1. n. [Formation Evaluation]
A log of the resistivity of the formation, expressed in ohm-m. The resistivity can take a wide range of values, and, therefore, for convenience is usually presented on a logarithmic scale from, for example, 0.2 to 2000 ohm-m. The resistivity log is fundamental in formation evaluation because hydrocarbons do not conduct electricity while all formation waters do. Therefore a large difference exists between the resistivity of rocks filled with hydrocarbons and those filled with formation water. Clay minerals and a few other minerals, such as pyrite, also conduct electricity, and reduce the difference. Some measurement devices, such as induction and propagation resistivity logs, may respond more directly to conductivity, but are presented in resistivity.
See: bit resistivity, dielectric propagation log, electrical log, electromagnetic propagation, fresh water, ring resistivity, saturation equation
2. n. [Formation Evaluation]
A log of the resistivity of the formation made by an electrode device such as a laterolog. In this sense the term is used to distinguish the log from an induction measurement, which responds more directly to conductivity.