Hydrogen, oxygen, helium and strontium isotopic constraints on the formation of oilfield waters in the western Qaidam Basin, China

Tan, Hongbing; Rao, Wenbo; Ma, Hao; Chen, Jiansheng; Li, Tingwei

doi:10.1016/j.jseaes.2010.10.018

Cited by 42 publications

(56 citation statements)

References 29 publications

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“…The Qaidam Basin is a large,closed,inland basin in the northwest of China. It is surrounded by high mountains, namely the Altun Mountain to the northwest, the Qilian Mountain to the northeast, and the Kunlun Mountain to the south (Wei and Jiang, 1994;Yin et al, 2008;Tan et al, 2011;Heermance et al, 2013;Li et al, 2015;Zhu et al, 2018). As shown in Fig.…”

Section: Location and Climatementioning

confidence: 99%

Hydrochemical Dynamic Characteristics and Evolution of Underground Brine in the Mahai Salt Lake of the Qaidam Basin Qinghai‐Tibet Plateau

Zhao

Wang

et al. 2018

Acta Geologica Sinica (Eng)

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The mineral rock salts present in the Mahai Salt Lake of the Qaidam basin exhibit high solubilities in water. In addition, the multicomponent underground brine exhibits a high salinity and is easily precipitated. In the natural state, brine transport in the brine layer is extremely slow, and the brine is in a relatively stable chemical equilibrium state with the rock salt media. However, during mining, both the seepage and the chemical fields fluctuate significantly, thereby disrupting the equilibrium and leading to variations in the chemical composition and dynamic characteristics of the brine. Therefore, we selected underground brine from the Mahai Salt Lake, collecting a total of 183 brine samples over three stages of mining (i.e., the early stage of underground brine extraction, the initial stage of mining, and the later stage of mining). Using a range of analytical techniques, the chemical dynamics of the underground brine water and its evolution were systematically studied. We found that evaporation and enrichment were the main mechanisms of underground brine evolution in the Mahai Salt Lake, with cation exchange and mineral dissolution/precipitation being key factors in determining the dynamic characteristics and evolution of the brine.

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Section: Location and Climatementioning

confidence: 99%

Hydrochemical Dynamic Characteristics and Evolution of Underground Brine in the Mahai Salt Lake of the Qaidam Basin Qinghai‐Tibet Plateau

Zhao

Wang

et al. 2018

Acta Geologica Sinica (Eng)

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“…Modern worldwide precipitation produces the Meteroric Water Line (WMWL), the local precipitation produces the Meteroric Water Line (LMWL) (Zhang et al, 1993), and local brine evaporated produced Evapoconcentrated Water Line (EWL) (Tan et al, 2011). Four typical types of formation brines produced in Sichuan Basin are also included: a-Average meteoric weathering water (-61‰ in δD and -8.7‰ in δ 18 O)；b-Average sedimentary seawater (-21‰ in δD and 0.1‰ in δ 18 O)；c-Average mixture of seawater and meteoric water (-46‰ in δD and -2.9‰ in δ 18 O)；d-Average mixture of magmatic fluids and seawater (-53 to 39‰ in δD and 3.2 to 5.9‰ in δ 18 O) (Lin and Xiong,2001).…”

Section: Fig 3 Stable H and O Isotopic Compositions Of Gasikule Saltmentioning

confidence: 99%

Hydrochemistry of the Gasikule Salt Lake, Western Qaidam Basin of China

Zheng

Wang

et al. 2014

Acta Geologica Sinica - English Edition

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“…An abundance of shallow, K-rich brines, including the surface brines and intercrystalline brines, occur in these salt lakes (Figures 1 and 2), making the QB the largest potash fertilizer production base in China at present. In recent years, geological explorations have also reported that deep K-rich brines, including pore brines and oilfield brines, exist in the western QB (Figures 1 and 2) [13][14][15][16][17][18][19][20][21], which are of great importance for the future supply of potash fertilizers in China. All these shallow (including surface brines and intercrystalline brines) and deep brines (including pore brines and oilfield brines) in the QB have reached up to the industrial requirements (K + > 1.5 g/L for brines) in China [22].…”

Section: Introductionmentioning

confidence: 99%

The Source, Distribution, and Sedimentary Pattern of K-Rich Brines in the Qaidam Basin, Western China

Zhang

Fan

et al. 2019

Minerals

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Potash plays an important role in agricultural production. The Qaidam Basin (QB) in western China is a typical inland evaporite basin, which contains an abundance of K-rich brines, including shallow brines (i.e., surface brines and intercrystalline brines) in salt lakes and deep brines (i.e., pore brines and oilfield brines) in the strata. Significant studies on these brines have been reported; however, the integrated studies on sources of K, its distribution, and the sedimentary pattern of the two brine types are still inadequate. In this study, the K + concentrations of sixty-four intercrystalline brines from the Qarhan Salt Lake (QSL), the largest playa in the QB, are presented. After combining those results with the major ionic compositions of river waters and deep K-rich brines, and the K + concentrations of shallow brines in the QB, we concluded that: (1) The K of brines in the QSL is mainly from the high-flux K input by rivers which gain K from silicate weathering, while the "ancient Qaidam Lake" contributed little K to the QSL; (2) the large K flux supplied by rivers, the appropriate concentration degree, and the mixing of river waters and spring waters, cooperatively account for the highest K concentrations of brines in the QSL in the QB. The different river K recharges in different sections and isolated depressions are responsible for uneven K + concentrations of brines in the QSL.(3) The deep brines are mainly distributed in the western QB. The K source of pore brines is from the interaction of pore water with the overlying evaporite layer. While the K in oilfield brines may be meteoric water, salt dissolution, the mixing of hydrothermal fluids, and the conversion of clay minerals to K-feldspar may consume K in the oilfield brines.

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Hydrogen, oxygen, helium and strontium isotopic constraints on the formation of oilfield waters in the western Qaidam Basin, China

Cited by 42 publications

References 29 publications

Hydrochemical Dynamic Characteristics and Evolution of Underground Brine in the Mahai Salt Lake of the Qaidam Basin Qinghai‐Tibet Plateau

Hydrochemical Dynamic Characteristics and Evolution of Underground Brine in the Mahai Salt Lake of the Qaidam Basin Qinghai‐Tibet Plateau

Hydrochemistry of the Gasikule Salt Lake, Western Qaidam Basin of China

The Source, Distribution, and Sedimentary Pattern of K-Rich Brines in the Qaidam Basin, Western China

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