Kudryavtsev's Rule
Kudryavtsev's Rule states that any region in which hydrocarbons are found at one level will also have hydrocarbons in large or small quantities at all levels down to and into the basement rock. Thus, where oil and gas deposits are found, there will often be coal seams above them. Gas is usually the deepest in the pattern, and can alternate with oil. All petroleum deposits have a capstone, which is generally impermeable to the upward migration of hydrocarbons. This capstone leads to the accumulation of the hydrocarbon.
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