Determining lithology from well-velocity surveys

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Problem 5.7

By comparing the velocity-depth relations in Figures 5.6a and 5.7a, what can you deduce about the nature of the rocks in the well for Figure 5.7a?

Figure 5.7a.  Plot of well-velocity survey.

Solution

We superimpose the sand-shale curve from Figure 5.6a on Figure 5.7a (the dashed line) and note that the data are nearly parallel. It appears that the geologic section represented by Figure 5.7a is normally pressured, mainly clastics, and has not been uplifted significantly (i.e., the velocity is about what is expected for normal compaction).

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