TY - JOUR

T1 - Geochemistry and origin of natural gas in the arctic area of West Siberia

AU - Novikov, D. A.

AU - Dultsev, F. F.

AU - Borisov, E. V.

AU - Chernykh, A. V.

AU - Fursenko, E. A.

N1 - The work was supported by the Ministry of Science and Education of the Russian Federation, No. FWZZ-2022-0014; by the Novosibirsk State University under the Priority 2030 Program.

PY - 2023/6

Y1 - 2023/6

N2 - Results obtained in the studies of gas composition in the hydrocarbon pools of the Jurassic–Cretaceous sediments in the Arctic regions of West Siberia are reported. The specific features of gas composition in hydrocarbon pools are shown. The main features of the vertical and lateral gas zoning in the Aptian–Albian–Cenomanian, Berriasian–Hauterivian and Jurassic oil and gas bearing complexes are revealed. Generalization of the data on the geochemistry of hydrocarbon gases (the features of component composition, the isotope composition of methane), along with the published data of the geological and geochemical investigation of the Arctic regions of West Siberia, allows us to consider the highly mature Triassic–Middle Jurassic coaly matter as the source of the dry hydrocarbon gases of the Lower and Middle Jurassic complex. Either the Triassic–Middle Jurassic sediments or the Upper Jurassic beds, enriched with the aquatic organic matter, could be involved in the formation of Upper Jurassic and Lower Cretaceous pools. The low-maturity terrestrial (carbonaceous) organic matter of the Cretaceous sediments generated the major amount of light-isotope gases in the Aptian–Albian–Cenomanian sediments. In addition, the source of those gases could be methane formed during oil biodegradation.

AB - Results obtained in the studies of gas composition in the hydrocarbon pools of the Jurassic–Cretaceous sediments in the Arctic regions of West Siberia are reported. The specific features of gas composition in hydrocarbon pools are shown. The main features of the vertical and lateral gas zoning in the Aptian–Albian–Cenomanian, Berriasian–Hauterivian and Jurassic oil and gas bearing complexes are revealed. Generalization of the data on the geochemistry of hydrocarbon gases (the features of component composition, the isotope composition of methane), along with the published data of the geological and geochemical investigation of the Arctic regions of West Siberia, allows us to consider the highly mature Triassic–Middle Jurassic coaly matter as the source of the dry hydrocarbon gases of the Lower and Middle Jurassic complex. Either the Triassic–Middle Jurassic sediments or the Upper Jurassic beds, enriched with the aquatic organic matter, could be involved in the formation of Upper Jurassic and Lower Cretaceous pools. The low-maturity terrestrial (carbonaceous) organic matter of the Cretaceous sediments generated the major amount of light-isotope gases in the Aptian–Albian–Cenomanian sediments. In addition, the source of those gases could be methane formed during oil biodegradation.

KW - Arctic

KW - Gas geochemistry

KW - Hydrocarbon pool

KW - Phase composition

KW - West Siberia

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85159654045&origin=inward&txGid=9750e8d7228cce28b926bd94051019d9

UR - https://www.mendeley.com/catalogue/8041d1a1-0831-3749-b5d4-2ad638bedf2a/

U2 - 10.1007/s12665-023-10973-5

DO - 10.1007/s12665-023-10973-5

M3 - Article

VL - 82

JO - Environmental Earth Sciences

JF - Environmental Earth Sciences

SN - 1866-6280

IS - 11

M1 - 261

ER -