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

Figure 3

Subsurface model scenarios of saline sandstone reservoir (resistivity, 𝜌 = 3 Ωm) with CO₂ wedge-like plume of varying width (𝑑), thickness (ℎ), depth and saturation (80, 60, 40, and 30%, i.e., 𝜌 = 100, 30, 15, and 10 Ωm, resp.) capped by siltstone (8 Ωm) together with borehole electrode arrays (●) used in the survey. 𝑑₁, 𝑑₂, ℎ₁, ℎ₂ are given in units of electrode spacing 𝔞.