Geochemical Characteristics of the Organic Matter of the Riphean Deposits of the Ust’-Mayskaya Parametric Well for Assessment of the Oil and Gas Potential
N. A. KRASNOYAROVA, O. V. SEREBRENNIKOVA, P. B. KADYCHAGOV
Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk ,Russia
Keywords: dispersed organic matter, hydrocarbons, heteroorganic compounds
Pages: 200-205
Abstract
Investigation of the dispersed organic matter of the rocks at the Ust’-Maiskaya wildcat area was carried out. The 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 were also determined spectrophotometrically. It is shown that the initial organic matter was formed under the conditions of reduction and suboxidation, with a significant contribution from both the 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 the period of 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.
DOI: 10.15372/CSD2023456
EDN: NOWSDL
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