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Crude oil and gas is usually contained in three types of sedimentary rock:

  1. Type 1: formed from algal remains; generates waxy crude oil
  2. Type 2: formed from marine Planktonic and bacterial remains; produces both oil and gas.
  3. Type 3: formed from terrestrial plant material that has been decomposed by bacteria and fungi under oxic or sub-oxic conditions; generate mostly gas with light oils. Coal is Type 3 source rock.

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Q: What kinds of rocks usually contain crude oil and natural gas?
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