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EXPERIENCE OF GEOLOGICAL MAPPING OF RUPTURE DISLOCATIONS IN THE BASEMENT AND COVER OF THE WEST-SIBERIAN PLATE (KHMAO, THE VAKH LOWER CURRENT)

V. I. Tikhonenko

Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia

In the process of drawing up a GGK-200/2 map set, a network of multidirectional rectilinear rupture dislocations outcropping and interpreted as subvertical shear fractures associated with horizontal shifts in the basement and cover of the West Siberian Plate. These shear fractures are a reflection of structureforming faults. They correspond to the structure details of both the plate’s basement and cover and influence processes of migration, accumulation and conservation (preservation) of hydrocarbon deposits. The shears are shown graphically at four hypsometric levels of: the plate’s basement surface (seismic reflecting horizon «A»); the bottom of the Bazhenovskaya Formation (seismic reflecting horizon «B»); the bottom of the Kuznetsovskaya Formation (seismic reflecting horizon «G»); the modern relief surface. The suggestion is made that multidirectional and uneven-aged rupture dislocations were constantly updated under the influence of rotational latitudinal and longitude stresses in the crust of the non-uniformly rotating Earth. Evidence of their activation at the platform stage of the area’s development, including the Quarternary, allows us to consider these systems of faults as long-lived ones.

Keywords: West Siberia, the Vakh, basement, cover, faults, oil-and-gas content.

DOI 10.20403/2078-0575-2018-3-3-12