Geochemical studies on the organic matter from the Douala Basin (Cameroon)--III. Comparison with the Early Toarcian shales, Paris Basin, France

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Scientific paper

Comparison of source material nature and evolution with burial is made on the sedimentary organic matter from the Lower Toarcian of the Paris Basin and from the Upper Cretaceous of the Douala Basin. The organic matter in the former series derives from autochthonous marine organisms; in the latter series, it derives from allochthonous terrestrial remains. Its soluble part (particularly hydrocarbons) and its insoluble part (kerogen) are successively examined, on both qualitative and quantitative basis. The principal observations concerning petroleum generation are: 1. (1) the ratio of transformation of the organic matter into oil is higher in the series where it derives from marine organisms, than in the series where it derives from terrestrial plants. 2. (2) the oil has a naphtheno-aromatic type in the first case, a paraffinic type in the second case.

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