Hydraulic fracturing is done on most wells.
Here is an example from Pioneer this year for the planned activities in the year for the Alaskan North Slope.
Note the hydraulic fracturing scheduled from January to mid April, page 2.
http://dog.dnr.alaska.gov/Permitting/Documents/POO_PNRA_Nuna_Exploration_Program_20110919.pdf
OK ...thanks...my oil shale map does not cover Alaska or Hawaii (LOL)