... horizon A, 4 – by reflecting horizon B; 5 , 6 – directions of border shifts: 5 – major, 6 – subsidiary. Roman numerals designate major structures : I – Lyamin dome, II – Vyngapur megarampart, III – Yarainer-Etypur megatrough, IV – Yarainer megatrough, V – Nizhnevartovsk dome, VI – South...

..., the South-Muravlenkovo saddle and western Pyakupur trough in the east, and the southwestern flank of the Northern dome in the northeast. Oil and oil-gas-condensate deposits are discovered and explored in the Cretaceous and Upper Jurassic deposits of this area, which lies in the southwestern Nadym-Pur...

... in the Jurassic deposits of West Siberia most promising for oil and gas were under tectonic control [ 24 , 25 ]. These papers state that favorable conditions for the formation of permeable rocks exist on slopes of large positive structures and less favorable conditions, on domes. Since this point of view implies...

.... The slopes of these structures as well as the Khadyr’-Yakha, North Surgut, and Taz monoclines, the within-plate saddles, and the most contrasting bars and domes complicating the large negative structures (megadepressions and megatroughs) promise a moderate potential. The sides of large negative...

..., Vengapur and Yarainer-Etypur megabars, part of the Nadym depression, and Pyakupur-Amputin megatrough ( Fig. 1 ). The quantitative composition of the studied collection is presented in Table 1 . Fig. 1. Schematic occurrence of sampling localities of oils. 1 – boundaries of major structures; 2...

... of the Pyakupur dome. The Upper Jurassic section in the core is the most typical of this interval in West Siberia and consists of a sequence of Vasyugan, Georgiev, and Bazhenov Formations. The total thickness of the studied part of the section, combining the Callovian, Upper Jurassic and Lower Cretaceous, is 81.5...

... Bol’shaya Kheta megasyneclise. With progressive transgression, the coastal plain gradually migrated southwards along major structures such as the Pyakupur–Amputin and Middle Pur inclined megatroughs and along the northwestern termination of the Yenisei megamonoclise. Oxygen isotope data from belemnite...