Mechanism of Forming Low Resistivity in Shale Reservoirs

Figure 15

Relationship between water saturation and resistivity of shale penetrating low-resistivity lamination. It is observed that the water saturation in the rock matrix is no longer the main effect on the resistivity, and the functional relationship has been destructed by the lamination length. When the water saturation in the matrix pore is 40%, the rock resistivity in the low-resistivity lamination with different widths should be any resistivity from 5.0 Ω·m to 18.0 Ω·m. Consequently, it is hard to identify the water saturation in shale only through the resistivity when the lamination framework cannot be predicted in advance.