Caprock

Okay kiddo, have you ever seen a cake with frosting on top? The frosting is like the earth's surface, and everything below it, including the cake, is like the ground underneath our feet. Sometimes, there is a special layer of frosting on the cake that is really hard and doesn't melt easily. This layer is called the caprock.

In the same way, the earth has a layer of rock that is really hard and doesn't let things pass through easily. This layer is called the caprock. It's usually found on top of oil or gas reservoirs. The caprock keeps the oil or gas from escaping to the surface by acting as a lid, like the lid on your favorite jar of jelly!

Now, imagine that you have a straw and you want to drink from the jar of jelly. You can't because the lid is in the way. Similarly, drilling through the caprock to access the oil or gas below is like trying to drink from the jar without removing the lid first. It's not easy!

So, the caprock is really important because it keeps oil and gas underground until humans can drill through it to extract these valuable resources. Without the caprock, the oil and gas would escape to the surface and we wouldn't be able to use it.