2D Model Study of CO₂ Plumes in Saline Reservoirs by Borehole Resistivity Tomography

Figure 4

Numerical resistivity tomograms (3rd–12th column) inverted for different wedge-like CO₂ plumes (W₁, W₄₂, W₈, 1st-2nd column, see Figure 3) of varying saturations—resistivity of 100 (a) and 10 Ωm (b)—and 4-pole electrode configurations (1st row, see Figure 2 and Table 3 for symbols) between two borehole electrode arrays (●). All models show root mean square errors of less than 1%. Solid lines refer to target boundaries.