Prospects for oil and gas potential of the zone of abnormally high reservoir pressures (AVPD) in the Yamalo-Nenets Autonomous Okrug, taking into account deep fluid dynamics

In Western Siberia, the zone of abnormally high fluid pressures (AVFD)covers an area of more than 500 thousand km2 in the north of the basin. It begins with a clay cover above the Achimov stratum of sandy-silt strata of the Neocomian, covers the Achimov stratum, the upper - Lower Jurassic, Triassic and partially - Paleozoic and is subject to tectonic control, which indicates the deep origin of this phenomenon. Gas-pressurized, or gas-dynamic, The AVFD theory, proposed by K.A. Anikiev in the 70s of the XX century, makes it possible to assess the prospects for the oil and gas potential of the AVFD zone more highly than is customary. An analysis of the results of previous exploration work on the deep horizons of the Yamalo-Nenets Autonomous Okrug shows that their relatively low efficiency (50-60%) is associated with an insufficiently high quality of well operations, primarily cementing, which is also due to the influence of AVFD. In all wells drilled to deep horizons, direct signs of oil and gas potential were obtained and cementing defects were established. It is concluded that deep fluid-dynamic processes (active, pressure degassing of the Earth's interior) are responsible both for the saturation of reservoir rocks with hydrocarbons (hydrocarbons) and for the dynamics of their filling (ultrahigh pressures and velocities), which determines the main characteristics of reservoir rocks. Knowledge of the deep source of hydrocarbons will not only fundamentally increase the resource base of the AVFD zone, but will also require a revision of ideas about the formation and structure of hydrocarbon deposits in this zone and the petrophysical justification of their models. However, in order to realize the unique UB-potential of the AVFD zone, it is necessary to first of all improve the quality of constructionand deep wells and their informativeness.