Recent technological advances have allowed for economically viable extraction of unconventional forms of gas. Unconventional forms of natural gas including shale, tight gas, and coalbed methane, generally occur in lower concentrations over larger areas compared to conventional gas reservoirs, making it difficult to extract. Currently, shale gas production is predominately limited to the United States, where it continues to grow rapidly. Shale gas was primarily responsible for the increase in gas production in the United States between 2010-2011. Noting the success of shale in the US, many other countries, including Egypt, are now considering the possibilities of tapping their own unconventional resources.