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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Evaluation of mineral-aqueous chemical equilibria of felsic reservoirs with low-medium temperature: A comparative study in Yangbajing geothermal field and Guangdong geothermal fields
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Evaluation of mineral-aqueous chemical equilibria of felsic reservoirs with low-medium temperature: A comparative study in Yangbajing geothermal field and Guangdong geothermal fields

机译：中低温长英质储层矿物水化学平衡评价：羊八井地热田与广东地热田的比较研究

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Classical geothermometers are useful tools for estimating reservoir temperatures of geothermal systems. However, their application to low-medium temperature reservoirs is limited because large variations of temperatures calculated by different classical geothermometers are usually observed. In order to help choose the most appropriate classical geothermometer for calculating the temperatures of low-medium tempirature reservoirs, this study evaluated the mineral-aqueous equilibria of typical low-medium temperature felsic reservoirs in the Yangbajing geothermal field and Guangdong geothermal fields. The findings of this study support that reservoirs in the Guangdong geothermal fields have no direct magma influence. Also, natural reservoirs may represent the intermediate steady state before reaching full equilibrium, which rarely occurs. For the low-medium temperature geothermal systems without the influence of magma, even with seawater intrusion, the process of minerals reaching mineral-aqueous equilibrium is sequential: chlorite and chalcedony are the first, then followed by K-feldspar, kaolinite and K-mica. Chlorite may reach equilibrium at varying activity values, and the equilibrium between K-feldspar and kaolinite or K-feldspar and K-mica can fix the contents of K and Al in the solutions. Although the SiO2 and Al attain equilibrium state, albite and laumontite remain unsaturated and thus may affect low-medium temperature calculations. In this study, the chalcedony geothermometer was found to be the most suitable geothermometer for low-medium temperature reservoirs. The results of K-Mg geothermometer may be useful to complement that of the chalcedony geothermometer in low-medium temperature reservoir systems. Na-K geothermometer will give unreliable results at low-medium temperatures: and Na-K-Ca will also be unsuitable to calculate reservoir temperatures lower than 180 degrees C, probably caused by the chemical imbalance of laumontite. (C) 2018 Published by Elsevier B.V.
机译：经典的地热仪是估算地热系统储层温度的有用工具。但是，由于通常观察到由不同的经典地热仪计算出的温度变化较大，因此它们在中低温度储层中的应用受到限制。为了帮助选择最合适的经典地温计来计算中温温度储层的温度，本研究评估了洋八井地热田和广东地热田中典型的中低温长英质储层的矿水平衡。这项研究的结果支持广东地热田中的储层没有直接的岩浆影响。同样，天然油藏可能代表达到完全平衡之前的中间稳态，这种情况很少发生。对于没有岩浆影响的中低温地热系统，即使有海水入侵，矿物也是达到矿水平衡的过程是顺序的：首先是绿泥石和玉髓，然后是钾长石，高岭石和钾云母。 。亚氯酸盐可能在不同的活度值下达到平衡，钾长石与高岭石或钾长石与云母之间的平衡可以固定溶液中钾和铝的含量。尽管SiO2和Al达到平衡状态，但钠长石和月桂石仍处于不饱和状态，因此可能会影响中低温度的计算。在这项研究中，玉髓地热仪被发现是最适合中低温度储层的地热仪。 K-Mg地热仪的结果可能对补充中低温度储层系统中玉髓地热仪的结果很有用。 Na-K地热仪在中低温度下将无法获得可靠的结果：Na-K-Ca也将不适合计算低于180摄氏度的储层温度，这可能是由于月桂石的化学失衡造成的。 （C）2018由Elsevier B.V.发布

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