Розглянуто можливість використання абіогенної теорії походження родовищ
вуглеводнів для побудови газової колони (частина верхньої мантії Землі, де генеруються, концентруються вуглеводневі гази та відбуваються їхні локальні викиди,
які сприяють утворенню родовищ вуглеводнів). У Зовнішній тектонічній зоні Передкарпатського прогину докайнозойських порід виділено Коханівську кільцеву структуру, у межах якої ймовірне виявлення родовищ газу.
Last years authors of the article were developing statements of the abiogenic theory
of hydrocarbons genesis. Numbers of their articles concerned the problems of hydrocarbons formation in different geological structures of Ukraine and joint regions. Basement
point of the author’s version of the theory is an idea about formation of gas column during
different tectonic epochs and establishing within their zones of hydrocarbons generation
and concentration of hydrocarbon various phases. To create main initial aspects of the
practical geological model of hydrocarbons formation and distribution of their fields, large
geological structures (Donbas and Karpinskiy’s lineament) were used.
According to authors’ geological models, gas column is a part of upper mantle and
low levels of the Earth crust where hydrocarbon gases have been generated, concentrated
and thrown out as a source of hydrocarbons fields. Vertical section of the gas column
stretches from asthenospheric surface up to sedimentary sequence. It is divided into some
zones with specific PT-conditions, which reflect formation of different hydrocarbons phases. Gas field and its halo, which is located in upper part, are two main components of the
gas column. Authors established system of geological, geophysical, geochemical and isotopic marks to determine depth of the various zones and to estimate composition of their
hydrocarbons.
Noted statements of the abiogenic theory of hydrocarbon field genesis are discussed
in this paper as well as creation of the gas column for the Inner tectonic zone of the Carpathian Foredeep. Authors established gas column within the Kokhanivka rim structure,
which is located in the depression. Seismic and thermometry data and information on
structure and gas distribution within sedimentary sequence are involved for this purpose.
To determine the gas column of the Kokhanivka structure, depths of marks, limiting zones
of formation and concentration of gas, main features of the sedimentary sequence, which
contain characteristic of the halo, distribution of oil and gas within the halo, have been
used.
As a result of this investigation, the Kokhanivka rim structure is established, where
possibly large gas field is located in sequence of the PreMesozoic rocks. Most possible the
gas field is connected to upper part of the Jurassic rocks in centre of the structure, where
fluid proof Sarmatian horizon is developed. Gas-bearing horizon can be related here to
carbonate-terrigenous sediments of the Upper Jurassic, and to similar Silurian sediments
at Poland. Thickness of the gas-bearing sequence is up to 500 m. Probably, within Kokhanivka structure we can meet not only main gas field, but a number of others also, joint
to it, at the depths of 2000–3500 m.
