论文标题
苏打湖地热场的三维地震特征和成像
Three-dimensional seismic characterization and imaging of the Soda Lake geothermal field
论文作者
论文摘要
地下地球物理特性的准确表征和断层系统的检测对于地热能量勘探和生产至关重要。苏打湖地热田位于内华达州西部，具有复杂的断层系统。以前的地震表征仅产生了低分辨率，平滑的速度模型以及简单的概念故障模型。使用基于优化的相关性全波倒置，基于波场分离的反向时间迁移以及自动故障检测技术，我们使用带有颤音源的3D表面地震数据为苏打湖地热场提供了3D地震表征。我们获得3D高分辨率速度，密度和声学阻抗模型，具有不同网格间距的3D地震图像以及高分辨率断层系统。在构建的故障与当前有效注入和生产地热井之间的一致性检查验证了我们的地震倒置和成像结果和检测到的故障是可靠的。这些结果可以提供有价值的信息，以优化苏打湖地热场的井位和地热能生产。
Accurate characterization of subsurface geophysical properties and detection of the fault system are essential for geothermal energy exploration and production. The Soda Lake geothermal field is in western Nevada with a complex fault system. Previous seismic characterization only produced a low-resolution, smooth velocity model along with a simple, conceptual fault model. Using optimized correlation-based full-waveform inversion, wavefield-separation-based reverse-time migration, and automatic fault detection techniques, we present 3D seismic characterization for the Soda Lake geothermal field using 3D surface seismic data acquired with Vibroseis sources. We obtain 3D high-resolution velocity, density, and acoustic impedance models, 3D seismic images with different grid spacings, and a high-resolution fault system. Consistency check between the constructed faults and currently active injection and production geothermal wells verifies that our seismic inversion and imaging results and detected faults are reliable. These results can provide valuable information for optimizing well placement and geothermal energy production at the Soda Lake geothermal field.
