Computer-linked nuclear magnetic logging tool and method having a series of sham polarizing cycles for rapidly dispersing components of residual polarization associated with a prior-in-time NML collection

A method is described for reducing the effects of both precessing and non-precessing residual polarization in nuclear magnetic logging (NML) operations so that a series of collection cycles normalized to a common depth interval can be carried out more swiftly and accurately than in conventional NML operations. The common depth interval lies within an earth formation penetrated by a wellbore adjacent to NML polarizing and detection circuitry positioned within the wellbore under control of NML computer-linked controller and recording system at the earth's surface. The entrained fluids with the common depth interval repetitively polarized with a polarizing field (B/sub rho/) of relatively high strength at an angle to the earth's field (Be/sub e/), and after the polarizing field has been cutoff, NML signals from precessing protons of fluid nuclei within the formation are detected