basic-open-hole-tools_fig1.png|{{figure number|1}}A typical log showing SP, gamma ray, dual Induction, and sonic measurements. © Schlumberger.<ref name=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.<ref name=Schlumberger1983>Schlumberger Well Services, 1983, Schlumberger Open Hole Services Catalog: Houston, TX</ref> |