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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Magmatic volatiles to assess permeable volcano-tectonic structures in the Los Humeros geothermal field, Mexico
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Magmatic volatiles to assess permeable volcano-tectonic structures in the Los Humeros geothermal field, Mexico

机译：魔法挥发物，以评估Los Humeros地热场，墨西哥的可渗透火山构造结构

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摘要

Magmatic volatiles can be considered as the surface fingerprint of active volcanic systems, both during periods of quiescent and eruptive volcanic activity. The spatial variability of gas emissions at Earth's surface is a proxy for structural discontinuities in the subsurface of volcanic systems. We conducted extensive and regular spaced soil gas surveys within the Los Humeros geothermal field to improve the understanding of the structural control on fluid flow. Surveys at different scales were performed with the aim to i) identify areas of increased gas emissions (reservoir scale), ii) their relation to (un)known volcano-tectonic structures (fault scale) favoring fluid flow, and iii) determine the origin of gas emissions. Herein, we show results from a CO2 efflux scouting survey, which was performed across the main geothermal production zone (6 km x 4 km) together with soil temperature measurements. We identified five areas with increased CO2 emissions, where further sampling was performed with denser sampling grids to understand the fault zone architecture and local variations in gas emissions. CO2 efflux values range from below detection limit of the device to 1464 gm(-2) d(-1) with a total output of 87 t d(-1) across an area of 13.7 km(2). Furthermore, delta C-13(CO2) and He-3/He-4 analyses complemented the dataset in order to assess the origin of soil gases. Carbon isotopic data cover a broad spectrum from biogenous to endogenous sources. Determined He-3/He-4 ratios indicate a mantle component in the samples of up to 65% being most evident in the northwestern and southwestern part of the study area. We show that a systematic sampling approach on reservoir scale is necessary for the identification and assessment of major permeable fault segments. The combined processing of CO2 efflux and delta C-13(CO2) facilitated the detection of permeable structural segments with a connection to the deep, high-temperature geothermal reservoir, also in areas with low to intermediate CO2 emissions. The results of this study complement existing geophysical datasets and define further promising areas for future exploration activities in the north- and southwestern sector of the production field. (C) 2020 Elsevier B.V. All rights reserved.
机译：在静态和喷发火山活性期间，岩浆挥发物可以被认为是活性火山系统的表面指纹。地球表面气体排放的空间可变性是火山系统地下结构不连续的代理。我们在LOS Humeros地热场中进行了广泛而常规的间隔天然气调查，以改善对流体流动结构控制的理解。不同尺度的调查以I）识别增加的气体排放（储层规模），ii）与（UN）的关系，其有利的流体流动和III）的关系确定原点气体排放。在此，我们展示了CO2 Efflux Scouting调查的结果，该调查在主要地热生产区（6 km x 4km）以及土壤温度测量中进行。我们确定了有二氧化碳排放量增加的五个区域，其中使用更密集采样网格进行了进一步的采样，以了解故障区域架构和局部气体排放的局部变化。 CO2流出值范围从设备的低于检测限为1464GM（-2）D（-1），总输出为87 km（-1），面积为13.7 km（2）。此外，Delta C-13（CO2）和HE-3 / HE-4分析补充了数据集，以评估土壤气体的起源。碳同位素数据涵盖了生物源性的广谱与内源性源。确定的HE-3 / HE-4比率表示样品中的披风组分高达65％在研究区的西北部和西南部最明显。我们表明，对储层规模的系统采样方法是对主要渗透性故障段的识别和评估所必需的。 CO2 Efflux和Delta C-13（CO2）的组合处理促进了具有与深，高温地热储层的连接的可渗透结构段的检测，也在低至中间二氧化碳排放的区域。本研究的结果补充了现有的地球物理数据集，并在生产领域的北 - 和西南部部门的未来勘探活动中确定了进一步的有希望的领域。 （c）2020 Elsevier B.v.保留所有权利。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2020年第1期|106820.1-106820.14|共14页
  • 作者

    Jentsch Anna; Jolie Egbert; Jones David G.; Taylor-Curran Helen; Peiffer Loic; Zimmer Martin; Lister Bob;

  • 作者单位

    GFZ German Res Ctr Geosci D-14473 Potsdam Germany|Univ Potsdam Inst Geosci D-14476 Potsdam Germany;

    GFZ German Res Ctr Geosci D-14473 Potsdam Germany;

    British Geol Survey Nicker Hill Nottingham NG12 5GG England;

    British Geol Survey Nicker Hill Nottingham NG12 5GG England;

    CICESE Carr Tijuana Ensenada 3918 Ensenada 22860 Baja California Mexico;

    GFZ German Res Ctr Geosci D-14473 Potsdam Germany;

    British Geol Survey Nicker Hill Nottingham NG12 5GG England;

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