Question

what is formation of petroleum

Answer 1

Petroluem was formed from organisms living in the sea . As these Organisms died , there bodies settled at the bottom of the sea and got covered with layers of sand and clay . Over million years , absence of air , high temperature and high pressure transformed the dead organisms into petroleum and natural gas .

Answer 2

$\textbf{Formation of Petroleum }$:

When remains of the dead organisms sank to the bottom of the sea, they get converted by sand and clay.

After millions of years under the combined effect of high temperature, high pressure and bacteria in the absence of air, petroleum forms.

The petroleum so formed passes through porous rocks untill it got trapped between some impervious rocks.