--> ABSTRACT: Pyrobitumen from Hydrous Pyrolysis of Oil and Bitumen: Implication for the Interpretation of Amorphous Carbonaceous Materials, by T. Minamidate, N. Takeda, N. Tsuzuki, M. Suzuki, Y. Kajiwara; #91020 (1995).

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Pyrobitumen from Hydrous Pyrolysis of Oil and Bitumen: Implication for the Interpretation of Amorphous Carbonaceous Materials

T. Minamidate, N. Takeda, N. Tsuzuki, M. Suzuki, Y. Kajiwara

Oil and bitumen samples from various kerogen types were submitted to hydrous pyrolysis. Gas (C1-5), light oil (C6-14) and pyrobitumen (insoluble carbonaceous material) were generated, while oil (C15+) decreased. The maturity attained in experiments were calculated using the maturation model "SIMPLE %Ro".

We examined changes in the amount and quality of pyrobitumen with maturation. The amount of pyrobitumen was larger in samples with abundant resins+asphaltenes, and increased with maturation. The pyrobitumen samples were submitted to Rock-Eval, microscopic observation, reflectance measurement, and laser Raman spectroscopy.

HI, OI and Tmax showed systematic changes with increasing maturity, indicating that Rock-Eval can be a good maturity parameter below 1.75%Ro. On the other hand, reflectance showed poor correlation with calculated %Ro, because of optical anisotropy. Raman to fluorescence intensity ratio increased with increasing maturity, with trends specific to original oil types, suggesting the differences in graphitization.

The experimental results show the possibility of pyrobitumen for assuming (1) the existence of oil in the past (2) the initiation of secondary cracking (3) the migration route of oil (4) the oil type before cracking etc.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995