Oil and gas potential prospects of the Ordovician-Carboniferous deposits for West Taimyr under limited data conditions

Background. The interest of many oil companies is focused on the under-discovered but highly potential prospects of arctic regions of the Enisey-Khatanga oil and gas bearing region. There are practically no other comparable oil and gas bearing regions within Russian onshore. The interest of present paper covers the area of twelve Zapadno-Taimyrsky licenses and six Nizhnepurinsky licenses which Gazprom Neft owns with opportunity for prospecting and exploration surveys on the right side of the Enisey bay. Company owns two other license areas named Leskinsky and Pukhutsayakhsky on the left side of the Enisey bay where the exploration program
has been realized since 2019.
Aim of present research is to assess the prospects of oil and gas potential of the Paleozoic series of the West Taimyr that represented by Ordovician, Silurian, Devonian and Carboniferous deposits based on new geological data.
Materials and methods. The assessment of the Paleozoic resources prospects was held based on the result of pre-stack time migration reprocessing of the entire set of available 2D seismic surveys, drilling results of first exploration well, results of geochemistry data analysis, core data description and petrophysical results of laboratory test accomplished with paleoreconstructions and other regional data considered as primary methods of research.
Results. Complex approach for available geological data analysis makes possible to identify main oil and gas prospects of the Paleozoic series and highlight the driver of the project. All elements of petroleum system were defined and estimated for each complex such as a potential source rock, the intervals of carbonate reservoirs, regional and local seals, traps and preservation. The influence of dissolution, fracturing and other diagenetic processes on the formation of void space were evaluated.

1. Vernikovsky V.A. Geodynamic evolution of the Taimyr folded region. Novosibirsk: Publishing House of SB RAS, SIC OIGGM, 1996, 203 p. (In Russ.)

2. Morozov A.F., Petrov O.V. Geological map of Russia and adjacent water areas, 1:2 500 000, 2004. (In Russ.)

3. Mayolle S., Soliva R., Caniven Y., Wibberley C., Ballas G., Milesi G., Dominguez S. Scaling of fault damage zones in carbonate rocks. Journal of Structural Geology. 2019, no. 124, pp. 35–50.

4. Vilesov A.P., Ershova V.B., Solovyeva A.D. Lithological and sedimentological characteristics of the Paleozoic of the West Taimyr potential oil and gas bearing area (according to drilling data). PRONEFT. Professionally about oil. 2022, no. 4 (In press) (In Russ.).

5. Scotese C.R., Boucot A.J., and Chen Xu Atlas of Phanerozoic Climatic Zones (Mollweide Projection). PALEOMAP Project PaleoAtlas for ArcGIS, PALEOMAP Project, Evanston, IL, 2014, vol. 1–6.

6. Vilesov A.P. Typification of multi–scale carbonate sedimentary bodies of the Upper Devonian — reaching a new level of geological exploration in the Volga–Ural oil and gas province. Oil industry. 2021, no. 11, pp. 76–81. (In Russ.). https://doi.org/10.24887/0028-2448-2021-11-76-81

7. Zhemchugova V.A. Natural reservoirs in the carbonate formations of the Pechora oil and gas basin. Moscow Publishing House of the Moscow State University, 2002, 243 p. (In Russ.)

8. Balsamo F., Clemenzi L., Storti F., Solum J., Taberner C. Tectonic control on vein attributes and deformation intensity in fault damage zones affecting Natih platform carbonates, Jabal Qusaybah, North Oman. Journal of Structural Geology. 2019, no. 122, pp. 38–57.

9. Lowell J.D. Structural styles in petroleum exploration. Tulsa: Oil & Gas Consultants, 1990, 492 p.

10. Webby B. Patterns of Ordovician Reef Development. Phanerozoic reef patterns (editors Kiessling W., Flugel E., Golonka J.). Tulsa, 2002, pp