Name: How Did So Much Oil Get Trapped Under The Ocean?
Uploaded: 2021-04-16T07:25:30.000Z
Duration: 4 min 41 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Oil seems to pop up everywhere, in shale, under deserts and plains, and of course, underwater.

But if oil is a "fossil" fuel, how did those fossils get under the ocean?

Scientists don't really 100 percent know where it came from or how it got underground, but

because we know about plate tectonics we at least have some ideas of how it got under

It comes from dead things, especially when there are a lot of them gathered in one place.

It's true that oil famously comes from deserts like on the Arabian peninsula, but that location

Roger N. Anderson of Columbia University told Scientific American, "Plate tectonics determines

Because the Earth's surface is constantly changing and shifting, oil can end up in all

It helps to understand how oil is made first though.

Hundreds of millions of years ago, organic material (prehistoric plants and animals)

accumulated at the bottom of oceans, rivers, swamps.

Think of it this way, the ocean is deep, and when things die at the top, they can sink

When that happens a lot, they'll pile up!

Living things are made of proteins, carbohydrates, lipids (or fats) and lignin (woody polymers).

When these decomposing organics become compressed under more and more material, in an anoxic

Essentially, the organic matter had to die and quickly find it's way to a place without

Oceans are great for this because the seafloor is not very oxygenated.

At that point it breaks down SUPER slowly, so more and more dead stuff can build up and

Eventually, the pressure of all that material forces the water out; the proteins, lignin

and carbs break down; and all that is left is a lipid, sugar, and amino acid ooze.

Occasionally, this happens near enough to a crack in the crust that it can become trapped.

Then, by adding heat and pressure (something geology and plate tectonics is great at),

this mix of decomposed organisms become subject to chemical reactions, forming what's called

Over millions of years and with more heat and pressure it goes through catagenesis where

the kerogen cooks into hydrocarbon chains.

Humans then look for telltale signs of the these deposits.

When that happens though, it doesn't form a giant lake or pool under the ground; it's

actually stuck in the pores of surrounding rocks, like water clinging to a windowpane.

The immense pressure of the Earth's crust can keep the oil trapped under solid rock,

but if an oil well pushes through it at the right place -- the oil can gush out in a tower

Companies can then take this and make petroleum!

The more we understand about where ancient seas and forests were, the better scientists

can predict where oil is trapped in Earth's crust today.

So, because oceans are great at providing the perfect conditions of low oxygen and high

pressure, AND it's where a lot of this decomposing organic animal and plant matter accumulates…

oil could be anywhere there used to be an ocean.

As the Earth's crust is constantly shifting, the locations of these ancient oceans have

moved too -- scattering oil across the planet; 70-percent of which is covered by water -- so

there's likely a lot of oil trapped under there!

Deepwater Horizon -- could reach 10,000 feet to the ocean's floor, and then drill over

30,000 more feet into the rock to extract the oil.

The tallest building in the world, the Burj Khalifa, is only 2717 feet.

In the end, we think oil got down there because the Earth is constantly changing.

What was once under the ocean is now on top of Mt Everest -- they have undersea fossils

And what was once on top of the world, is now at the bottom of the sea.

We'd like to thank our sponsor for this episode for helping support DNews today: Deepwater

Check out Deepwater Horizon, based on a true story.

After learning all about oil, maybe you're curious about how we take uranium and we turn

Are there other processes you want to know about?

What do you want to know about the world around you?

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How Did So Much Oil Get Trapped Under The Ocean?

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