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共转换点道集的抽取是三维转换波数据处理的重要环节,道集抽取的正确与否受多种因素影响,其中地层倾角的变化能够引起共转换点道集的抽取误差,表现在炮点、检波点的数量与位置的错选。以地层倾向120°,某转换点垂向深度600m,纵横波速度分别为2 500m/s、1 250m/s的单层倾斜模型为例,利用姚陈提出的倾斜界面三维转换波CCP位置计算方法,对地层倾角分别为0°、5°、20°、30°时的炮点、检波点进行统计,确定其对该转换点的贡献情况,结果表明:倾角CCP抽取方法与目前常用的水平界面假设算法计算出的炮点、检波点分布存在很大差异,忽略倾角因素影响将导致不正确的道集叠加,给后期解释带来极大误差。
The extraction of co-conversion point gathers is an important part of the three-dimensional converted wave data processing. The correctness of the gathers is affected by many factors, of which the variation of dip angle can lead to the extraction errors of the common point transition set, , The number of detection points and the location of the wrong election. Taking the single layer tilting model with formation orientation of 120 °, vertical transition point of 600m, and P-wave velocities of 2 500m / s and 1 250m / s as an example, the method of calculating the position of three-dimensional converted-wave CCP , Statistics were made on the shot points and detection points when the dip angles of strata were 0 °, 5 °, 20 ° and 30 ° respectively, and the contribution to the transition point was determined. The results show that the method of declination CCP is similar to the commonly used horizontal interface Assuming that the algorithm calculates the distribution of shot points and detection points, there is a big difference. Ignoring the influence of the tilt factor will result in the incorrect stacking of the track sets, which will bring great errors to the later interpretation.