INFLUENCE OF THE ASPHALT-RESINOUS COMPONENT FROM BITUMEN ON THE PYROLYSIS DATA IN TERRIGENOUS ORGANIC MATTER OF THE UPPER PALEOZOIC COMPLEX OF THE VILYUI HEMISYNECLISE

This work is devoted to the study of the asphalt-resinous component (ARC) from bitumens influence on the terrestrial organic matter (OM) residual generation potential (HI). Samples of Permian rocks were analyzed in that study. They were obtained from well Sred-nevilyuiskaya-27 (Vilyui hemisyneclise, Eastern Siberia) in the depth range of 3370–4370 m. The pyrolysis peak S2 was divided into two parts along the temperature boundaries: S2 '– 300–400 °C (asphalt-resinous component) and the main S2 peak – 400–650 °C (kerogen). The con-tribution of ARC to the values of the hydrogen index (HI) was calculated, and the influence of catagenesis on the ratio of the S2 'and S2 peaks was traced. An overestimation of the HI index of kerogen due to heterogeneous compounds of bitumen was established up to 20 % at the late stages of mesocatagenesis.