Geothermal assessment of the deep aquifers of the northwestern part of the Bohemian Cretaceous basin, Czech Republic

Jiráková, Hana; Procházka, M.; Dědeček, Petr; Kobr, M.; Hrkal, Zbyněk; Huneau, Frédéric; Coustumer, Philippe Le

doi:10.1016/j.geothermics.2011.02.002

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…Groundwater temperatures in the aquifer are of the order of 30°C which, using the equation of Anderson and Arthur (), generates a calcite equilibrium value of −13‰ (δ 18 O carb VPDB), or lower if higher temperatures developed in the geothermally influenced aquifer system (cf. Jiráková et al ., ). The isotopic composition of total dissolved inorganic carbon in the aquifer waters is also significantly lower than the host sediment, but is much more variable than for oxygen (−4·5 to −16·3‰ δ 13 C carb , Jiráková et al ., ).…”

Section: Oxygen Isotopes and The Late Turonian Cool Phasementioning

confidence: 99%

Intercontinental correlation of organic carbon and carbonate stable isotope records: evidence of climate and sea‐level change during the Turonian (Cretaceous)

Jarvis

Trabucho‐Alexandre

Gröcke

et al. 2015

The Depositional Record

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Carbon (d 13 C org , d 13 C carb ) and oxygen (d 18 O carb ) isotope records are presented for an expanded Upper Cretaceous (Turonian-Coniacian) hemipelagic succession cored in the central Bohemian Cretaceous Basin, Czech Republic. Geophysical logs, biostratigraphy and stable carbon isotope chemostratigraphy provide a high-resolution stratigraphic framework. The d 13 C carb and d 13 C org profiles are compared, and the time series correlated with published coeval marine and non-marine isotope records from Europe, North America and Japan. All previously named Turonian carbon isotope events are identified and correlated at high-resolution between multiple sections, in different facies, basins and continents. The viability of using both carbonate and organic matter carbon isotope chemostratigraphy for improved stratigraphic resolution, for placing stage boundaries, and for intercontinental correlation is demonstrated, but anchoring the time series using biostratigraphic data is essential. An Early to Middle Turonian thermal maximum followed by a synchronous episode of stepped cooling throughout Europe during the Middle to Late Turonian is evidenced by bulk carbonate and brachiopod shell d18 O carb data, and regional changes in the distribution and composition of macrofaunal assemblages. The Late Turonian Cool Phase in Europe was coincident with a period of long-term sea-level fall, with significant water-mass reorganization occurring during the mid-Late Turonian maximum lowstand. Falling D 13 C (d 13 C carb -d 13 C org ) trends coincident with two major cooling pulses, point to pCO 2 drawdown accompanying cooling, but the use of paired carbon isotopes as a high-resolution pCO 2 proxy is compromised in the low-carbonate sediments of the Bohemian Basin study section by diagenetic overprinting of the d 13 C carb record. Carbon isotope chemostratigraphy is confirmed as a powerful tool for testing and refining intercontinental and marine to terrestrial correlations.

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Section: Oxygen Isotopes and The Late Turonian Cool Phasementioning

confidence: 99%

Intercontinental correlation of organic carbon and carbonate stable isotope records: evidence of climate and sea‐level change during the Turonian (Cretaceous)

Jarvis

Trabucho‐Alexandre

Gröcke

et al. 2015

The Depositional Record

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Determination of fluid-flow zones in a geothermal sandstone reservoir using thermal conductivity and temperature logs

Haffen¹,

Géraud²,

Diraison³

et al. 2013

Geothermics

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A methodology of locating fluid-flow zones in a rock formation is applied to the Buntsandstein sandstone reservoir of borehole EPS1, Soultz-sous-Forêts, France. The method is based on analysing thermal gradients determined by two different methods for a same cored borehole, (1) from temperature log and (2) from thermal conductivity measures. Comparing the two thermal-gradient datasets reveals the fluid-circulation zones in the borehole. Using this approach, we identified three main hot-fluid circulation zones within the Buntsandstein sandstone, two controlled by sedimentary facies and one controlled by tectonic structures.

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Rapid groundwater decline and some cases of recovery in aquifers globally

Jasechko,

Seybold,

Perrone

et al. 2024

Nature

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Groundwater resources are vital to ecosystems and livelihoods. Excessive groundwater withdrawals can cause groundwater levels to decline1–10, resulting in seawater intrusion11, land subsidence12,13, streamflow depletion14–16 and wells running dry17. However, the global pace and prevalence of local groundwater declines are poorly constrained, because in situ groundwater levels have not been synthesized at the global scale. Here we analyse in situ groundwater-level trends for 170,000 monitoring wells and 1,693 aquifer systems in countries that encompass approximately 75% of global groundwater withdrawals18. We show that rapid groundwater-level declines (>0.5 m year−1) are widespread in the twenty-first century, especially in dry regions with extensive croplands. Critically, we also show that groundwater-level declines have accelerated over the past four decades in 30% of the world’s regional aquifers. This widespread acceleration in groundwater-level deepening highlights an urgent need for more effective measures to address groundwater depletion. Our analysis also reveals specific cases in which depletion trends have reversed following policy changes, managed aquifer recharge and surface-water diversions, demonstrating the potential for depleted aquifer systems to recover.

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Geothermal assessment of the deep aquifers of the northwestern part of the Bohemian Cretaceous basin, Czech Republic

Cited by 4 publications

References 29 publications

Intercontinental correlation of organic carbon and carbonate stable isotope records: evidence of climate and sea‐level change during the Turonian (Cretaceous)

Intercontinental correlation of organic carbon and carbonate stable isotope records: evidence of climate and sea‐level change during the Turonian (Cretaceous)

Determination of fluid-flow zones in a geothermal sandstone reservoir using thermal conductivity and temperature logs

Rapid groundwater decline and some cases of recovery in aquifers globally

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