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sedimentary, the oil is formed within a source rock formed with high quantities of decomposed vegetation, then a reservoir rock which holds the oil and a capping rock which seals it shut

in addition to this sequence of rocks, certain structures are required to stop the oil escaping, a classic would be an anticline

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12y ago
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14y ago

Petroleum isn't actually rock. It is found in sedimentary rock

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9y ago

The age of a rock does not determine its type. There are examples of all three types of rock dating to the Paleozoic.

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Q: Is petroleum an igneous rock sedimentary rock or metamorphic rock?
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