Natural gas is the least dense comp

Natural gas is the least dense compound in the reservoir, located above the oil and water.Natural gas, like oil, is extracted from the earth by drilling a well into the reservoir and using tubing to bring the gas to the surface, as illustrated in Fig. 1.12. First, a team of exploration geologists and geophysicists confirms the presence of an oil and gas reservoir under the ground or sea floor. Next, a well is drilled to extract the oil and gas. Sometimes a well is drilled as part of an exploration activity to determine whether geological formation layers contain hydrocarbon or not. This type of exploratory well is called a wildcat. There are various factors that can influence the decision to drill a well, such as whether drilling would be economical, the nature of the geological formations and layers to be drilled, and how far underground the natural gas is located.