Fig. 16.24 Recognition of shale compaction and overpressure in shale sequences using the formation density and sonic logs.
(Adapted from Mondol et al. 2008)
Fig. 16.23 The gas effect in the neutron-density crossplot shows large negative separation in reservoir zone. On the other hand
large positive separations occur in shales (top and bottom of the reservoir). (Modified from Rider 2004)
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(Adapted from Mondol et al. 2008)
Fig. 16.23 The gas effect in the neutron-density crossplot shows large negative separation in reservoir zone. On the other hand
large positive separations occur in shales (top and bottom of the reservoir). (Modified from Rider 2004)
16 Well Logging: Principles, Applications and Uncertainties
409