Figure 5. Sonic log responses in shale and drilling mud used in a well (Shell West Foreland No. 1, Section 21, T.8N, R.14W.), drilled in west foreland area, Alaska
Figure 5. Sonic log responses in shale and drilling mud used in a well (Shell West Foreland No. 1, Section 21, T.8N, R.14W.), drilled in west foreland area, Alaska