2 . Another MC 1 2 zone forms an N–S belt in the southern Koltogory–Nyurol’ka trench (low-medium MC 1 2 in the Nikolskaya, Razdelnaya, Rift...

... in the lower-plate stage (and in the entire platform cover). There are a number of such above-rift trenches in the Lower-Middle Jurassic complex of the West Siberian Plate: Koltogory-Urengoi, Khuduttei, Parus, Yamal, Pyakipur, Agan, Ust’-Tym, Chuzik, Khudosei, Sherkaly, etc. ( Fig. 2 , inset). Fig. 2...

... with mineralization of more than 15 g/l begins south of the Medvezh’ye and Central-Urengoi elongate megaswells, extends along the Mid-Pur elongate tilted megatrench, Koltogory-Nyurol’ka trench and the adjacent (in the west) Northern (Severny), Nizhnevartovsk, and Kaimysov arches. Farther southward the zone of waters...

... of the Kuznetsk basin, which is referred to in many publications ( Belyaev et al., 2008 ; Geology…, 1959 ; Polyansky et al., 2004 ). (2) Permian–Triassic–Jurassic rifts with most rapid subsidence and deposition in the latest Permian and Early–Middle Triassic (260–230 Ma). They are the Koltogory–Urengoi rift...

..., preservation of only dry and fat gas accumulations is possible at great depths. The same is true for the Triassic and Paleozoic sediments, in which the organic matter underwent significant thermobaric changes (grades MC 3 2 -AC 3 ). The degree of OM catagenesis increases eastward as the Urengoi trench...

... part of the Aleksandrov arch, and to the north of it within the Upper Kolik’egan structure (76–77 °C). In the Koltogory–Urengoi regional megatrench separating the Var’egan–Tagrin bench and Alexandrov arch the temperatures increase up to 90 °C and higher. In the central parts of the southern zone...

... is rich in basaltic rocks ( Yolkin et al., 2001 ). Fig. 1. Localization of parametric Maizasskaya BH-1. M-1, Maizasskaya BH-1 (Nyurolka structure-facies region). Other boreholes that stripped basalts older than 250 Ma: Tyumenskaya SDB-6 and N-1 (Nikol’skaya) BH-1—Koltogory–Urengoi rift; Kt-1, Gf-4...

... not developed here. Comparison of wave fields on the time sections obtained for profiles crossing the Yenisei–Khatanga regional trough and the Koltogory–Urengoi graben-rift indicates their fundamental differences. In the relief of the Jurassic top, the greatest depths are marked within the Bol’shaya Kheta...

... hemisyneclise, Srednepur inclined trench, Mansi syneclise and northern Koltogory–Nyurolka trench. The Nadym hemisyneclise and Khantei hemianteclise became the deepest-water zone in this part of the basin. During the Early Berriasian, deposition of deep-marine black to brownish black laminated, organic-rich...

... for large oil deposits in the Lower-Middle Jurassic strata recommended in these works were basal sand layers of the Sherkaly member in trenches and on the slopes of granite protrusions within the Minusa syneclise, Nyurol’ka, and Koltogory depression zones, and in some other regions. These predictions were...