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100 Reservoir Geology
Figure 6.3 Depositional environments, sand distribution and GR log response.
6.1.2. Reservoir structures
As discussed in Chapter 3, the earth’s crust is part of a dynamic system and
movements within the crust are partly accommodated by rock deformation. Like
any other material, rocks may react to stress with an elastic, ductile or brittle
response, as described in the stress–strain diagram in Figure 6.4.
It is rare to be able to observe elastic deformations (which occur for instance
during earthquakes) since by definition an elastic deformation does not leave
any record. However, many subsurface or surface features are related to the other
