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首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >The origin of reservoir fluids in the geothermal field of Los Azufres, Mexico - isotopical and hydrological indications
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The origin of reservoir fluids in the geothermal field of Los Azufres, Mexico - isotopical and hydrological indications

机译：墨西哥Los Azufres地热田中储层流体的起源-同位素和水文指示

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The calculation of hydrological balance resulted in a potential, average annual infiltration rate of 446 +/- 206 mm/m(2) for the Los Azufres geothermal area, which corresponds to a total of 82 x 10(6) m(3) per a. Due to the highly fractured and faulted structure of the volcanic formations, a considerable potential for the infiltration of recent meteoric water into deeper sections of the volcanic formations can be assumed. Isotopic data indicate the minor importance of recent meteoric water for the recharge of the geothermal reservoir. Very negative delta C-13 values can be explained by the input of organic C from the surface, but the lack of C-14 in the deep fluids reflects a pre-historic age for the infiltration event of fossil meteoric water. The dilution of the meteoric water by C-14-free CO2 gas from a shallow magma chamber complicates the exact age determination of the infiltration event, which probably occurred during the Late Pleistocene or Early Holocene glacial period. Strong water-rock interaction processes, such as sericitization/chloritization, caused the primary brine composition to be camouflaged. A preliminary hydrological model of the reservoir can be postulated as follows: the fossil hydrodynamic system was characterized by the infiltration of meteoric water and mixing with andesitic and/or magmatic water. Strong water-rock interaction processes in the main part of the production zone prove the existence of former active fluid circulation systems. Due to changes in pressure and temperature, the rising fluids get separated into liquid and vapour phases at a depth of 1500 in. After cooling, the main portions of both phases remain within the convective reservoir cycle. Isotope analyses of hot spring waters indicate the direct communication of the reservoir with the surface at some local outcrops. A recent reactivation of the hydrodynamic system is caused by the geothermal production, as indicated by the detection of lateral communication between some production and reinjection wells. (C) 2001 Elsevier Science Ltd. All rights reserved. [References: 58]
机译：水文平衡的计算得出Los Azufres地热区域的潜在平均年渗透率为446 +/- 206 mm / m（2），相当于每总地热面积82 x 10（6）m（3）一种。由于火山岩地层的高度断裂和断层的结构，可以认为近期的陨石水渗透到火山岩地层较深部分的潜力很大。同位素数据表明，最近的陨石水对地热储层的补给作用不大。地表C的输入可以解释非常负的C-13值，但是深层流体中C-14的缺乏反映了化石陨石水渗透事件的史前年龄。来自浅部岩浆室的不含C-14的CO2气体对陨石水的稀释使渗透事件的确切年龄确定变得复杂，这可能发生在更新世晚期或全新世早期冰川时期。强烈的水-岩石相互作用过程（例如胶凝作用/氯化作用）导致主要的盐水成分被伪装。可以假定储层的初步水文模型如下：化石水动力系统的特征是流星水的渗入并与安山岩和/或岩浆水混合。生产区主要部分中强烈的水-岩相互作用过程证明了以前活跃的流体循环系统的存在。由于压力和温度的变化，上升的流体在1500英寸的深度处分离为液相和气相。冷却后，两相的主要部分保留在对流储层循环内。温泉水的同位素分析表明，在某些局部露头处，储层与地表直接连通。流体动力系统最近的重新激活是由地热生产引起的，正如某些生产井和回注井之间横向连通的探测所表明的那样。 （C）2001 Elsevier ScienceLtd。保留所有权利。 [参考：58]

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