Abstract: Isotope-Geochemical Modeling of the Ukrainian Petroliferous Basins

LUKIN, ALEXANDER

Oil and gas-bearing basins (OGB) of Ukraine are represented by essentially different tectono-geodynamic types differ distinctly by history of development, feature of geological structure and habitat of petroleum. The main types of source rocks for the Dnieper-Donets paleorift basin are Late Devonian domanikites, thick black shales of intermediate Devonian-Carboniferous series and Middle Visean euxinic-like facies. Besides, there are isotope-geochemical and other reasons for oil-gas-generating role of black shales and coaliferous measures of Late Visean, Serpukhovian and Moscovian age in the basin. The main intervals of hydrocarbon generation of the Dnieper-Donets basin are connected with hypogenetic-allogenic processes of Late Carboniferous - Early Permian, pre-Triassic, pre-Middle Jurassic, Late Cretaceous, pre-Paleogene, neotectonic and recent tectonic phases.

Rocks with increased organic matter content of the West Ukrainian OGB are connected with Oligocene (Menilite black shales), Lower Cretaceous (Spassky ones). The most powerful phases of oil generation coincided with tectogenesis on the Cretaceous/Paleogene, Paleogene/Miocene and Miocene/Pliocene boundaries.

Vast Azov-Black Sea OGB is least explored. Here Oligocene (Maikopian) black shales with increased content of organic matter have not realized their great (according to experimental data on HC-mobilization while heating of Maikopian clays) source potential. Multiphased character of naphtidogenesis, their obvious connection with hypogenetic allogenesis and leading role of post-Paleogene phases are established here also.

Liquid and gaseous HC of the Ukrainian basins show marked isotope-geochemical (C, S, H) distinctions connected with geodynamic type of OGB and initial differences of source rock organic matter.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria