Hydrochemical and isotopic (δ18O, δ2H, 87Sr/86Sr, δ37Cl and δ81Br) evidence for the origin of saline formation water in a gas reservoir

Bagheri, Rahim; Nadri, Arash; Raeisi, Ezzat; Eggenkamp, Hans; Kazemi, Gholam A.; Montaseri, Ali

doi:10.1016/j.chemgeo.2014.06.017

Cited by 75 publications

(37 citation statements)

References 66 publications

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“…δ 37 Cl values between −0.9‰ and 0‰, δ 81 Br values between −0.3‰ and +0.27‰, and δ 11 B values between 40‰ and 70‰ are all consistent with seawater values (Bagheri et al, ; Vengosh et al, ). Interestingly, the δ 37 Cl at 25‐m depth in Lake Bonney has a more positive value (0.32‰), perhaps suggesting a contribution of Cl − from halite dissolution (Bagheri et al, ; Shouakar‐Stash et al, ). The 0.44‰ δ 81 Br value for the hypolimnion of Lake Bonney may suggest some removal of 79 Br within the system (Hanlon et al, ).…”

Section: Resultssupporting

confidence: 72%

“…The Na:Cl and Br:Cl ratios all argue against the idea that all the Na-Cl present in these brines are derived from the dissolution of halite (Lyons et al, 2005). The Li:Cl ratio of the englacial brine also argues against this source (Bagheri et al, 2014), as do the δ 37 Cl and δ 81 Br values observed in the englacial brine. Therefore, we conclude that this is not a viable source of the observed salts.…”

Section: Solubilization Of Evaporite Depositsmentioning

confidence: 93%

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The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

et al. 2019

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Blood Falls is a hypersaline, iron‐rich discharge at the terminus of the Taylor Glacier in the McMurdo Dry Valleys, Antarctica. In November 2014, brine in a conduit within the glacier was penetrated and sampled using clean‐entry techniques and a thermoelectric melting probe called the IceMole. We analyzed the englacial brine sample for filterable iron (fFe), total Fe, major cations and anions, nutrients, organic carbon, and perchlorate. In addition, aliquots were analyzed for minor and trace elements and isotopes including δD and δ18O of water, δ34S and δ18O of sulfate, 234U, 238U, δ11B, 87Sr/86Sr, and δ81Br. These measurements were made in order to (1) determine the source and geochemical evolution of the brine and (2) compare the chemistry of the brine to that of nearby hypersaline lake waters and previous supraglacially sampled collections of Blood Falls outflow that were interpreted as end‐member brines. The englacial brine had higher Cl− concentrations than the Blood Falls end‐member outflow; however, other constituents were similar. The isotope data indicate that the water in the brine is derived from glacier melt. The H4SiO4 concentrations and U and Sr isotope suggest a high degree of chemical weathering products. The brine has a low N:P ratio of ~7.2 with most of the dissolved inorganic nitrogen in the form of NH4+. Dissolved organic carbon concentrations are similar to end‐member outflow values. Our results provide strong evidence that the original source of solutes in the brine was ancient seawater, which has been modified with the addition of chemical weathering products.

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Section: Resultssupporting

confidence: 72%

Section: Solubilization Of Evaporite Depositsmentioning

confidence: 93%

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

et al. 2019

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“…The origin, time of formation, and chemical evolution of brines in sedimentary basins and crystalline rock environments are still under debate (e.g. McNutt et al, 1987;Knauth, 1988;Herut et al, 1990;Frape et al, 2003;Starinsky and Katz, 2003;Leybourne and Goodfellow, 2007;Greene et al, 2008;Stotler et al, 2012;Bagheri et al, 2014). With respect to the origin and the time of formation of deep-seated brines, different scenarios have been invoked.…”

Section: Origin Of the Brinementioning

confidence: 99%

“…Herut et al, 1990;Bottomley et al, 1999;Starinsky and Katz, 2003), besides the dissolution of evaporite rocks, or a combination of these (e.g. Knauth, 1988;Fontes and Matray, 1993;Fritz, 1997;Vengosh et al, 2000;Pinti et al, 2011;Millot et al, 2011;Bagheri et al, 2014). These processes are often distinguished based on the chemical composition of the brine, which is complicated by the dissolution and precipitation of rock forming minerals that further modify the chemical composition of the brine on different time scales (e.g.…”

Section: Introductionmentioning

confidence: 99%

Using 81Kr and noble gases to characterize and date groundwater and brines in the Baltic Artesian Basin on the one-million-year timescale

Gerber

Vaikmäe

Aeschbach–Hertig

et al. 2017

Geochimica et Cosmochimica Acta

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Analyses for 81 Kr and noble gases on groundwater from the deepest aquifer system of the Baltic Artesian Basin (BAB) were performed to determine groundwater ages and uncover the flow dynamics of the system on a timescale of several hundred thousand years. We find that the system is controlled by mixing of three distinct water masses: Interglacial or recent meteoric water (δ 18 O ≈ −10.4‰) with a poorly evolved chemical and noble gas signature, glacial meltwater (δ 18 O ≤ −18 ‰) with elevated noble gas concentrations, and an old, high-salinity brine component (δ 18 O ≥ −4.5‰, ≥ 90 g Cl − /L) with strongly depleted atmospheric noble gas concentrations. The 81 Kr measurements are interpreted within this mixing framework to estimate the age of the endmembers. Deconvoluted 81 Kr ages range from 300 ka to 1.3 Ma for interglacial or recent meteoric water and glacial meltwater. For the brine component, ages exceed the dating range of the ATTA-3 instrument of 1.3 Ma. The radiogenic noble gas components 4 He* and 40 Ar* are less conclusive butalso support an age of > 1 Ma for the brine. Based on the chemical and noble gas concentrations and the dating results, we conclude that the brine originates from evaporated seawater that has been modified by later water-rock interaction. As the obtained tracer ages cover several glacial cycles, we discuss the impact of the glacial cycles on flow patterns in the studied aquifer system. Virbulis et al., 2013), the latter of which estimated the hydraulic age of groundwater in the CAS to be on the order of several hundreds of ka to 1 Ma. In the light of such long residence times, it is crucial to consider the effect of repeated glacial cycles on the long-term evolution of groundwater composition and flow. Sampling the deeper parts of the CAS on a regional scale for chemistry, noble gases, and multiple dating tracers ( 81 Kr, 85 Kr, 39 Ar, 14 C, 4 He, 40 Ar) allows us to elucidate the evolution of the brine, mixing proportions of the different groundwater components, and the flow dynamics over the last 1 Ma.

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“…Formation water in petroleum basins plays a vital role as media for the transport and redistribution of material and energy during the process of hydrocarbon generation, migration, and accumulation. The chemical composition, origin, and evolution can directly or indirectly reflect the closedness of sedimentary basin and hydrocarbon preservation conditions [4][5][6]. Therefore, understanding the origin, evolution, and controls on the composition of formation water is of considerable importance for successful appraisal of hydrocarbon exploration targets in sedimentary basins [7].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Origin and Evolution of Formation Water in Buried Hill of Jizhong Depression, China, Using Multivariate Statistical Analysis of Geochemical Data

Zeng

2017

Geofluids

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Groundwater samples from buried hill of Jizhong Depression were evaluated using two statistical analyses: hierarchical cluster analysis (HCA) and principal component analysis (PCA). The samples were classified into four clusters, C1-C4, in HCA and the hydrochemical types of C1-C4 are HCO 3 -Na, Cl⋅HCO 3 -Na, Cl-Na, and Cl-Na⋅Ca. From C1 to C2, C3, and C4, the water-rock interaction becomes increasingly intensive, and rNa/rCl gets lower while total dissolved solids and r(Cl-Na)/rMg get higher. Three components of PCA explain 86.87% of the variance. Component1 (PC1), characterized by highly positive loadings in Na + and Cl − , is related to evaporation concentration. Component2 (PC2) is defined by highly positive loading in HCO 3 − and is related to influence of atmospheric water. With high positive loadings in Ca 2+ and high negative loadings in Na + and SO 4 2− , component3 (PC3) suggests plagioclase albitization. The combination of HCA and PCA within the hydrogeological contexts allowed the division of study area into five dynamic areas. From recharge area to discharge area, the influence of atmospheric water gets weaker and water-rock interactions such as evaporation concentration and plagioclase albitization become intensive. Therefore groundwater in buried hill showed paths of hydrochemical evolution, from C1, to C2, C3, and C4. Buried hill reservoir in Jizhong Depression is mainly distributed in hydrodynamic blocking and discharge area; therefore the two regions can be the favorable areas for petroleum migration.

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Hydrochemical and isotopic (δ18O, δ2H, 87Sr/86Sr, δ37Cl and δ81Br) evidence for the origin of saline formation water in a gas reservoir

Cited by 75 publications

References 66 publications

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

Using 81Kr and noble gases to characterize and date groundwater and brines in the Baltic Artesian Basin on the one-million-year timescale

Characterization of Origin and Evolution of Formation Water in Buried Hill of Jizhong Depression, China, Using Multivariate Statistical Analysis of Geochemical Data

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