3.2.3. Electrical Resistance

Figure 11 shows the normalized electrical resistance (*R*/*R0*) during the depressurization process. The results of the electrical resistance measurements indicated that CO2 intruded the upper part of the cell. For layers B1 and B2, electrical resistance exhibited complex behavior due to the formation of CO2 hydrates and the movement of CO2 gas bubbles. However, the electrical resistance decreased generally because of CO2 dissolution. As stated before, electrical resistance of distilled water-saturated sediment decreased with CO2 intrusion because of dissolved CO2. Meanwhile, the electrical resistance of the lower part of the cell (i.e., layers B3 and B4) was barely affected by depressurization because the pore water of the lower part of the cell was already saturated by dissolved CO2.

**Figure 11.** Normalized electrical resistance *R*/*R0* of the unconsolidated sediment sample during depressurization. (**a**) layer B1, (**b**) layer B2, (**c**) layer B3, (**d**) layer B4.
