ORGANIC GEOCHEMISTRY OF CARBONIFEROUS–PERMIAN DEPOSITS FROM THE ANABAR–KHATANGA OIL- AND GAS-BEARING AREA

This study is concerned with detailed geochemical investigations of organic matter in Carboniferous–Permian source rock from the Anabar–Khatanga oil- and gas-bearing area, using a representative (both by area and by section) collection of core material. The study has first shown that the organic matter of Permian deposits is polygenous throughout the section and is at different levels of thermal maturation (stages MC11-AC). It has exhausted its generative potential in most part of the section. The deposits contain paraautochthonous and allochthonous bitumens (chloroform source rock extracts) in addition to autochthonous (syngenetic) ones, which indicates intense migration processes. There are also bitumens with traces of biodegradation in Early Permian deposits from the Yuzhno-Tigyanskaya and Nordvikskaya wells.