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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Signature of ongoing brine reinjection on noble gas isotopes and fluid chemistry at Las Tres Virgenes geothermal field, Mexico
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Signature of ongoing brine reinjection on noble gas isotopes and fluid chemistry at Las Tres Virgenes geothermal field, Mexico

机译：持续的盐水再调味符号在贵族气体同位素和液体化学的营养静脉注射，墨西哥地热场地

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A geochemical survey of the Las Tres Virgenes geothermal field (LTVGF), Baja California Sur, Mexico, was carried out to determine the origin and evolution of its fluids, along with the influence of injection of local brines, and inhibitors intended to manage carbonate scaling issues. Major and minor cations, Cl, Br, Sr, O, H, and noble gas (He, Ne, Ar, Kr and Xe) isotopes were measured in fluids collected from four production wells, two injection wells, and one fumarole (El Azufre) in 2016 and 2018. Variations in the stable isotopes of water (delta D and delta O-18) and halogens (delta Cl-32, delta Br-81) over the years suggest that local brine reinjection might have started to modify the pristine chemistry of the fluids. However, relevant information on the original geothermal fluids has been preserved. The Na/Br and Cl/Br ratios suggest that LTVGF brines are seawater having leached evaporite deposits (halite). These deposits are absent in the area, but were likely present during the Miocene, prior to the breakup of the Gulf of California, suggesting that the saline fluid end-member at the LTVGF could be several million years old. Measured He-3/He-4 ratios (R) normalized to the atmospheric ratio Ra (= 1.384 x 10(-6)) plotted against the He-4/Ne-20 ratios suggest mixing between a mantle fluid with a R/Ra of 6.19, typical of the sub-continental litho spheric mantle and an atmospheric helium component. The R/Ra versus the Xe-132/Ar-36 ratio normalized to air suggests mixing between a mantle-rich pre-production fluid and air. The source of air appears to be linked to local gravity-controlled flow reinjection which causes the entrapment of air bubbles, leading to a fluid supersaturated in atmospheric noble gases. This pattern suggests that reinjection fluids are impacting the production area. (C) 2019 Elsevier B.V. All rights reserved.
机译：对LAS TRES VIRGENES GEOTHETMER FIELD（LTVGF）的地球化学调查进行了墨西哥，墨西哥，以确定其流体的起源和演化以及注射局部盐水的影响，以及旨在管理碳酸盐缩放的抑制剂问题。在由四种生产井，两台注射孔和一个尺子（EL AZUFRE）收集的流体中测量主要和次要阳离子，Cl，Br，Sr，o，h和惰性气体（He，Ne，Ar，Kr和x-R和xe）同位素。 ）在2016年和2018年。多年来，水（Delta D和Delta O-18）和卤素（Delta Cl-32，Delta Br-81）的变异表明本地盐水再注入可能已经开始修改原始液体化学。但是，已经保留了有关原始地热液体的相关信息。 Na / Br和Cl / Br比例表明LTVGF盐水是海水，浸出蒸发岩沉积物（宿骨）。这些沉积物不存在于该地区，但在加利福尼亚州湾分发之前，在内科期间可能存在，这表明LTVGF的盐水封端可以是几百万年。测量到归一化到大气比率Ra的HE-3 / HE-4比率（R）（= 1.384×10（-6）），绘制针对HE-4 / NE-20比率，表明用R / Ra的披风液之间混合6.19，典型的亚大陆Litho球形披风和大气氦组件。 R / Ra与XE-132 / Ar-36的比率标准化为空气，表明富含披风的预生产流体和空气之间的混合。空气源似乎与局部重力控制的流量再注面有关，这导致气泡夹带，导致在大气惰性气体中过度饱和的流体。该模式表明再注化流体正在影响生产区域。 （c）2019 Elsevier B.v.保留所有权利。

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