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首页> 外文会议>Geothermal Resources Council Annual Meeting Expo >Analysis of Natural and Drilling Induced Fractures from Newly Acquired Borehole Image Logs at the Star Peak Geothermal Field, NV: Implications for Localized Stress Field Rotation Within a Normal Fault Step-Over
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Analysis of Natural and Drilling Induced Fractures from Newly Acquired Borehole Image Logs at the Star Peak Geothermal Field, NV: Implications for Localized Stress Field Rotation Within a Normal Fault Step-Over

机译：在星峰地热场中新收购钻孔图像原木的自然和钻探诱导骨折分析，NV：局部应力场旋转在正常断层阶梯内的影响

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摘要

The orientations of open, partially open, and closed features were interpreted in three acoustic borehole image (ABI) logs recently collected at the Star Peak Geothermal Field. The most prevalent population of features across the logs have moderate to steep westerly dips, with secondary populations of higher angle east and southeast dipping features. These orientations are broadly consistent with structural trends observed along the Rye Patch fault zone. Drilling induced fractures were also identified in the ABI logs, providing a proxy for the maximum stress orientation within the geothermal field. Drilling induced fractures (DIFs) measured at the south end of the geothermal field exhibit a dominant north-northwest trending maximum stress field orientation, while DIFs in the center of the field show a rotation to an east-northeast trend, before returning to a north-trending orientation in the north. These all vary from the regional average stress field orientation, which trends north-northeast. The stress field rotations implicated by the DIFs at Star Peak may be related to a step-over in the Rye Patch Fault Zone near the center of the geothermal field.
机译：开放，部分开放和闭合特征的方向被解释为最近在星峰地热场收集的三个声学钻孔图像（ABI）日志中。日志中最普遍的特征群体具有中度陡峭的西方倾斜，具有高角度东和东南浸颇的二级群体。这些方向与沿着Rye贴片断层区域观察到的结构趋势广泛一致。还在ABI日志中识别钻孔诱导的裂缝，为地热场内的最大应力取向提供了代理。在地热场南端测量的钻探诱导骨折（DIFS）展示了北北 - 西北趋势最大应力场取向，而该领域中央的不同之处在于回到北部之前，距离东北趋势的旋转 - 北方的思考。这些都因区域平均压力场方向而异，北东北趋势。通过星峰的差异涉及的应力场旋转可以与地热场中心附近的Rye贴片断层区域中的阶跃有关。

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