At a throw of 100 ft, the SGR begins to increase as a sand section begins to move past the fault. The SGR reaches a maximum at approximately 450 ft. The SGR again begins to decrease as a more shale-prone section moves past the fault.
Seal risk is changing as both the displacement and the stratigraphy change. A fault may leak at a displacement of 10 ft, seal at a displacement of 100, leak at a displacement of 450, and seal again at a displacement of 600 ft. A fault will change seal behavior both along strike and dip. A fault will change seal behavior during fault growth.
This SGR-Displacement plot shows the change in SGR as the fault throw increases from 0-1000 ft for the well previously shown (above right).
As the throw increases from zero, the SGR rapidly decreases as a thick shale section moves past the fault.
The SGR reaches a minimum at a throw of approximately 100 ft.