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在三维地震勘探中,既有纵测线观测又有非纵测线观测。两种观测系统的共中心点时距曲线和迭加速度是不相同的,迭加后的t_0时间也有一个时差存在。此时差与地层倾角、测线与地层倾向线间的夹角、测线与炮检线间的夹角、炮检线与倾向线间的夹角以及非纵距和最大炮检距等因素有关。因此,在设计三维观测系统时应认真考虑这些因素。
In 3D seismic exploration, there are both in-line and non-in-line observations. The centroid point-in-time curves and superposition velocities of the two observing systems are not the same, and there is also a time difference at t_0 after the superposition. The difference between this time and the dip of the strata, the angle between the survey line and the dip line of the formation, the angle between the survey line and the survey line, the angle between the survey line and the dip line, and the factors of non-longitudinal and maximum offset . Therefore, these factors should be carefully considered in the design of 3D observation systems.