Composition of fluid inclusions by Raman spectroscopy in Paleozoic carbonate rocks of severo8ostaninsk field, western Siberia

Результат исследований: Материалы для журналаСтатья


The relevance of the research is related to the possibility of detecting hydrocarbon deposits in the Paleozoic carbonate sediments of Western Siberia and increasing the oil and gas potential of the region. The aim of the research is to determine the composition of gas8liquid inclusions in dolomitized carbonate rocks of Severo8Ostaninsk oil field using Raman spectroscopy, which will allow clarifying information on fluid composition and conditions of formation of secondary dolomites in limestone, due to their association with oil and gas accumulation zones. The research object is the carbonate deposits in the roof part of the pre8Jurassic basement in Severo8Ostaninsk area of Western Siberia. Methods: petrographic (crystal optics), Raman spectroscopy and UV photoluminescence analysis. Results. The well section of the Severo8Ostaninsk field is composed of organogenic8oolitic limestone and dolomite of varying grain size. The petrographic study of carbonate rocks allowed distinguishing main phases of dolomitization in limestones: primary pelito8 morphic material composing rock matrix together with calcite; secondary crystalline dolomite fulfilling fractures; and dolomite forming partially regular rhombohedral crystals. On a specific material, it was shown that using the Raman spectroscopy method, it was possible to detect in the gas8liquid inclusions of secondary dolomites spectral peaks at 1187, 1243, 1348 cm-1typical of kerogen8containing orga8 nic matter, and peaks at 1525 and 1597 cm-1 characteristics of highly disordered carbon8containing material. The origin of these peaks are generated by Caromatic-Calkyl vibrations; aromatic ethers, C-C and C-H in aromatic rings. The contribution from C=O vibration was esta8 blished as well. The presence of gas phases in the inclusions suggests that secondary dolomite in carbonate rocks was formed in the pres8 ence of carbonaceous matter dissolved in the rock8forming fluid.

Язык оригиналаАнглийский
Страницы (с-по)187-203
Число страниц17
ЖурналBulletin of the Tomsk Polytechnic University, Geo Assets Engineering
Номер выпуска3
СостояниеОпубликовано - 1 янв 2019

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology
  • Waste Management and Disposal
  • Economic Geology
  • Management, Monitoring, Policy and Law

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