直流电阻率法在黄河下游地区地下咸水分布研究中的应用

Application of the DC resistivity method in the study of saline groundwater distribution in the lower reaches of the Yellow River

为研究黄河下游惠民地区地下咸水分布特征,在该区域开展了直流电阻率法测量工作。通过电阻率测井确定区内咸水层视电阻率数值分布范围和咸—淡水界面变化特征,以此约束电阻率测深数据的分析,提高对咸水层分布解释的准确率。结果表明:研究区地下咸水层顶界面埋深主要位于20~50 m区间,局部发育至浅地表;咸水层底界面推断埋深主要分布在160~300 m区间,近似NW走向逐渐变浅。经后期水样调查和钻探验证,推测的地下咸水分布特征与实际情况基本一致,表明直流电阻率法在地下咸水分布特征研究中具有较好的应用效果。

This study investigated the distribution characteristics of saline groundwater in the Huimin area of the lower reaches of the Yellow River using the DC resistivity method.Specifically,this study determined the distribution range of the apparent resistivity of the saline water and the variation in the saline-fresh groundwater interface in the area based on resistivity logs,aiming to constrain the resistivity sounding data analysis and improve the interpretation accuracy of the distribution of the saline groundwater.The results are as follows.The top boundary of the saline water in the area mainly had a burial depth of 20~50 m and developed to the shallow surface locally.It was inferred that the bottom boundary of the saline water had a burial of mainly 160~300 m and gradually became shallow in a nearly NW direction.As verified by the later investigation of water samples and drilling,the inferred saline groundwater characteristics agreed roughly with the actual situation.This result indicates that the DC resistivity method has a good application performance in the study of the distribution of saline groundwater.