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UDC 550.4:552.578.2(571.1)
ORGANIC GEOCHEMISTRY OF AQUABITUMOIDS OF DISPERSION HALOS OF OIL AND GAS ACCUMULATIONS WITHIN THE WEST SIBERIAN SEDIMENTARY BASIN
Results of aquabitumoid (AB) investigations in scattering ranges of oil components from accumulations and geochemical anomalies in migration paths (AB of second system) are stated. As it is shown in natural objects, the content and composition of dissipative bitumoids depend neither on total water salinity nor on their mineral composition. This is largely controlled by an oil genotype, its size and thermobaric conditions, as well as by the distance from accumulation, lithological character of rocks, enclosing accumulation, etc. The genetic unity between aquabitumoid families of the second system and corresponding oil families is determined at molecular level, and hence the composition of AB of the second system can predict not only possible accumulations, but their genotype. The study of dissipative AB content and their composition, in some cases, allow suggesting the presence of water unloading from some aquifer system to another, destruction, and possibly accumulation re-formation. The findings prove existence and great scale of oil components dispersion from accumulations. Obtained data on geochemistry of dissipative AB can be used, on the one hand, in evaluation of petroleum potential of geological targets in the basin and, on the other hand, in solving of a number of controversial questions in the theory of oil origin.
Key words: aquabitumoids, system, family, hydrocarbons, biomarkers. |
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