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首页> 外文会议>Geothermal Resources Council annual meeting 2009 >Optimizing Geothermal Well Placement: Advantages of a Phased Approach Including Fracture Trace Analysis and Geophysical Techniques
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Optimizing Geothermal Well Placement: Advantages of a Phased Approach Including Fracture Trace Analysis and Geophysical Techniques

机译：优化地热井的位置：包括裂缝痕量分析和地球物理技术在内的分阶段方法的优势

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Bedrock drilling represents a substantial part of costs associated with the development of geothermal resources. Drilling costs can be reduced utilizing a series of phases that build upon each other to assess favorable drilling targets. Phase I should consist of review of all relevant geological and well data, fracture trace analysis and site reconnaissance. Site reconnaissance should document key geological features including rock lithologies, and fracture characteristics (orientation, spacing, aperture widths).rnPhase II should consist of surface geophysical surveys to locate transmissive fractures, including very low frequency, seismic, and resistivity. Re-processing available seismic data should be considered using alternative algorithms and/or alternative geophysical survey techniques to gain confidence that potential productive zones are not overlooked. The results of geophysical surveys should indicate the existence of favorable zones for test-well drilling.rnPhase III should consist of test well drilling and borehole geophysical logging. During drilling, the drill rig behavior, and changes in drill cuttings, water loss or gain, and drill bit advance rate should be documented as well as the depth of potential fracture zones. After cased open-hole test well(s) are completed and cleaned-out, borehole geophysics should be performed to determine breakouts, the depth of transmissive fractures, fracture orientation and fracture spacing. Discrete interval sampling of transmissive fractures, in conjunction with fracture orientation, and knowledge of regional fracture orientations may provide further insights into fluid characteristics and potential production rates.rnIn this paper, I will summarize the advantages of a phased approach utilizing fracture trace analysis, surface geophysics (seismic, resistivity, very low frequency [VLF]), and borehole geophysics (temperature, caliper, heat pulse flow meter, televiewer). Utilizing a phased approach and selected non-intrusive and in situ techniques can result in meeting investigation objectives in a single investigation thereby minimizing drilling costs. The phased approach utilizing applicable techniques, as described in this paper, can minimize drilling costs associated with commercial ground-source heat pump (GSHP) systems, exploration of hydrothermal resources, and stimulation of enhanced geothermal reservoirs.
机译：基岩钻探是与地热资源开发相关的大部分成本。可以利用相互依存的一系列阶段来评估有利的钻探目标，从而降低钻井成本。第一阶段应包括对所有相关地质和井眼数据的审查，裂缝痕迹分析和现场勘察。现场勘查应记录关键的地质特征，包括岩石岩性和裂缝特征（方向，间距，孔径宽度）。第二阶段应包括地面地球物理勘测，以定位透射性裂缝，包括极低频，地震和电阻率。应该考虑使用替代算法和/或替代地球物理勘测技术对可用地震数据进行重新处理，以确保不会忽视潜在的生产区。地球物理调查的结果应表明存在测试井钻探的有利区域。第三阶段应包括测试井钻探和钻孔地球物理测井。在钻井过程中，应记录钻机的行为，钻屑的变化，失水或增水以及钻头的前进速度以及潜在裂缝区域的深度。套管好的裸眼测试井完成并清理后，应进行井眼地球物理学以确定断层，透射裂缝的深度，裂缝方向和裂缝间距。传播性裂缝的离散时间间隔采样，结合裂缝方向以及对区域裂缝方向的了解，可能会提供有关流体特征和潜在生产率的进一步见解。在本文中，我将总结利用裂缝痕量分析，表面分析的分阶段方法的优势地球物理（地震，电阻率，甚低频[VLF]）和井眼地球物理（温度，卡尺，热脉冲流量计，望远仪）。使用分阶段方法以及选择的非侵入式和现场技术可以在单个调查中达到调查目标，从而最大程度地降低钻井成本。如本文所述，采用可应用技术的分阶段方法可以最大程度地减少与商业地源热泵（GSHP）系统，热液资源勘探以及增产地热储层相关的钻井成本。

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