As home to supermajors, as well as a plethora of smaller, independent energy players, the US boasts one of the largest concentrations of energy personnel in the world. With its insatiable appetite for energy resources, the United States is the world's single largest consumer of oil, using as much as 20.73 million barrels per day as of 2008. Recently, interest has peaked in the vast quantity of untapped natural gas resources in the US, the reserves of which were inventoried in 2008 at 238 Tcf, with producers specifically targeting the nation's promising shale formations for this energy commodity.
Wireline logging is used to obtain a record of the geophysical properties of a formation. This data is obtained by lowering a logging tool into a well on the end of a wireline (an electric cable with the ability to transmit data). The data gathered by the logging tools helps to better understand the capabilities of a well and to help make decisions about drilling or production operations.