Sinking Petroleum, Floating Water

All of us know petroleum, it is a light, oily, black substance which crudely does not have any use, unless refined.
It's formed in the sea, or seabed, where dead sea organisms sink. And, if so, why does a dead organism sink. How extraordinary can this be! We know that dead organisms are supposed to be floating, yet here in the sea, they sink. Is it because fishes have a lot of water content in them?
If you ask Google, it'll show you results mostly, or only about dead, floating fish, and finding a sinking one would be a needle in the haystack.

If anyone has witnessed a sinking fish, do comment, and please express your synopsis.

But something very funny, is that you in many times, don't see floating fishes in the sea, and when you do, there are a million fish floating. But that's only in the Dead Sea (not literally).

Now coming to petroleum. If fish don't sink then how is petroleum found. If fish do sink, then after the complete production of petroleum, why doesn't it try to escape from the depths in the water?
There must be some petroleum fountains, here and there in the sea, wouldn't it, and signs of petroleum killing fish (like in oil spills) may not always be the fault of humans.

Let's Visualise:-

Deep in the sea, we see a black, very black substance suddenly leaking out from the sea bed, rapidly climbing, and the rocks around that little stream begin to give way, moving aside for more and more of the black substance to shoot up. Up there in the surface, we can see it is now actually looking colourful, because of the dispersion of light. Along with the black substance comes bubbles, bubbles which smell really weird or even familiar.

What we can infer from this:-

The black substance, which floats on water, oily and opaque, is petroleum.
The bubbles are petroleum gas or LPG. It's familiar, because it's used as a fuel in many places.
In the surface, the petroleum looks colourful because light disperses when it touches petroleum.

Petroleum is made by the compression of dead sea organisms, which over the years, go under layers and layers of pressure, thus heating it up, cutting off the supply to water, and transforming the organisms, to what we call petroleum. It wouldn't really be unnatural if you see petroleum in the sea out of nowhere, but after all, this is quite a rare sight.

Why? Why doesn't, or why can't petroleum form that much of pressure? And if fishes sink, than why doesn't petroleum sink? Does it take this long for fishes to turn in to floating substance, later being lighter than where fishes swam? Doesn't this phenomenon look interesting?

Somehow, if you check the internet, read books, we really can't find some information, which only people have, and that valuable info dies with them.
Let's bring this out, and please express what you know about this phenomenal happening, daily in the world.
You can tell it out be commenting in the box below.

Have a nice day!
Aditya

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