Study of Tunnel-Face to Borehole ERI (TBERI) Measurement Configurations and Its Optimization

Figure 3

Inversion results of different configurations. (a, d) Schematic diagrams of low-resistivity anomaly models located at different depths; the background resistivity is 1000 Ω·m, and the anomaly resistivity is 10 Ω·m. (b, c) Inversion result of combined A-M + AM and single A-M for model in (a), respectively; the results are similar. However, there is a symmetrical artifact shown in (c). (e, f) Inversion result of combined A-M + AM and single A-M for model in (d), respectively. Obviously, for deep anomalies, the AM data can effectively improve the inversion result.