Maximum potential for self-potential (SP) log
Input(s)
\(R_{m f e}\): Apparent Resistivity of Mud Filtrate (ohm m)
\(R_{w e}\): Apparent Formation Water Resistivity (ohm m)
K: Temperature-dependent Coefficient (Temp. Degree)
Output(s)
SSP: Maximum Potential (millivolts)
Formula(s)
\[
\begin{gathered}
\mathrm{SSP}=-\mathrm{K} \log _{10}\left(\frac{\mathrm{R}_{\mathrm{mfe}}}{\mathrm{AR}_{\mathrm{we}}}\right) \\
\mathrm{K}\left({ }^{\mathrm{o}} \mathrm{C}\right)=61+0.133 \mathrm{~T} \\
\mathrm{~K}\left({ }^{\mathrm{o}} \mathrm{F}\right)=65+0.24 \mathrm{~T}
\end{gathered}
\]
Reference(s)
Ramey Jr, H. J. (1981). Reservoir Engineering Assessment of Geothermal, Systems. Department of Petroleum Engineering, Stanford university, Page (4.5).