Faults - Identification of the Transmissibility Index 1

[smithcjb]

I'm revising Reservoir Engineering for a forthcoming exam. One practice question has stumped me. A brief answer or any help would be greatly appreciated.

"Describe the nature of a partially communicating fault and how pressure data may be used to identify the transmissibility index of such features."

 

[DrillerNic]

It looks to me like a welltesting question- a partially sealing fault haas a characterisitc curve on the late time of a derivative plot (the log-log plot) of a welltest (don't ask me to describe it! )

Having decided upon the partially sealing fault model for the welltest data, the tranissibility index (ie how partially sealing is the fault?) can then be worked out form the correct specialised plot of the data.