【摘要】 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.更多还原

【Abstract】 In order to solve the problems of the conventional forward methodsthat lacking of the seismic wave dynamics information and producing blind areasin complex geological model,the method of Gaussian forward is applied into the study of deviatedhole VSP forward modeling.Gaussian beam is the high frequency approximate solution of wave equation along with the rays,and depends on wave propagation path.The energy of geophone is the rays’ energies are Gaussian weighted in the scope of geophone’s effective half width.Deviatedhole VSP Gaussian beam forward method is applicable to different geological structure model, while maintainsthe relative amplitude characteristics of wave fields. Gaussian beam forward modeling has high frequency wave field characteristics,and can be used to analyze and identifythe thin layer;compared with the Piecewise iteration method,it conquers the problems of blind areasin complex geological model and the characteristic ofdynamics.Deviated hole VSP Gaussian beam method is used in W area’s wave field forward,the results show that this method can effectively distinguish the characteristics of seismic wave fields,and provides accurate basis for seismic data processing and interpretation.更多还原