Combining pyrolysis and molecular parameters to improve reliability of assessment of organic matter maturity level in Bazhenov formation (north-western part of Khanty-Mansi autonomous okrug - Yugra)

Based on the results of pyrolysis and gas chromatography-mass spectrometry studies of core samples and chloroform extracts, high correlations of a number of pyrolysis and molecular parameters were revealed for Organic Matter of the Bazhenov Formation and its stratigraphic analogue - the Lower Tutleim Formation. Core was taken from 7 wells of the Krasnoleninsky and 2 wells of the Frolovsky oil and gas regions. This work made it possible to improve reliability of the assessment of Organic Matter thermal maturity level. The obtained results show the advantage of combining pyrolysis and molecular parameters in geochemical studies when it is possible to correct some parameters using others. This allows the most reliable determination of Organic Matter genetic and maturity characteristics for the correct reconstruction of Organic Matter transformation history and further use the obtained data, for example, in basin modelling