TY - JOUR

T1 - Hydrogeochemistry of Pre-Jurassic Aquifers in West Siberia

AU - Novikov, D. A.

AU - Dultsev, F. F.

AU - Chernykh, A.

AU - Khilko, V. A.

AU - Yurchik, I. I.

AU - Sukhorukova, A. F.

N1 - Funding Information: The research was financially supported by the Project of the Fundamental Research Program No. 0331-2019-0025 “Geochemistry, Origin and Mechanisms of Formation of Groundwater Compositions in the Arctic Regions of Siberian Sedimentary Basins” and the Russian Foundation for Basic Research within the research Project No. 18-05-70074 “Arctic Resources”. Publisher Copyright: © 2020, V.S. Sobolev IGM, Siberian Branch of the RAS.

PY - 2020/11

Y1 - 2020/11

N2 - For the first time in the last 35 years, hydrogeochemical data on pre-Jurassic complexes in West Siberia have been general-ized. Groundwater and brines of Cl–Na and Cl–HCO3–Na type with total salinity (TDS) varying from 4 to 330 g/L are found to be widespread in the area under study, with the former type dominating. A detailed analysis of the hydrogeochemical data allowed us to assume the presence of three genetic groups of groundwater and brines in the hydrogeologic section: (1) sedimentogenic, (2) lithogenic (revived) and ancient infiltrogenic, and (3) condensatogenic. An integrated analysis of coefficients rNa/rCl, Ca/Cl, (Br/Cl)∙10–3, and (Sr/Cl)∙10–3 and integrated index S of brine metamorphization in the Siberian sedimentary basins has corroborated the fact that groundwater and brines in West Siberia are at the initial stage of metamorphization of their chemical composition. Groundwater and brines in the studied Siberian sedimentary basins show an increase in the degree of metamorphization (catagenetic changes) of their chemical composition in transition from the areas of igneous and metamorphic deposits at the base of the Meso–Cenozoic sedimentary cover of the young West Siberian sedimentary basin to the structures of the ancient Siberian Platform, where ultrastrong Ca–Na and Ca chloride brines are widespread.

AB - For the first time in the last 35 years, hydrogeochemical data on pre-Jurassic complexes in West Siberia have been general-ized. Groundwater and brines of Cl–Na and Cl–HCO3–Na type with total salinity (TDS) varying from 4 to 330 g/L are found to be widespread in the area under study, with the former type dominating. A detailed analysis of the hydrogeochemical data allowed us to assume the presence of three genetic groups of groundwater and brines in the hydrogeologic section: (1) sedimentogenic, (2) lithogenic (revived) and ancient infiltrogenic, and (3) condensatogenic. An integrated analysis of coefficients rNa/rCl, Ca/Cl, (Br/Cl)∙10–3, and (Sr/Cl)∙10–3 and integrated index S of brine metamorphization in the Siberian sedimentary basins has corroborated the fact that groundwater and brines in West Siberia are at the initial stage of metamorphization of their chemical composition. Groundwater and brines in the studied Siberian sedimentary basins show an increase in the degree of metamorphization (catagenetic changes) of their chemical composition in transition from the areas of igneous and metamorphic deposits at the base of the Meso–Cenozoic sedimentary cover of the young West Siberian sedimentary basin to the structures of the ancient Siberian Platform, where ultrastrong Ca–Na and Ca chloride brines are widespread.

KW - petrolewn hydrogeochemistry

KW - underground water

KW - brines

KW - degree of metamorphization

KW - genetic type

KW - Siberian sedimentary basins

KW - West Siberia

KW - YENISEI

KW - OIL

KW - petroleum hydrogeochemistry

UR - http://www.scopus.com/inward/record.url?scp=85133015664&partnerID=8YFLogxK

U2 - 10.15372/RGG2019145

DO - 10.15372/RGG2019145

M3 - Article

VL - 61

SP - 1283

EP - 1297

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 11

ER -