Well the unconventional gas figures don't stand much scrutiny so I don't think we should put too much faith in another bunch dealing with unconventional oil reserves.
The most common figure cited for American gas reserves is 2,170 trillion cubic feet (tcf) from the Potential Gas Committee. Which is often said to be a 95-year supply if 2010 consumption figures are maintained.
Of that, 273 tcf are "proved reserves," stuff we are fairly sure is there and can be produced economically. 536.6 tcf are "probable" from existing fields, it probably exists and might be economically recoverable. 687.7 tcf is "possible" from new fields - gas that might be in new fields if and when we find them and might be recoverable. Beyond that are 518.3 tcf of "speculative," gas - the meaning is in the title and 176 tcf for coalfield gas of which 90% has not been proven.
In short the US has 11 years of proven gas, 21 of proven and possible reserves and everything after that is an unknown. And that's not even taking into account the percentage of any gas that can be recovered from a field.
As for the rig counts - does it show there is a huge untapped supply of gas out there? No, it shows that shale needs a lot more rigs than conventional reserves and that shale gas wells are tapped out much more quickly than traditional gas wells.
Oh and some of the operators might have been overstating production and reserves: