The recent developments bring US to a leading natural gas and oil producer position. The attempts in last 20 years to bring new horizontal drilling and hydraulic fracturing technologies together have developed a success in shale gas and oil production in US; the production volumes has reached to a position to redefine the market. Last estimations are bringing more information about the shale capacities of the major basins of the world. However, the estimates are based on a wide range of assumptions and consequently their results vary in a large scale. In any case, these developments have crucial economic, political and geopolitical consequences on the energy market, petroleum producer and consumer countries and regions. Despite the wide ran...