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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Electromagnetic outline of the Solfatara-Pisciarelli hydrothermal system, Campi Flegrei (Southern Italy)
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Electromagnetic outline of the Solfatara-Pisciarelli hydrothermal system, Campi Flegrei (Southern Italy)

机译：Campi Flegrei（意大利南部）Solfatara-Pisciarelli热液系统的电磁轮廓

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摘要

We describe the results from a combined controlled source audio magnetotelluric (CSAMT) and natural source magnetotelluric (MT) survey carried out in the Solfatara-Pisciarelli (S-P) area, located in the central part of the Campi Flegrei (CF) composite caldera, west of Naples, Southern Italy. The S-P area represents the most active zone within the CF caldera, in terms of hydrothermal manifestations and local seismicity. Since 1969, the CF caldera is experiencing ground deformation, seismicity and geochemical fluid changes, which are particularly evident in the S-P area. A 1 km long, nearly W-E directed CSAMT-MT profile crossing the fumarole field was carried out in the S-P area with the aim of deducting a resistivity model of the structural setting of the hydrothermal system in the first 3 km depth. An interpretation of the modelled section across the profile is given in this paper, taking advantage from already existing seismic, gravity and geochemical data in the same area. Three well distinct zones have been outlined. The first zone is a very shallow, electrically conductive body localized beneath the westernmost segment of the profile, which, within a short distance of about 100 m, dips westwards from near surface down to some hundred metres in depth. Mostly accounting for the very low resistivity (1-10 Ω m) and the exceedingly high values of v_p/v_s (＞4), this shallow zone has been ascribed to a water-saturated, high-pressurized geothermal reservoir. The second zone, which has been localized below the west-central portion of the CSAMT-MT transect, appears as a composite body made up of a nearly vertical plumelike structure that escapes at about 2.25 km depth from the top edge of the east side of a presumably horizontal plate-like body. The plumelike structure rises up to the free surface in correspondence of the fumarole field, whereas the platelike structure deepens at least down to the 3 km of maximum exploration depth. The combined interpretation of resistivity (50-100 Ω m), body wave velocity ratio (v_p/v_s ＜ 2.0), mass density contrast (Δσ＜ 0 g/cm~3), and geochemical data indicates that the plumelike portion can likely be associated with a steam/gas-saturated column and the platelike portion with a high temperature (＞300 ℃), over-pressurized, gas-saturated reservoir. Finally, the third zone, which has been localized beneath the eastern half of the transect, from about 1.2 km down to about 3 km of depth, is also characterized by very low resistivity values (1-10 Ω m). Jointly interpreted with seismic (v_P/v_s ＜ 1.73) and gravity ((⊕) ＞ 0 g/cm~3) data, this last electrically conductive structure appears to be associated with a hydrothermally mineralized, clay-rich body.
机译：我们描述了在位于Campi Flegrei（CF）复合火山口中部中部的Solfatara-Pisciarelli（SP）地区进行的混合控制源音频大地电磁（CSAMT）和自然源大地电磁（MT）调查的结果意大利南部那不勒斯市。就水热表现和局部地震活动而言，S-P区域代表了CF破火山口中最活跃的区域。自1969年以来，CF破火山口就经历了地面变形，地震活动和地球化学流体变化，这在S-P地区尤为明显。在S-P地区进行了一个1 km长，近W-E定向的CSAMT-MT剖面横穿喷气孔领域，目的是推导出前3 km深度热液系统结构设置的电阻率模型。本文利用同一地区已经存在的地震，重力和地球化学数据，对剖面中的模拟剖面进行了解释。概述了三个截然不同的区域。第一个区域是位于剖面最西端部分下方的非常浅的导电体，该区域在约100 m的短距离内从近地表向西倾斜至数百米深。主要是由于极低的电阻率（1-10Ωm）和v_p / v_s的极高值（＞ 4），该浅层区域被归因于水饱和的高压地热储层。第二个区域已经定位在CSAMT-MT断面的中西部以下，它是由几乎垂直的羽状结构组成的复合体，该结构从东部的顶边约2.25 km处逸出。大概是水平的板状物体。羽状结构上升到与喷气孔磁场相对应的自由表面，而板状结构至少加深到最大勘探深度的3 km。电阻率（50-100Ωm），体波速度比（v_p / v_s ＜2.0），质量密度对比（Δσ＜0 g / cm〜3）和地球化学数据的综合解释表明，羽状部分可能是与蒸汽/气体饱和塔和温度较高（> 300℃），超压，气体饱和的油藏的板状部分相关。最后，第三个区域位于断面的东半部以下，从大约1.2 km到大约3 km的深度，其特征还在于极低的电阻率值（1-10Ωm）。结合地震数据（v_P / v_s ＜1.73）和重力数据（（⊕）＞ 0 g / cm〜3）共同解释，这最后一个导电结构似乎与水热矿化的富粘土体有关。

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