You can probably find an estimate peak date for gas in tha ASPO figures (
www.peakoil.net). Going from memory it should be sometimes round 2020.
My understanding is however that one issue with gas is that it is not as easy/cheap to transport via ship as for instance oil becasue it needs to be converted to liquidid and then back to gas again.
So gas issues may arise in local areas even if peak extraction hasn't been reached.
i.e. most of Europe should be OK as long as Russia provides gas through pipe, but US for instance needs to ship in whan ever they can't produce locally or get from Canada and this will further drive up costs.
GB I guess needs to import liquified gas as I guess there isn't any pipe line across the channel.
Furthermore, as Oil goes up in price, more countries are looking to diversify into amongst other gas.
This conversion may result in earlier gas peak date and higer costs along the way.
Did I get it right? Anyone who knows more about this?