Algae types of oil source rocks in northern Thailand are dominated by Alginite B or lamaginite which form as thick bands of oil shale. Alginite A or Botryococcus or Botryococcus related are usually found disseminated throughout the oil shale bed. Pila algae was found to be the most abundance through out the Tertiary oil sources whereas other Botryococcus related were found at limited environment. However, Botryococcus brownii seems to be restricted to temperate climate. Reinschia is also restricted to the shallow edge of lacustrine. In most of oil shale those associated with coal bearing formation, suberinite, resinite and sporinite are also the source those contributed hydrocarbon more than those of cutinite.

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