Electrical conduction in clay bearing sandstones at low and high salinities

Publisher Website
Google Scholar
Abstract
We find the formula σ=φm[σω+AQv/ (1+CQv/σw)] that embodies the fact that the rock conductivity σ is a nonlinear function of water conductivity σw, can fit data on 140 cores rather well with m≊2, A=1.93×m (mho/m)(l/mol) and CQv=0.7 (mho/m). The observed curvature at low salinity is due to an interplay of tortuosity and water conductivity. Empirical correlation shows that m increases with the clay content, as the tortuosity increases with the clay content. Thus, the conductivity of a fully water saturated clay bearing (shaly) sand is completely determined from porosity φ, charge density Qv, and water conductivity σw.

This publication has 30 references indexed in Scilit: