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Laboratory experiment of electrical resistivity measurement under in situ pressure and temperature conditions is essential to precisely interpret the DC resistivity and electro-magnetic survey and logging data. We constructed a resistivity measurement system under confining and pore pressure control, and examined the pressure dependence of electrical resistivity of rocks. Electrical resistivity of four sandstone and two igneous rock samples saturated with 35 g/L NaCl solution were measured under different effective pressure conditions (maximum 80 MPa with pore pressure of 1 MPa). We also estimated geometric change of pore space by measuring the drained pore water volume under confining pressure. The result showed that pore water in all the samples were drained with increasing pressure, and at the same time resistivity were increased. Resistivity changes of sandstone samples were highly correlated with changes of pore water volume, which directly indicates the strong relationship between resistivity increase and closure of pore space under pressure condition. Pressure dependence of resistivity was different among the rock types. Rapid increase of resistivity at low confining pressure (~10 MPa) might be caused by closure of microcracks in igneous rocks. Resistivity changes of sandstone samples possibly depended on the shape and size distribution of pores, and their deformation characteristics.

Electrical resistivity measurements of rocks under confining pressure condition