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ABSTRACT: Hydrocarbon Potentials of Tertiary Coals in Japan and Northeast China

Suzuki, Yuichiro1, Keizo Fujii2, and Li Sitian3
(1) Geological Survey of Japan, Tsukuba, Japan 
(2) Shizuoka University, Shizuoka, Japan
(3) China University of Geosciences, Beijing, China

Both Japanese coals and Fushun coals in China were deposited in Tertiary coal basin, but they had different depositional environments in each other. Japanese coals were developed near the seashore because their coal-bearing formations are interbedded with brackish or marine stratums. But Fushun coals were deposited in the inland rift basin in Eurasia Continent where was very far from the sea.

Generally coal properties showing by proximate analysis and ultimate analysis are affected with coal depositional environments. After the result of their ultimate analysis, Japanese coals and Fushun coals are plotted the same area on the van Krevelen diagram, which is between type II and type III kerogen evolution pathways. But Cretaceous Fuxin coals, which were deposited under the similar depositional environment as Tertiary Fushun coals, are plotted just on the type III pathway. Jurassic coals in China are also on the type III pathway.

From coal petrological analysis the degradinite, a maceral in the Japanese coal petrogogy nomenclature and similar to liptidetrinite, are determined in Tertiary coals but not in cretaceous coals. Degradinite contents and H/C atomic ratios showed good correlations in several seams in Japan and China. It is inferred that the original plant of Tertiary coals, which were included original matters of degradinite, had higher hydrogen contents than that of Mesozoic coals. Then Tertiary coals have good potentials and some advantages to Mesozoic coals for oil source rocks because of higher hydrogen contents.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia