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Least-Squares Reverse-Time Migration of Walkaway VSP Data from the Raft River Geothermal Field

机译:从筏河地热场地的Laswaway VSP数据的最小二乘迁移

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The U.S. Department of Energy selected the Raft River geothermal field as an enhanced geothermal system demonstration project in 2010. Reliable geothermal reservoir characterization requires high-resolution subsurface imaging. We carried out a vertical seismic profile (VSP) survey in 2016 along five walkaway lines around the stimulation well, RRG-9 ST1. We construct a high-resolution velocity model using first-arrival traveltime tomography of the downgoing VSP data and elastic-waveform inversion of the VSP waveform data. We then use the inverted P- and S-velocity models and our newly developed least-squares reverse-time migration to obtain high-resolution P- and S-images of the Raft River geothermal reservoir. Our inversion version clearly reveals the low-velocity Narrows zone, which is the stimulation zone to enhance geothermal production.
机译:美国能源部选择了筏河地热场,成为2010年增强地热系统示范项目。可靠的地热储层特征需要高分辨率地下成像。我们在2016年在2016年沿着刺激井的五条散步线进行了垂直地震型材(VSP)调查,RRG-9 ST1。我们使用较低的VSP数据的初始旅行时间断层扫描构建高分辨率速度模型和VSP波形数据的弹性波形反转。然后,我们使用倒置的P - 和S速度模型以及我们的新开发的最小二乘性迁移,以获得筏河地热储层的高分辨率P和S图像。我们的反演版清楚地揭示了低速窄区,这是增强地热产量的刺激区。

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