Abstract

The investigation of the dispersed organic matter of the rocks in the Ust’-Maiskaya wildcat area was conducted. Data on the features of dispersed organic matter composition in the range of 2868.731-3057.68 m are presented. Alkanes, mono-, bi-, tri-, tetra- and pentacyclic arenes, bi-, tri-, tetra- and pentacyclanes, tetracyclic naphthenoaromatic hydrocarbons, dibenzothiophenes have been identified among hydrocarbons studied by means of gas chromatography - mass-spectrometry. Perylene and traces of nickel metalloporphyrins and perylene were also determined by means of spectrophotometry. It is shown that the initial organic matter was formed under the conditions of reduction and suboxidation, with a significant contribution from both terrestrial vegetation and phytoplankton. The presence of nickel porphyrin and perylene complexes in some sections of the log suggests the shallowness of the sedimentation basin and the proximity of the coastline during OM accumulation. The calculated vitrinite reflectance indicates that the differences observed for the MK2 stage of catagenesis correspond to the main zone of oil generation.

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