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本文引入了一种VSP速度估算方法——基于双曲线校正的VSP速度分析方法,它将VSP记录沿反射波射线路径按时间外推成地面地震记录,然后利用上行波,按地面双曲线公式,给定一系列叠加速度,在共炮点道集内进行速度扫描,制作叠加速度谱,然后根据动校正结果的好坏,来估算地层的均方根速度.这种方法与常规的利用下行直达波计算速度相比,可以获取视观测井段以下的地层速度,并且获取的速度与地面地震的叠加速度一致,有机地将VSP与地面地震结合起来.
This paper introduces a VSP velocity estimation method based on hyperbolic calibration of VSP velocity analysis method, which records the VSP records along the reflected wave ray path extrapolated to the ground seismogram by time, and then uses the upward wave, according to the hyperbolic formula of the ground, Given a series of superposition velocities, the velocity sweeps were made in a common shot gathers, the superposition velocity spectrum was produced, and then the RMS velocity of the formation was estimated according to the result of the motion correction. This method is similar to the conventional method Compared with the calculated velocities, the formation velocities below the visual logging interval can be obtained and the velocities obtained are consistent with those of the surface earthquakes. The organic combination of the VSP and ground-based earthquakes can be obtained.