Rebound Salinity

Experimental data at two observation wells. During the storage period, we observed a rebound of salinity (as fluid electrical conductivity) (a, d); concurrently, the bulk conductivity data from electrical measurements at the same locations show little change (b, e). The relation between the bulk electrical conductivity measured by the geophysics and the fluid conductivity measured by the chemical sampling thus appears hysteretic (c, f). Injection was from 0-5 days, storage from 5-7 days, and recovery from 7-10 days. (Singha and others, 2007b)