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Why are oil rigs in the middle of the ocean?

We put the rigs where the oil is!

There aren’t any rigs in the “middle” of the ocean, but it is fairly common to find major oilfields over 150 km off the coast. This happens because:

  • Shallow seas often had the correct conditions for oil formation millions of years ago. Specifically, something like an algae bloom has to die and sink into oxygen-free conditions on the sea floor, then that organic material gets buried and converted to rock over geologic time.
  • The continental shelf downstream of a major river delta is a great place for deposition of loose, sandy sediments that make good oil reservoir rocks.

These two types of rock — organic-rich source rock and permeable reservoir rock — must be deposited in the correct order in the same place for there to be economically-viable oil reservoirs. Sometimes, we find ancient shallow seas (or lakes) on dry land. Sometimes, we find them underneath modern seas. In that latter case, you get underwater oil and offshore oil rigs.

In the “middle” of the ocean, the sea floor is primarily basaltic crust generated by volcanic activity at the mid-ocean ridge. There’s no source of sufficient organic material for oil source rock or high-permeability sandstone for reservoir rock. So there is no oil. Which is fine, because the water is too deep to be very practical to drill on the sea floor anyway. (Possible, but not practical.)


This information was taken from Quora. Click here to view the original post.

Have you known about this before? Do you think oil rigs should be be located in the ocean?

#Geography #Society #Quora

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What are your thoughts on this subject?
23 Comments
lxixwithu
The first sentence says it all: We put the rigs where the oil is!
14
Jun 26, 2018 6:32PM
tbear
lxixwithu, makes sense! Thought the same as you! 👍😊
0
Sep 3, 2021 6:39PM
kenheeke
If you wanted to walk everywhere you go they wouldn’t have to look on the ocean floor
1
Jul 18, 2019 7:23PM
Mireille Hance-Truman
Evident answer.
0
Jul 12, 2019 4:56AM
Charlie Bridges
Satish Chandran, Not really.Ever been on a platform? There are usually an ecosystem!
1
Apr 17, 2019 3:54PM
Pamela Spallin
No comment. Everybody always has a solution to everything
1
Feb 18, 2019 11:33PM
Dixie Rose
Guess they never heard of directional drilling... Don't have to be right on top field ad can drill 360 any direction. Only limitation is pipe length and that isn't much of one, or hitting dry hole.
0
Dec 30, 2018 4:50PM
Satish Chandran
marine life is destroyed,sea gulls have to find finger chips;
2
Dec 20, 2018 7:19PM
Alireza Mohtashami
Bad question
1
Dec 15, 2018 2:57AM
Jim Rivera
Misleading title.
0
Oct 29, 2018 9:37PM
Deena Grady
Too bad they still do it == based on the horrendous disasters from previous oil spills, including the BPP in the Gulf of Mexico not that long ago. I believe there is a more recent one up by Norway also, albeit a different company.
0
Oct 29, 2018 5:33PM
Diane Decary Ross Shandley
Definitely interesting.
0
Oct 11, 2018 5:09PM
bradfieldscottv
D'ya think?
0
Oct 10, 2018 8:19PM
Raquel Torcuator Figueroa
I agree..we put the rigs where the oil is .
0
Oct 10, 2018 7:58PM
ninakamwene
Dah! The trivia answered itself. We put rigs where oil is! The knowledge was excellent. "Tank" you
2
Sep 24, 2018 8:56PM
Norm Pontes
And on it goes, we constantly complain but constantly use oil and we have no idea what byproducts are made from oil, not just gasoline, take the time and research it you will be blown away
0
Sep 4, 2018 7:25PM

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