Resistivity
Resistivity is defined as the opposition or resistance that a material has to interfere the flow of an electric current.
In the case sedimentary rocks, these contain fluids in their pores that have different kind of resistivities.
A rock pore volume can contain equally oil, gas or water. Oil and gas have a higher resistivity value than water, which allow to detect the presence of hydrocarbons at a well by using resistivity logging tools, for instance.
However, water salinity also affects resistivity in water, and it can a wide range of values. Salty water is less resistivity than fresh water so, it has a lower resistivity value.
In addition to helping detect the presence of hydrocarbons, water resistivity is widely used for the calculation of water saturation, which is a very important value by time of estimating hydrocarbon reserves.
In this resistivity section, you can find thee different equation used to calculate water resistivity:
You can calculate the following Resistivity Equations:
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