Formation of Petroleum and Natural gas Video Lecture - Class 8

where do we get oil from the Earth's
surface millions of years ago was
covered with more water than water does
today and living in this water were
billions of tiny plants and animals when
these plants and animals died they fell
to the ocean floor and piled up sand
from eroding rocks and mud covered them
up these layers of sand and mud were
heavy and this weight turned them into
sedimentary rocks heat from the earth
and the weight of the rocks caused the
dead plants and animals to compress into
oil
once the oil is formed it slowly moves
up through pores in the rocks however in
some cases rocks without any pores leave
oil trapped underground oil is found in
different parts of the world the places
where oil is extracted are called oil
fields more than half of the world's oil
is produced in the Middle East to get to
the oil an oil company must first drill
down to it a rake is set up to support
the drill then a well is drilled into
the ground until the oil is reached if
the oil field is in the sea then
offshore rigs are used