The discrepancy between basement depths estimated by this means and those indicated by drilling has been on the average no greater than 5 percent . 用这种方法估算的基底深度与钻井探明的深度之间的差别，平均起来不超过5。
2.
Magnetic surveys are useful in oil exploration only for determining basement depths so as to cast light on the existence and geometry of sedimentary basins . 磁力测量在石油勘探中的用途仅仅是为了确定基底深度，以便查明沉积盆地的存在及其几何形态。
3.
The discrepancy between basement depths estimated by this means and those indicated by drilling has been on the average no greater than 5 percent 用这种方法估算的基底深度与钻井探明的深度之间的差别，平均起来不超过5 。
