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首页> 外文会议>Thirtieth workshop on geothermal reservoir engineering >3D MAGNETOTELLURIC CHARACTERIZATION OF THE COSO GEOTHERMAL FIELD
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3D MAGNETOTELLURIC CHARACTERIZATION OF THE COSO GEOTHERMAL FIELD

机译：COSO地热场的3D磁电特征

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摘要

Knowledge of the subsurface electricalrnresistivity/conductivity can contribute to a betterrnunderstanding of complex hydrothermal systems,rntypified by Coso geothermal field, through mappingrnthe geometry (bounds and controlling structures) overrnexisting production.rnThree-dimensional magnetotelluric (MT) inversion isrnnow an emerging technology for characterizing thernresistivity structures of complex geothermal systems.rnThe method appears to hold great promise, butrnhistories exploiting truly 3D inversion thatrndemonstrate the advantages that can be gained byrnacquiring and analyzing MT data in three dimensionsrnare still few in number. This project will address saidrnissue, by applying 3D MT forward modeling andrninversion to a MT data set acquired over the Cosorngeothermal field. The goal of the project is to providernthe capability to image large geothermal reservoirs inrna single self-consistent model. Initial analysis of thernCoso MT data has been carried out using 2D MTrnimaging technology to construct an initial 3Drnresistivity model from a series of 2D resistivityrnimages obtained using the inline electric fieldrnmeasurements (Zxy impedance elements) alongrndifferent measurement transects. This model will bernsubsequently refined through a 3D inversion process.rnThe initial 3D resisitivity model clearly shows therncontrolling geological structures possibly influencingrnwell production at Coso. The field data however, alsornshow clear three dimensionality below 1 Hz,rndemonstrating the limitations of 2D resistivityrnimaging. The 3D MT predicted data arising from thisrnstarting model show good correspondence inrndominant components of the impedance tensor (Zxyrnand Zyx) above 1Hz. Below 1 Hz there is significantdifferences between the field data and the 2D modelrndata.
机译：了解地下电阻率/电导率有助于更好地了解复杂的热液系统，通过绘制过度存在的产量的几何形状（边界和控制结构）来描绘由Coso地热场代表的类型。三维大地电磁（MT）反演是表征电阻率的新兴技术该方法似乎具有广阔的前景，但是利用真正的3D反演的历史却证明了通过获取和分析三维MT数据可以获得的优势。该项目将通过对在Cosorngeothermal油田获得的MT数据集应用3D MT正演建模和反演来解决上述问题。该项目的目标是在单个自洽模型中提供对大型地热储层进行成像的能力。已使用2D MTrnimaging技术对rnCoso MT数据进行了初步分析，以利用沿着不同测量样条的在线电场测量（Zxy阻抗元件）获得的一系列2D电阻率图像来构建初始3D电阻率模型。随后将通过3D反演过程对该模型进行完善。最初的3D电阻率模型清楚地显示了可能影响Coso井产量的控制地质结构。但是，现场数据也显示出低于1 Hz的清晰三维，这说明了二维电阻率成像的局限性。由该启动模型产生的3D MT预测数据显示，高于1Hz的阻抗张量（Zxyrn和Zyx）的良好对应无关分量。低于1 Hz，场数据与2D模型数据之间存在显着差异。

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  • 会议地点 Stanford CA(US)
  • 作者

    Gregory A. Newman; Michael Hoversten; Erika Gasperikova; Philip E. Wannamaker;

  • 作者单位

    Lawrence Berkeley National Laboratory, Earth Sciences Divisionrn1 Cyclotron Road, Berkeley CA, 94720 rne-mail:ganewman@lbl.gov;

    Lawrence Berkeley National Laboratory, Earth Sciences Divisionrn1 Cyclotron Road, Berkeley CA, 94720;

    Lawrence Berkeley National Laboratory, Earth Sciences Divisionrn1 Cyclotron Road, Berkeley CA, 94720;

    University of Utah/Energy Geosciences Institutern423 Wakara Way, Suite 300rnSalt Lake City, UT 84108;

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