Quasi-three-dimensional modelling of the Jurassic-Cretaceous sediments hydrogeochemical conditions in the central part of the West Siberian megabasin

Курчиков, А.Р.; Plavnik, A.G.; Itskovich, Marina V.

doi:10.1016/j.apgeochem.2019.104433

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…We evaluated the literature reports in which the location of disjunctive faults in the oilfield basement was delineated by geophysical survey data [4,[6][7][8], and we came to the conclusion that there is currently no univocal picture of the fault grid location. The subjectivity of one of the up-to-date delineation methods for disjunctive faults-the lineament analysis-is also indicated by other authors [30,31]. At the same time, these authors discovered by the lineament analysis of the Koltogorsk-Tolka zone of the West Siberian megabasin and adjacent territories that there is a relationship between the salinity distribution across all of the aquifer systems and the block structure of the sedimentary cover.…”

Section: Geologic-hydrogeologic Features Of the Talinskoye Oilfieldmentioning

confidence: 89%

Causes of Variability in Groundwater Salinity of the Lower Jurassic Sediments in the Talinskoye Oilfield of West Siberia

Abdrashitov

Kadyrov

2022

Sustainability

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This study aimed to identify the nature of variable groundwater salinity from the standpoint of whether natural or man-caused factors have a dominant impact on the modern salinity range of the Lower Jurassic sediments in the Talinskoye oilfield of West Siberia in Russia. As of now, the salinity values of reservoir waters vary from 3.7 to 15.3 g/dm3, with an average of 8.9 g/dm3. Petroleum hydrocarbons are extracted at the oilfield from the Lower Jurassic sediments. The volume of overlying sediments’ waters injected into the pay zones to maintain the formation pressure was more than 8960.3 thousand m3 between 2014 and 2021. In this regard, it is necessary to establish whether anthropogenic factors are critical for the variability in groundwater salinity of the Lower Jurassic sediments, or the complex geologic and hydrogeologic conditions are determinant factors affecting the salinity variability. To achieve this objective, we evaluated the genetic coefficients of various types of waters (inclusive of injected waters) which could contribute to the variability in groundwaters with varying quantities and ratios. The resultant genetic coefficients were compared with those of reservoir waters of the Lower Jurassic hydrogeological complex. This allowed for the conclusion that the major factors currently affecting the variable salinity of the reservoir waters of the Lower Jurassic complex are natural ones. We also assessed the relationship between the groundwater salinity values of the complex under study and basic parameters of the geologic setting, such as porosity, formation pressure, modern temperature and paleotemperature of the basement, and basement depth of burial. A tight association was found between the salinity values and porosity of the sediments (R = 0.87), and a very tight connection between the salinity and formation pressure (R = 0.91), which, we believe, also evidences that natural factors have a dominant effect on the variability in groundwater salinity. The variability in the modern salinity values of the reservoir waters of the complex in question ensues from the continental conditions of the groundwater genesis, expelled-water exchange processes (ingress of the pore waters expelled from argillaceous deposits as geostatic pressure rises), and the intrusion of abyssal fluids along the basement fractures.

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Section: Geologic-hydrogeologic Features Of the Talinskoye Oilfieldmentioning

confidence: 89%

Causes of Variability in Groundwater Salinity of the Lower Jurassic Sediments in the Talinskoye Oilfield of West Siberia

Abdrashitov

Kadyrov

2022

Sustainability

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Hydrogeochemistry of authigenic mineral formation in Upper Jurassic sediments (the Nadym-Taz interfluve area, Arctic regions of Western Siberia)

Новиков

2020

Applied Geochemistry

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Preface – Special issue applied geochemistry: Innovative methods for characterizing evolution and budgets in water/rock systems: A tribute to Tom Bullen and Stepan Shvartsev

Millot

Shouakar-Stash

Zuddas

et al. 2021

Applied Geochemistry

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Quasi-three-dimensional modelling of the Jurassic-Cretaceous sediments hydrogeochemical conditions in the central part of the West Siberian megabasin

Cited by 5 publications

References 17 publications

Causes of Variability in Groundwater Salinity of the Lower Jurassic Sediments in the Talinskoye Oilfield of West Siberia

Causes of Variability in Groundwater Salinity of the Lower Jurassic Sediments in the Talinskoye Oilfield of West Siberia

Hydrogeochemistry of authigenic mineral formation in Upper Jurassic sediments (the Nadym-Taz interfluve area, Arctic regions of Western Siberia)

Preface – Special issue applied geochemistry: Innovative methods for characterizing evolution and budgets in water/rock systems: A tribute to Tom Bullen and Stepan Shvartsev

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