What happens to the empty space after millions of tons of Crude Oil are extracted?

Petrol and diesel are global necessities, and the demand is huge. Approximately 100 million barrels of crude oil are extracted daily from natural gas wells around the world. What happens to the empty space left underground after so much oil is removed?

Crude oil and natural gas are formed from the remains of dead sea creatures. Over time, these remains transform into oil. Since oil is lighter than water, it rises and collects in underground pockets or "wells." When drilling occurs, the crude oil often comes out on its own due to pressure. Once the oil is extracted, the empty space is typically filled by new crude oil or surrounding fluids like water that flow toward the vacuum. Therefore, unlike mining for solid minerals like iron or gold—which leaves behind hollow caves or tunnels—oil wells do not leave empty "holes" because liquids naturally rush in to fill the gap.