Regularities of the Distribution of Hydrocarbon and Heteroatomic Compounds in the Dispersed Organic Matter of the Rocks in the Northern Part of West Siberia
N. A. KRASNOYAROVA, O. V. SEREBRENNIKOVA, E. V. KULCHAKOVSKAYA
Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: органическое вещество, углеводороды, гопаны, стераны, сесквитерпаны, organic matter, hydrocarbons, hopanes, steranes, sesquiterpanes
Pages: 248-255
Abstract
The rocks of Lower Cretaceous section in four exploration wells at the oil-producing fields of the Yamalo-Nenets Autonomous District were investigated. Dispersed organic matter was characterised by the composition of hydrocarbons using gas chromatography - mass spectrometry (GC-MC). Steranes, hopanes, n-alkanes and isoprenoid alkanes, naphthalenes, phenanthrenes, sesquiterpanes, dibenzothiophenes and dibenzofurans, retene, cadalene and simonellit were identified. Metalloporphyrins and perylene were determined by means of spectrophotometry. It was shown that the sediments studied were deposited under suboxidative conditions in the sedimentation basin with a significant contribution of both phytoplankton and terrestrial vegetation to the initial organic matter. Sedimentation proceeded near the coastline of the sea or in a coastal water body, which was periodically flooded by the sea. The thermal maturity of the organic matter corresponds to the major zone of oil formation.
DOI: 10.15372/CSD2020227
|
