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11
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1answer
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The youngest and oldest source rock for hydrocarbons in economic quantities

Most famous and productive source rocks for hydrocarbons are Paleozoic or Mesozoic, but there are also examples from the Neogene. Time is needed for the rock to reach the right depth and temperature ...
9
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3answers
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Why is there so much oil in Saudi Arabia, Venezuela and Canada, but almost none in Europe?

Why do some countries have a lot of oil reserves, while some others don't?