Archie’s equations

Archie's equations describe how easily an electric current flows through porous rocks, such as underground reservoirs containing oil, gas, or water. They relate the rock’s ability to conduct electricity (conductivity or resistivity) to the properties of its fluids. Essentially, they help geophysicists estimate the presence and type of fluids in underground formations by measuring electrical properties at the surface. The equations account for how different fluids (like water or oil) affect the rock’s conductivity, enabling informed decisions in resource exploration and extraction.