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为了解决常规射线正演方法缺少地震波动力学信息以及在复杂构造中产生盲区等问题,将高斯射线束方法应用于斜井VSP正演研究当中.高斯束是波动方程沿射线附近的高频近似解,依赖于波的传播路径.检波点处的能量是对检波器附近有效半宽度范围内射线能量的高斯加权.斜井VSP高斯束正演方法适用于不同地质构造模型,同时保持波场的相对振幅特征.高斯束正演模拟具有高频波场特征,可用于薄层分析和识别;比较逐段迭代正演方法,解决了复杂地质模型的盲区与动力学特征问题.应用斜井VSP高斯束正演方法对W地区进行波场正演,正演结果表明该方法可以有效分辨地震波场特征,为地震数据的处理与解释提供准确的依据.
In order to solve the problems of lacking of seismic wave dynamics information and generating blind spots in complex structures, the Gaussian beam method is applied to the research of inclined-well VSP. Gaussian beam is a high-frequency approximate solution of the wave equation near the ray , Depending on the propagation path of the wave.The energy at the detection point is a Gaussian weighting of the ray energy in the effective half-width near the detector.The skewed-well VSP Gaussian beam forward method is applicable to different geological models while maintaining the relative amplitude of the wave field Characteristics.Gaussian beam forward modeling has the characteristics of high frequency wave field and can be used for thin layer analysis and identification.The problem of dead zone and dynamic characteristics of complex geological model is solved by comparing with the method of progressive iterative forward modeling.The application of oblique well VSP Gaussian beam forward method The forward wave field in W region shows that the method can effectively distinguish the characteristics of seismic wave field and provide an accurate basis for the processing and interpretation of seismic data.