Gas reservoirs are underground formations that contain natural gas, often found in porous rock layers. These reservoirs can be located deep beneath the Earth's surface and are typically sealed by impermeable rock, which prevents the gas from escaping. The gas is often formed from the decomposition of organic materials over millions of years. Extraction of gas from these reservoirs is done through drilling wells. Once accessed, the gas can be used for various purposes, including heating, electricity generation, and as a fuel for vehicles. Proper management of gas reservoirs is essential to ensure sustainable energy production and minimize environmental impacts.