GENERAL GEOLOGY

Detailed explanation-1: -Petroleum, also called crude oil, is a fossil fuel. Like coal and natural gas, petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria.

Detailed explanation-2: -Oil and natural gas are formed underground, over several to tens of millions of years, from prehistoric organisms decomposed by high subterranean heat and microorganisms. Oil and gas collect in formations underground, where they are prone to accumulate, to form oil/gas fields.

Detailed explanation-3: -Petroleum and natural gas are formed from the dead remains of marine organisms that were buried under the sea. High temperature, high pressure, and absence of air over million of years transform these dead organisms into petroleum and natural gas.

Detailed explanation-4: -Petroleum (also known as crude oil or simply oil) is a fossil fuel that was formed from the remains of ancient marine organisms.

Detailed explanation-5: -Similarly, oil and gas are formed when organic material is deposited in deep marine sediments. In marine deposits the organic material is mostly phytoplankton, microscopic animals that convert sunlightinto energy.