以自然电位测井确定第三系与第四系分界初探

A TENTATIVE PROBE ON THE BOUNDARY BETWEEN TERTIARY AND QUATERNARY BY SELF-POTENTIAL LOG

本文以下辽河平原测井成果为实例,论证了新生代晚期地层自然电位产生机制,利用地层界面自然电场在电场强度和异常形态方面的特征与差异为划分界面的标志.以此确定第三系与第四系分界的问题.

According to the log results from the lower-Liaohe River plain, this paper discusses the mechanism of self-potential formation in the late Cenozoic strata, puts forward that the self-electric field is mainly controlled by the adsorptive electromotive force and oxidation-reduction electromotive force, and summari-zes self-electric field differences between Tertiary and Quaternary in electric field strength and abnormal form. These differences can serve as the boundary mark. So, it is feasible to determine the boundary of Tertiary and Quaternary by self-potential log.