Structural styles (or structural paragenesis in Russian literature) in the sedimentary cover result from tectonic processes that took place during the basin evolution. Hydrocarbon traps within regions with a single structural style can share similar structure and tectonic development features. This, in turn, may determine the commonality of risk factors such as the retention, vertical migration etc. In addition, traps of different structural styles can vary significantly in size, hydrocarbon resources compactness, and reservoir structural heterogeneity level. We identified and mapped areas characterized by various structural styles in the Russian Chukchi Sea sedimentary cover. These include areas of predominant basement draping, extension, transtension, compression, transpression, and mobilized salt- and shale related deformations. Among extensional structural styles, we separated thin-skinned deformations from thick-skinned ones. Identified structural styles analysis resulted in hydrocarbon plays (structural and combined trap families) definition. The least geological risks determined by structural factors can be expected in plays associated with inversion structures across the Chukchi monocline, basement drapes across the Chukchi monocline and the South Chukchi trough, and in plays related to the North Chukchi trough thin-skinned extension. These plays definition allow us to narrow focus of further works on hydrocarbon evaluation of the Chukchi Sea sedimentary cover.
1. Luk'yanov A.V., Shcherba I.G., Parageneticheskiy analiz struktur kak osnova tektonicheskogo rayonirovaniya i sostavleniya srednemasshtabnykh strukturnykh kart skladchatykh oblastey (Paragenetic analysis of structures as a basis for tectonic zoning and compiling medium-scale structural maps of folded areas), Collected papers “Tektonika Sibiri” (Tectonics of Siberia), 1972, V. 5, pp. 15–24.
2. Harding T.P., Lowell J.D., Structural styles, their plate-tectonic habitats, and hydrocarbon traps in petroleum provinces, AAPG Bulletin, 1979, V. 63, no. 7, pp. 1016–1058, DOI:10.2110/pec.85.37.0051
3. Mazarovich A.O., Sokolov S.Y., Tectonic subdivision of the Chukchi and East Siberian seas, Russian Journal of Earth Sciences, 2003, V. 5, no. 3, pp. 185–202, DOI:10.2205/2003ES000120
4. Ikhsanov B.I., Pozdnemezozoyskie i kaynozoyskie deformatsii osadochnykh basseynov akvatorii Chukotskogo morya (Pozdnemezozoyskie i kaynozoyskie deformatsii osadochnykh basseynov akvatorii Chukotskogo morya): thesis of candidate of geological and mineralogical science, Moscow, 2014.
5. Nikishin A.M., Malyshev N.A., Petrov E.I., Geological structure and history of the Arctic Ocean, Housten: EAGE Publications bv, 2014, 88 p.
6. Malyshev N.A., Obmetko V.V., Borodulin A.A., Hydrocarbon potential of the Eastern Arctic sedimentary basins (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneft'”, 2010, no. 1, pp. 20–28.
7. Verzhbitskiy V.E., Malysheva S.V., Sokolov S.D. et al., Problems of tectonics and petroleum potential of Russian sector of the Chukchi sea (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 12, pp. 8-13.
8. Verzhbitsky V.E., Sokolov S.D., Frantzen E.M. et al., The South Chukchi sedimentary basin (Chukchi sea, Russian Arctic): Age, structural pattern, and hydrocarbon potential, Tectonics and sedimentation: Implications for petroleum systems, 2012, V. 100, pp. 267–290, DOI:10.1306/13351557M1003534
9. Grantz A., Eittreim S., Geology and physiography of the continental margin north of Alaska and implications for the origin of the Canada basin, California, U.S. Geological Survey, Menlo Park, 1979, DOI:10.3133/ofr79288
10. Lawver L.A., Scotese C.R., A review of tectonic models for the evolution of the Canada Basin, The Arctic Ocean Region. The Geology of North America, Geological Society of America, 1990, pp. 593–618, DOI:10.1130/DNAG-GNA-L.593
11. Homza T.X., Bergman S.C., A geologic Interpretation of the Chukchi Sea Petroleum Province: Offshore Alaska, USA, AAPG Memoir, 2019, V. 119, https://doi.org/10.1306/AAPG11912. Skaryatin M.V.,