Application of spatial offlap break trajectory analysis of the North Chukchi Trough clinoforms for hydrocarbon evaluation

UDK: 553.98
DOI: 10.24887/0028-2448-2021-2-40-45
Key words: Arctic, shelf, Chukchi Sea, clinoforms, sequence stratigraphy, oil and gas potential
Authors: M.V. Skaryatin (RN-Exploration LLC, RF, Moscow; Gubkin University, RF, Moscow), V.N. Stavitskaya (Scientific Arctic Centre LLC, RF, Moscow), I.V. Mazaeva (RN-Exploration LLC, RF, Moscow), S.A. Zaytseva (RN-Exploration LLC, RF, Moscow), A.A. Batalova (Scientific Arctic Centre LLC, RF, Moscow), R.Kh. Moiseeva (Scientific Arctic Centre LLC, RF, Moscow), E.V. Vinnikovskaya (RN-Exploration LLC, RF, Moscow), E.A. Bulgakova (RN-Exploration LLC, RF, Moscow), N.A. Malyshev (Rosneft Oil Company, RF, Moscow), V.E. Verzhbitskiy (Rosneft Oil Company, RF, Moscow), V.V. Obmetko (Rosneft Oil Company, RF, Moscow), A.A. Borodulin (Rosneft Oil Company, RF, Moscow)

The North Chukchi Trough depositional history was largely written by changes in direction of sedimentary influx. In the Aptian-Cenomanian the sediments were transported from the New Siberia – Chukotka fold and thrust belt highs. The Cenomanian extension led to the transgression. From Cenomanian to middle Paleocene the North Chukchi Trough has been filling while extension was switching to compression. By the middle Paleocene the continental palaeo-shelf was formed and then flooded due to its interior extension and subsidence. Since then and until the middle Eocene the clinothemes were deposited in a highly dissected topography during sea level high stand and greenhouse period. From the middle Eocene until Oligocene the low systems tract deposits were dominantly forming. In the latest Oligocene – beginning of Miocene the warming begun and the sea level was steadily rising, while the clinothems were progressing into the North Chukchi Trough and their heights were increasing. In the beginning of the Pliocene the Bering Strait opening took place along with a vast transgression in the region. On the basis of the sequence stratigraphic analysis, the petroleum system elements were predicted in the North Chukchi Trough sedimentary cover. Fluvial-deltaic sandstone reservoirs are expected in the clinothem topsets close to the offlap break in the Campanian-Danian, Lutetian, and Rupelian-Chattian deposits. Deep-water sandstone reservoirs are developed in the clinothem bottomsets of Campanian-Danian, Lutetian, Rupelian-Chattian, and Langhian deposits. Source rocks are prognosed in the Cenomanian-Turonian, Thanetian, Chattian-Aquitanian, and Pliocene deposits. Traps are interpreted to be mostly stratigraphic, while combined are rare. Among structural traps there are rollover and rootless folds.


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