| Plot of Reflection Coefficient (ignoring wellbore attenuation) shows |
| how it is insensitive to the controlling fracture dimension (either |
length or height) once this dimension is greater than about 10 meters.
| Once that dimension is greater than 10 meters, the hydraulic |
| impedance of the fracture is so small compared to that of the wellbore |
| that the reflection coefficient is almost -1. |