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首页> 外文会议>Geothermal Resources Council annual meeting >Characterizing the Subsurface Structures and Determination of In-Situ Stress Orientations Using Acoustic Borehole Images: A Case Study from Theistareykir Geothermal Field, Northeastern Iceland
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Characterizing the Subsurface Structures and Determination of In-Situ Stress Orientations Using Acoustic Borehole Images: A Case Study from Theistareykir Geothermal Field, Northeastern Iceland

机译：利用声学钻孔图像表征地下结构并确定地应力方向：以冰岛东北部Theistareykir地热田为例

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Targeting structurally controlled permeability remains a challenge in geothermal fields, because of the difficulties in characterizing subsurface structures (faults and fractures) and their behavior within the reservoir. Sensitivity of measurement in combination with 100% circumferential coverage makes acoustic borehole images useful for detecting subsurface structures and providing direct data on in-situ stress orientations and lithology from within the borehole. The accuracy of the acoustic borehole images paired with skilled image interpretation helps to understand if faults / fractures are open or healed, which leads to optimized subsurface structure characterization to enhance well sitting and production. Production wells ThG 2,1 ThG 5,1 ThG 7,1 and ThG 81 were logged on behalf of Landsvirkjun between 2016 and 2017, using an Acoustic Borehole Imager ("ABI") tool deployed by Iceland GeoSurvey (Islenskar Orkurannsoknir (ISOR)). These production wells are located in Theistareykir geothermal field, Thingeyjarsveit, northeastern Iceland. A total of 5,889 meters of acoustic borehole image have been analysed and interpreted, and a total of 14,501 natural open fractures, 21 natural closed fractures, 169 possible open faults, 59 drilling induced fractures, and 64 borehole breakouts have been identified in the wells. Subsurface structure and in-situ stress orientations agree generally with the tectonic setting, though they display variations within the geothermal field. Subsurface structural variability and variations of in-situ stress orientation are related to larger scale fracture, fissure, and fault architectures in the Theistareykir geothermal field, i.e. NNE-SSW striking fractures and fissures of Mt. Baejarfjall and NW striking Tjarnaras fault. Acoustic borehole images also provide information on structural fluid flow pathways in the Theistareykir field. Natural open fractures and possible open faults are likely important contributors to permeability in the majority of feed zones identified in the production wells. Wide aperture natural open fractures and possible open fault with N-S/NNE-SSW strike orientations and high fracture density zones have been correlated to permeability indicators such as sudden increases in temperature, major changes of circulation loss rate, or decreases in fluid velocity logs.
机译：由于难以表征地下结构（断层和裂缝）及其在储层中的行为，在地热领域中，以结构控制的渗透率为目标仍然是一个挑战。测量的敏感性与100％的周向覆盖率相结合，使得井壁声学图像可用于检测地下结构，并提供有关井壁内部应力方向和岩性的直接数据。声井眼图像的准确性与熟练的图像解释相结合，有助于了解断层/裂缝是否已打开或已愈合，从而优化了地下结构特征，从而提高了井位和产量。在2016年至2017年期间，使用冰岛GeoSurvey部署的声孔成像仪（“ ABI”）工具代表Landsvirkjun记录了2,100、5,1、7和81的生产井。这些生产井位于冰岛东北部Thingeyjarsveit的Theistareykir地热田中。已分析和解释了总共5889米的声井眼图像，并且在井中总共发现了14501处自然裸眼裂缝，21处自然裸眼裂缝，169处可能的开放断层，59例钻井诱发的裂缝以及64眼井眼。地下结构和地应力方向通常与构造背景一致，尽管它们在地热场内显示出变化。地下结构的变异性和原地应力取向的变化与Theistareykir地热田中较大规模的裂缝，裂缝和断层构造有关，即NNE-SSW撞击Mt的裂缝和裂缝。 Baejarfjall和NW袭击了Tjarnaras的断层。声学钻孔图像还提供有关Theistareykir油田中结构流体流动路径的信息。自然裸露的裂缝和可能的裸露断层可能是生产井中确定的大多数进料区渗透率的重要因素。大口径天然裸露裂缝和可能具有N-S / NNE-SSW走向和高裂缝密度带的裸露断层与渗透率指标相关，例如温度突然升高，循环损耗率的重大变化或流速测井降低。

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