On the Issue of Dispersed Organic Matter Differentiation in the Upper Devonian-Tournaisian Strata at the Perm Krai

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Abstract

One of the aspects of the formation of the hydrocarbon potential of the main oil and gas source rock (OGSR) of Upper Devonian-Tournaisian age in the context of the sedimentary cover of the Perm Krai was considered. The subject of study was the basic chemical and bituminological characteristics of dispersed organic matter (DOM) of source rocks. The sample of parameters collected to study the thickness contained more than 4300 definitions. The main goal of the study was to differentiate the dispersed rocks organic matter depending on the distribution of bitumen coefficient values and the enrichment degree of strata with organic carbon. According to the conditions of formation, the Upper Devonian-Tournaisian rock was characterized by the maximum development in this territory of favorable geochemical facies, under the conditions of which the DOM transformation into petroleum hydrocarbons occurs. Statistical analysis of the average values of chemical and bituminological parameters confirmed the syngenetic nature of the DOM to the containing rock with a high degree of transformation and enrichment in migratory bitumens, which allowed considering this strata to generate oil and gas and ensured the formation of the oil and gas content. Further, based on fundamental research, in particular the Uspensky-Vassoevich relationship, the differentiation of DOM of the Devonian-Tournaisian formation into syngenetic, mixed and epigenetic was for the first time quantitatively substantiated. By studying the sample using regression and discriminant analysis methods, it was shown that the identified types of DOM were statistically different in the ratio of the parameters Corg and β, which proved their relationship to bitumen of different types. For each identified type of DOM within the stratigraphic units of the main OGSR, different types of relationships between the studied parameters Corg and β were also statistically established. As a result of the research, the author established the individual percentage distribution of DOM types for each horizon of the Upper Devonian-Tournaisian oil and gas source rock and statistically proved their difference in the ratio of Corg and β, which characterized the individual intensity and direction of converting bitumen into micro-oil. It was established that in this sequence the Domanik horizon itself was characterized by the widest development of epigenetic bitumen.

Keywords

chemical and bituminological characteristicsstatistical data analysisUpper Devonian-Tournaisian stratadispersed organic matter transformationoil-generating potentialdispersed organic matter differentiationDomanik horizonepigenetic biumoids

Bibliography

  1. 1.Stupakova A.V., Fadeeva N.P., Kalmykov G.A. Poiskovye kriterii nefti i gaza v domanikovykh oltozheniiakh Volgo-Ural'skogo basseina [Search criteria for oil and gas in Domanic deposits of the Volga-Ural basin]. Georesursy, 2015, no. 2(61), pp. 77-86. Scholar
  2. 2.Burshtein L.M., Zhidkova L.V., Kontorovich A.E., Melenevskii V.N. Model' katageneza organicheskogo veshchestva (na primere bazhenovskoi svity) [Model of organic matter catagenesis (on the example of the Bazhenov Formation)]. Geologiia i geofizika, 1997, pp. 1070-1078. Scholar
  3. 3.Magoon L.B., Dow W.G. The petroleum system - from source to trap. AAG memoir 60, 2012, 312 p. DOI: 10.1306/M60585 Scholar
  4. 4.Hantschel Th., Kauerauf A.I. Fundamentals of Basin and Petroleum Systems Modeling. Springer-Verlag. Berlin: Heidelberg, 2009, 482 p. Scholar
  5. 5.Merson M.E., Voevodkin V.L., Galkin V.I. K voprosu postroeniia geologo-matematicheskikh modelei sootnoshenii promyshlennykh zapasov i resursov dlia territorii Permskoi oblasti [On the issue of constructing geological and mathematical models of the relationship between commercial reserves and resources for the Perm region]. Geologija, geofizika i razrabotka neftianykh i gazovykh mestorozhdenii, 2005, no. 9-10, pp. 15-18. Scholar
  6. 6.Galkin V.I., Kozlova I.A., Melkishev O.A., Shadrina M.A. Geokhimicheskie pokazateli ROV porod kak kriterii otsenki perspektiv neftegazonosnosti [Geochemical indicators of rock DOM as criteria for assessing oil and gas potential prospects]. Neftepromyslovoe delo, 2013, no. 9, pp. 28-31. Scholar
  7. 7.Voevodkin V.L., Rastegaev A.V., Galkin V.I. Issledovanie sootnoshenii mezhdu resursami i zapasami nefti v predelakh iugo-vostochnogo bar'ernogo rifa Kamsko- Kine'iskoi sistemy progibov (KKSP) [Study of the relationship between resources and oil reserves within the southeastern barrier reef of the Kama-Kinel trough system]. Geologija, geofizika i razrabotka neftianykh i gazovykh mestorozhdenii, 2005, no. 9-10, pp. 9-12. Scholar
  8. 8.Galkin V.I., Kozlova I.A. Razrabotka veroiatnostno-statisticheskikh regional'no-zonal'nykh modelei prognoza neftegazonosnosti po dannym geokhimicheskikh issledovanii verkhnedevonskikh karbonatnykh oltozhenii [Development of probabilistic-statistical regional-zoning models of oil and gas potential prediction based on the data of geochemical studies of the Upper Devonian carbonate deposits]. Geologija, geofizika i razrabotka neftianykh i gazovykh mestorozhdenii, 2016, no. 6, pp. 40-45. Scholar
  9. 9.Krivoshchekov S.N., Kozlova I.A., Sannikov I.V. Otsenka perspektiv neftegazonosnosti zapadnoi chasti Solikamskoi depressii na osnove geokhimicheskikh i geodinamicheskikh dannykh [Estimate of the petroleum potential of the western Solikamsk depression based on geochemical and geodynamic data]. Neftianoe khoziaistvo, 2014, no. 6, pp. 12-15. Scholar
  10. 10.Punanova S.A. Mikroelementy neftei, ikh ispol'zovanie pri geokhimicheskikh issledovaniiakh i izuchenii protsessov migratsii [Trace elements of oils, their use in geochemical research and the study of migration processes]. Moscow: Nedra, 1974, 215 p. Scholar
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Article information

Published
31 March 2024
Issue date
31 March 2024
Issue
Vol. 24, No. 1 (2024)
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