Now that I've finished travelling, I'll try to add a little more to my answer. Firstly, I will refer you to an earlier thread I posted about Australian natural gas
reserves. You can see that Australian gas production should last until about 2030.
Regarding the price, I found quite by chance this
article, which sheds more light on the matter.
The Quiet Energy RevolutionNatural gas and natural gas markets, however, are different. Ethereal and highly flammable, natural gas poses significant transportation problems. A tanker ship can’t simply fill up and shove off. For this reason, there has been no single global market for gas, but a number of balkanized, regional markets all over the planet. The price of natural gas in one region has little connection to the price in another, and for many years regions facing shortages could not be relieved by gas from regions with excess capacity.
That is changing, not as rapidly as the shale gale has transformed America’s gas picture, but still rapidly compared with other business transformations. The reason is liquefied natural gas (LNG). Innovations in liquefaction and re-gasification technologies allow gas to be condensed to 1/600th its size, which then can be shipped by sea. Major infrastructure investments by energy companies and governments, along with the development of specially designed double-hulled tankers to transport LNG, are creating a robust, integrated market for natural gas.
The implications are profound and largely positive. The new mobility of LNG will bring a sorely needed measure of market stability after the past five years of unpredictability in price and supply.
LNG, along with the shale gale, should help keep natural gas prices low for a long time.
Does this answer your question?
Human history becomes more and more a race between education and catastrophe. H. G. Wells.
Fatih Birol's motto: leave oil before it leaves us.