Oil and natural gas are found in underground traps. A trap consists of a source rock that produces the hydrocarbons, a reservoir rock that stores the hydrocarbons, and a cap rock, or seal, that prevents the hydrocarbons from escaping to the surface. In this activity, you’ll learn about some important properties of both reservoir rock and the hydrocarbons it contains.
Reservoir rock is any porous, permeable rock, like sandstone and limestone, in which hydrocarbons collect. This activity demonstrates just how much gas and oil these seemingly solid rocks can hold.