Abstract
Sedimentary basins of northern Siberia regions have a unique hydrogeology. Transitive type of the section (salt-free to salt-laden sediments) changes from the Yamal Peninsula in West Siberia through the regional Yenisei-Khatanga basin to the Anabar-Laptev basin, where salt plugs are located. Synthesis of vast factual data of the West Siberian basin and the Northern Siberian Craton has allowed specifying features of regional hydrogeochemical patterns, nature of local and zonal anomalies in hydrogeochemistry, and establishing their spatial correlation with oil-and-gas occurrences. The West Siberian megabasin has sulfate-free brackish groundwaters and brines (as high as 70 g/L in the study area), elevated concentrations of dissolved OM and hydrocarbon gases in the formation waters of a Mesozoic hydrogeological unit. The Anabar-Laptev basin studied brines have sodium chloride composition with the TDS from 52.3 to 350 g/L. Comparative analysis of groundwaters and brines in Northern Siberia has revealed a group of sodium chloride samples with the TDS > 250 g/L, being the genetic type of brines originating from rock salt leaching within the salt-cores. Composition of brines has varied dramatically with increasing of their evolution. The most evolved calcium brines (Ca/Cl ratio up to 0.33) were detected in the Vendian-Cambrian and Riphean aquifer systems in the Anabar-Laptev basin and Cambrian sediments of the Anabar Shield (Ca/Cl is 0.50-0.65). Mesozoic groundwaters and brines of West Siberia have been only in the beginning of their chemical evolution.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
