Hydrogeological Applications of Electrical Impedance Tomography

摘要

Wherever a process generates a sufficient contrast in ground resistivity (OMEGA), monitoring the OMEGA structure over time (traingle openOMEGA/traingle open t) may give insight into these processes. Electrical Impedance Tomography (EIT) has applications in Enhanced Oil Recovery (EOR), Slurry Fracture injection (SFI), and hydrogcological transport process monitoring. Surface-obtained EIT image resoltuion is usually poor. Given the same excitation current and ground factors, there are three approaches to improving image resolution: i.) Increasing measuring instrument accuracy and precision, ii.) Optimizing electrode arrangements with respect to the OMEGA anomaly, and, iii.) Processing data with methods that eliminate noise and improve the Q-distribution map resolution. We examined these approaches for a field experiment near Cambridge. Ontario. Results show that EIT can be used to monitor such processes, but improvements in commercially available instruments are badly needed.