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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >3-D FEM Azimuth Forward Modeling of Hydraulic Fractures Based on Electromagnetic Theory
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3-D FEM Azimuth Forward Modeling of Hydraulic Fractures Based on Electromagnetic Theory

机译：基于电磁理论的液压骨折的3-D有限元方向模型

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Accurate monitoring of hydraulic fracturing fracture morphology is of great significance to the follow-up exploration and development work. Electromagnetic monitoring of fractures can effectively identify the effective propped volume (EPV) of fracturing fractures, making up for the disadvantages of other monitoring methods. This letter introduces a modeling method and a physical model based on very-low-frequency (VLF) electromagnetic scattering theory for monitoring the development of asymmetric fracturing fractures. The 3-D finite-element method (FEM) of equivalent fracturing fracture on transition boundary condition (TBC) surface is used to realize the fast forward modeling of 3-D space receiving response in large formations. A sector-shaped receiver is designed and the relationship between electromagnetic receiving signals and orientation parameters of asymmetric fracturing fractures, such as direction of fracture development and tilt angle, is discussed. By analyzing 3-D signals obtained from the rotating receiver sector, the spatial state of multiple asymmetric fracturing fractures can be determined. The problem of how to identify the 3-D direction of crack growth with electromagnetic monitoring method is solved, which provides a theoretical reference for the development and inversion of detection instruments.
机译：准确监测水力压裂骨折形态对后续勘探和开发工作具有重要意义。裂缝的电磁监测可以有效地识别压裂骨折的有效丙戊（EPV），弥补了其他监测方法的缺点。这封信介绍了基于极低频率（VLF）电磁散射理论的建模方法和物理模型，用于监测不对称压裂骨折的发展。转换边界条件（TBC）表面上的等效压裂骨折的3-D有限元方法（FEM）用于实现大型3-D空间接收响应的快进模型。讨论了扇形形接收器，并且讨论了电磁接收信号与不对称压裂骨折的方向参数的关系，例如断裂发育方向和倾斜角度。通过分析从旋转接收器扇区获得的3-D信号，可以确定多个不对称压裂裂缝的空间状态。解决了如何识别用电磁监测方法识别裂纹增长三维方向的问题，为检测仪器的开发和反演提供了理论参考。

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