What is an oil and gas reservoir?

An oil and gas reservoir is a subsurface geological formation that contains significant accumulations of hydrocarbons, primarily oil and natural gas. These reservoirs are typically found in porous rock layers, where the hydrocarbons can be trapped by impermeable rock formations above, creating a seal. The efficiency of extraction from a reservoir depends on factors like its size, pressure, and the properties of the surrounding rock. Understanding these characteristics is crucial for successful exploration and production in the oil and gas industry.