DC GEOELECTRIC SOUNDING TO DETERMINE WATER CONTENT IN THE SALT MINE ASSE (FRG)*

Abstract

ABSTRACT In the course of investigations concerning disposal of radioactive waste, DC‐geoelectric soundings were performed in the salt mine Asse in 1982. The survey resulted in the determination of resistivities of various salt formations. A comparison of various resistivities obtained in salt formations in the mine shows that it is possible to estimate the content of free water in salt using Archie's equation. The significant result of this survey is that salt formations in the mine can be divided into two categories according to their resistivities: 1. Salt with resistivity between 10 7 and 10 8 Ωm (particularly Na2Sp and Na3β). The particularly pure halitic formations are to be found within this resistivity range. 2. Salt with resistivity between 10 3 and 10 5 Ωm (Na2Tl, K2, transition salt). The salt formations with thin layers of anhydrite and a high content of hygroscopic salts are classified in the paper.