Calculate Water Resistivity (Rw) - SP Log

💻 Optimized Version 📱

List of equations assignment

Water Resistivity (Rw)- SP

Water resistivity (Rw) can also be calculated from the spontaneous potential (SP) well log. This equation needs the values of mud filtrate resistivity, an SP measurement, and a constant K that depends on the formation temperature. The equation is the following:

Where:
• Rw = water resistivity
• Rmf= resistivity of mud filtrate at formation temperature
• K= constant
• SP= SP measurement

Calculate Water Resistivity (Rw) - SP
K:		Rmf: ohm-m
SP: mV

Constant K

For the calculation of constan K, formation temperature has to be known, and the expression is the following:

Where:
• Tf= formation temperature

Calculate Constant K - SP
Tf: °F

Made by Henry Herrera