A Method for Investigating the Effect of Mud Invasion on the Acoustic and Density Logs

M-25 A METHOD OF INVESTIGATING THE EFFECT OF MUD INVASION ON THE ACOUSTIC AND DENSITY LOGS BRIAN A. FARRELLY SVEIN E. JOHNSTAD and REIDAR KANESTRØM Summary 1 In this paper we have demonstrated how wireline logs can be combined with the results of core analysis to investigate the effect of mud filtrate on the density and acoustic logs. The density log is most seriously affected by the mud filtrate but the P - waves are also significantly influenced. The invasion of mud filtrate is related to the permeability. Since the synthetic seismic response is computed from the wireline logs it