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→Spontaneous potential
===Spontaneous potential===
===Spontaneous potential===
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<gallery mode=packed heights=200px widths=200px>
basic-open-hole-tools_fig1.png|{{figure number|1}}A typical log showing SP, gamma ray, dual Induction, and sonic measurements. © Schlumberger.<refname=Schlumberger1983>Schlumberger Well Services, 1983, Schlumberger Open Hole Services Catalog: Houston, TX</ref>
basic-open-hole-tools_fig1.png|{{figure number|1}}A typical log showing SP, gamma ray, dual Induction, and sonic measurements. © Schlumberger.<refname = Schlumberger1983>Schlumberger Well Services, 1983, Schlumberger Open Hole Services Catalog: Houston, TX</ref>
basic-open-hole-tools_fig2.png|{{figure number|2}}A typical log showing density, compensated neutron, Pe, gamma ray, and caliper measurements. © Schlumberger.<refname=Schlumberger1983 />
basic-open-hole-tools_fig2.png|{{figure number|2}}A typical log showing density, compensated neutron, Pe, gamma ray, and caliper measurements. © Schlumberger.<refname=Schlumberger1983 />
</gallery>
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