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首页> 外文期刊>Geothermics >Characterization of geothermal fluid flows at Sumikawa geothermal area, Japan, using two types of tracers and an improved multi-path model
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Characterization of geothermal fluid flows at Sumikawa geothermal area, Japan, using two types of tracers and an improved multi-path model

机译：使用两种示踪剂和改进的多径模型表征日本住川地热区的地热流体流

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Potassium bromide (KBr) and potassium iodide (KI) tracers were individually injected into two reinjection wells at Sumikawa: KI with steam condensate into one well and KBr with separated waste water at high temperature (140℃), into another well 1000 m away from the KI well. The tracer concentrations were then analyzed in all production wells for 16 months. The iodine tracer was first detected in two wells (wells S-4 and SB-1) within 1000 m of the injection well within 47 h and in other wells (with the exception of well SC-2) up to 1500 m away within 9 days after injection. Before background correction as mentioned below, most of the injected iodine tracer was recovered from the production wells within 6 months. The bromine tracer was also observed first in well S-4 within 5 days and in other wells within 1 month, except for well SC-2. These observations show that vapor condensate quickly returns into wells S-4 and SB-1 compared to geothermal fluids. These results are consistent with the previous calculations examined through a box model using chlorine concentrations and hydrogen isotope ratios of fluids from production wells. The results of the present tracer tests were examined using a multi-path model. First, the background concentrations of both tracers were recalculated because the total recovered amounts of I and Br exceed the amounts that were originally injected. The variations of the tracer concentrations were then fitted by setting two or three paths between the injection and production wells. Our calculations show that the recovered fractions of I and Br are 36 and 40%, respectively, and the velocities of fluids in the reservoir are estimated to be 0.4 to 14.9 m/h in the case of both tracers.
机译：将溴化钾（KBr）和碘化钾（KI）示踪剂分别注入到住川市的两个回注井中：KI和蒸汽冷凝水一起注入KI到一个井中，而KBr和高温下分离的废水（140℃）注入另一个离井1000 m KI很好。然后在所有生产井中分析示踪剂浓度达16个月。首先在47小时内在注入井1000 m内的两个井（S-4和SB-1井）中检测到碘示踪剂，在9井以内1500 m以内的其他井（SC-2井除外）中检测到碘示踪剂注射后几天。在进行如下所述的背景校正之前，大部分注入的碘示踪剂在6个月内从生产井中回收。还首先在5天之内的S-4井和1个月内的其他井中观察到了溴示踪剂，SC-2井除外。这些观察结果表明，与地热流体相比，蒸汽凝结水迅速返回S-4和SB-1井。这些结果与以前的计算结果一致，该计算结果是通过盒模型使用生产井中流体的氯浓度和氢同位素比进行检验的。使用多路径模型检查了当前示踪剂测试的结果。首先，重新计算了两种示踪剂的背景浓度，因为I和Br的总回收量超过了最初注入的量。然后通过在注入井和生产井之间设置两个或三个路径来拟合示踪剂浓度的变化。我们的计算表明，I和Br的回收率分别为36％和40％，对于两种示踪剂，储层中流体的速度估计为0.4至14.9 m / h。

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