How is oil made in our earth?

Question

Eleanor Apodaca · Accepted Answer

Large amounts of organic matter are buried and trapped between layers of rock. The organic matter decomposes without the presence of oxygen and turns to oil.

During the Mesozoic Era the earth was much warmer overall. There was a high level of #CO_2# in the atmosphere. The combination of warmth and carbon dioxide caused the production of large amounts of organic matter. Due to large geological shift in the earth this organic matter was buried under layers of sediment that turned into hard rock. The organic matter decomposed turning into the hydrocarbons that are called oil and natural gas.

Santiago Arce · Answer

undefined Oil is formed from the remains of tiny marine plants and animals that lived millions of years ago. When these organisms died, their remains settled at the bottom of oceans and lakes, where they were buried under layers of sediment. Over time, the pressure from the overlying layers compressed the organic matter, and the heat from the Earth's interior caused chemical reactions to occur, transforming the organic material into hydrocarbons, which are the primary components of oil. This process, known as diagenesis, eventually led to the formation of crude oil.