在地球物理勘探早期,常常认为研究底土的电极化作用,能探测到油田。然而,弱的信噪比限制了以此为依据而发展的矿产勘探瞬变法的应用;直到野外仪器和计算机处理技术得到如此的改进,以致允许再次指向原先的目标。 In the early days of geophysical prospecting, it was often thought that the electrical polarization of the subsoil could be exploited to detect oil fields. However, a weak signal-to-noise ratio limits the application of transient mineral prospecting methods developed on the basis of this; until field instrumentation and computer processing techniques have been so modified as to allow redirection to the original target.