List of top Geophysics Questions

Low value in SP log as observed in dispersed shales is mainly due to the impeded movement of:
In Electromagnetic methods of prospecting, which one of the given options is CORRECT about frequency and type of current source for the Primary field used?
In a multi-electrode resistivity tomography (ERT) survey, using equally spaced electrodes, which of the given configurations will provide the maximum number of data points?