By what means can hydrocarbons easily be detected in petrophysics?

Difference in Caliper size
RHOB and NPHI values being the same
Big difference in LLS, LLD and MFSL readings
Gamma ray readings seperating
Well logs measure different physical properties of the subsurface strata. Resistivity is measured very close to the tool (MFSL), at shallow depth from the tool (LLS) and at deep depths (LLD). If there is a big difference in the resistivities it means that the deeper formation contains hydrocarbons which have very high resistivity.
Aleksandar Maričak
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Very interesting!
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