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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Three dimensional inversion of magnetotelluric (MT) resistivity data from Reykjanes high temperature field in SW Iceland
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Three dimensional inversion of magnetotelluric (MT) resistivity data from Reykjanes high temperature field in SW Iceland

机译：来自冰岛西南部雷克雅尼斯高温场的大地电磁（MT）电阻率数据的三维反演

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The resistivity structure of Reykjanes is presented, derived from a three dimensional (3D) model developed in 2016. The model is the final results of a 3D inversion of MT data, corrected for static shift by joint inversion with TEM soundings at the same location as the MT soundings. In the model presented here (REYSAND), a total of 136 sounding pairs are used for the inversion. The model covers Reykjanes area and Sandy& potential geothermal area. The resistivity structure of a high enthalpy system reflects the thermal alteration of the rock. The Reykjanes models reveal a conventional resistivity structure for a high enthalpy geothermal system, i.e. a low resistivity cap underlain by a high resistivity core. The low resistivity cap reaches surface in the hot spring area, Gunnuhver, and dips down in all directions forming an elongated area of 2.5 km x 3 km in strike direction down to 1 km depth bounded by the low resistivity. The resistivity of the low resistivity cap is less 3 Omega m and is underlain by a high resistivity core with resistivity of 10-30 Omega m down to 3 km depth. At greater depth, high resistivity anomalies are prominent with a zone of lower resistivity, in strike direction, under the main field. This zone coincides with an aseismic zone at depth and may indicate a fracture zone with higher temperature and/or permeability within the geothermal system. Comparison to data from the 1DDP-2 drilling as well as seismic monitoring confirms that suggestion. (C) 2018 Published by Elsevier B.V.
机译：呈现了雷克雅尼斯的电阻率结构，该结构来自于2016年开发的三维（3D）模型。该模型是MT数据的3D反演的最终结果，并通过与TEM测深在同一位置的联合反演对静态位移进行了校正。 MT的声音。在此处介绍的模型（REYSAND）中，总共使用了136个探测对。该模型覆盖了雷克雅尼斯地区和桑迪及潜在的地热地区。高焓系统的电阻率结构反映了岩石的热变化。 Reykjanes模型揭示了用于高焓地热系统的常规电阻率结构，即高电阻率岩心下面的低电阻率盖层。低电阻率盖到达温泉区Gunnuhver的表面，并在所有方向上向下倾斜，形成沿走向的2.5 km x 3 km的拉长区域，向下延伸至低电阻率界定的1 km深度。低电阻率盖的电阻率小于3 Omega m，并由高电阻率磁心支撑，该电阻率低至3 km深度为10-30 Omega m。在更大的深度处，在主磁场下，高电阻率异常在走动方向上以较低电阻率的区域突出。该区域在深度上与抗震区域重合，并可能表明地热系统中具有较高温度和/或渗透率的裂缝区域。与1DDP-2钻井数据和地震监测数据的比较证实了这一建议。 （C）2018由Elsevier B.V.发布

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