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首页> 外文会议>Workshop on Geothermal Reservoir Engineering >ROCK MECHANICAL TESTING AND PETROLOGIC ANALYSIS IN SUPPORT OF WELL STIMULATION ACTIVITIES AT THE DESERT PEAK GEOTHERMAL FIELD, NEVADA
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ROCK MECHANICAL TESTING AND PETROLOGIC ANALYSIS IN SUPPORT OF WELL STIMULATION ACTIVITIES AT THE DESERT PEAK GEOTHERMAL FIELD, NEVADA

机译：岩石力学检测与岩土学分析，以支持沙漠峰地热田，内华达州的良好刺激活动

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In preparation for well stimulation activities and the development of an enhanced geothermal system (EGS) in the Desert Peak geothermal field, a series of petrologic and rock mechanical tests were conducted on selected core samples to represent the proposed stimulation interval within Well 27-15. The stimulation interval (3000-3500 ft; 930-1085 m) consists of Tertiary rhyolite tuffs that overlie metamorphic basement rocks consisting of siliceous argillite and other fractured metasedimentary rocks. Petrographic and X-ray diffraction mineralogic analyses indicate that the rhyolitic rocks are variably devitrified, argillaceous, and siliceous; and host minor amounts of quartz-dolomite-calcite veins in siliceous units along the basement contact. Hydrothermal clays are dominated by expandable smectite-rich mixed-layer illite-smectite. Deeper in the metamorphic basement, young fractures are only partially mineralized with dolomite, siderite, calcite, and barite. The latter represent lightly permeable open fractures identified by a suite of acoustic and electrical image logs and pressure-temperature-spinner flowmeter surveys collected in this interval of the well. Hydraulic stimulation of the well is intended to enhance formation permeability through self-propping shear failure along the most optimally oriented and critically stressed of these fractures. Rock mechanical testing was conducted on the core samples to determine mechanical properties of the various lithologies including: radial versus axial volumetric strain, stress-strain relationships, dynamic versus static Young's moduli, and frictional strengths and failure responses under a variety of confining conditions. The results of the laboratory tests were used to construct Mohr-Coulomb failure envelopes for the proposed reservoir rocks. Pre- and post- test measurements on the deformed core plugs indicate up to a 20-fold enhancement in permeability in the originally tight rhyolite units as a result of shearing. Assuming that failure occurs on the same structural features in the well as in the core, these laboratory studies directly test the shear dilation concept in these clay-rich rocks, and are being used in combination with borehole stress measurements and fracture logging to predict fluid pressures required for initiation of shear dilation and permeability development within the geothermal reservoir.
机译：在制备井刺激活动和沙漠峰地热场中增强地热系统（EGS）的发展，在选定的核心样品上进行了一系列岩石和岩石机械测试，以表示提出的刺激间隔在27-15井内。刺激间隔（3000-3500 ft; 930-1085 m）由覆盖由硅石颗粒和其他骨折的元岩组成的变质地下室岩石组成。岩体和X射线衍射矿物学分析表明菱形岩石是可变的透过透过的，骨质和硅质的;沿着地下室接触以硅质单元宿主的少量石英 - 白云石 - 方解石静脉。水热粘土通过可扩张的富胶状混合层硅藻土来支配。在变质地下室更深，年轻的骨折仅与白云石，硫酸盐，方解石和重晶石部分矿化。后者代表通过在该井的这种间隔中收集的声学和电气图像日志和压力 - 温度 - 旋转器流量计调查鉴定的轻透明的开口骨折。井的液压刺激旨在通过自我推进的剪切失效来增强形成渗透性，沿着这些裂缝最佳定向和统治性强调。在核心样品上进行岩石机械测试，以确定各种岩性的机械性能，包括：径向与轴向容量应变，应力 - 应变关系，动态与静态杨氏的模数，以及在各种限制条件下的摩擦强度和故障反应。实验室测试的结果用于构建所提出的水库岩石的MoHR-Coulomb衰竭包络。由于剪切，变形芯塞上的测试前和测试后测量最高可达最初紧的流纹岩单元中的渗透率20倍。假设在核心良好的结构特征中发生故障，这些实验室研究直接在这些富含富含粘土的岩石中进行剪切扩张概念，并与钻孔胁迫测量和断裂测井结合使用以预测流体压力在地热储层中启动剪切扩张和渗透性发展所需的所需。

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