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).

Maximum potential for self-potential (SP) log

Input(s)

Output(s)

Formula(s)

Reference(s)

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