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波恩斯维数据集包含从同一口井获得的两组校验炮测量数据。一个使用可控震源,另一个用爆破震源。两次测量的地表位置不同,其结果包括传播时间和平均速度曲线也有很大差异。公布的资料上对数据的描述是这样的:“在可控震源和爆破震源之间,传播时间存在6～10ms的差异,但对大多数使用该数据的方法而言,这种差异可以忽略”。图1给出了平均速度对标准参考基准面(SRD)以下深度的关系曲线,这是通过把效验炮时间表校正到SRD之下垂向单程时间上直接导出的。很明显,对任何一个解释员,如果想使用校验炮资料建立地震数据和井数据的相关,或绘制一个与井数据一致的深部构造图,这两条平均速度曲线的差异会产生严重问题。
The Bonnville dataset contains two sets of verification gun measurements from the same well. One uses a vibrator, the other uses a blast source. Two measurements of the surface location, the results, including the propagation time and the average speed curve is also very different. The published data describe the data as follows: “There is a 6-10ms difference in propagation time between vibroseis and a blast source, but for most uses of this data this difference can be neglected” . Figure 1 shows the mean velocity versus depth below the standard reference plane (SRD), which is derived directly by correcting the validation gun schedule to the vertical one-way time below the SRD. Obviously, for any interpreter, the difference between these two average velocity curves poses a serious problem for any interpreter who wants to use seismic data to establish the correlation of seismic data with well data or to draw a deep structure map that is consistent with well data.