Question

Which log represents the type of strata existing at different depths and encountered during digging or boring of the wells?

(a) Well logs

(b) Resistivity logs

(c) Radiometric logs

(d) Sonic logs

I had been asked this question in an interview for job.

The query is from Tube Well-2 topic in section Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

Answer 1

The correct choice is (a) Well logs

For explanation I would say: Resistivity logs indicate the values of the electrical resistivity of rocks at different depths. Sonic logs indicate the value of the velocity of compressional waves at different depths. Radiometric logs indicate the variations of radioactivity with depth.