• The Korean Journal of Petroleum Geology
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• v.14 no.1
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• pp.53-62
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• 2008

Seismic interpretation was carried out based on biostratigraphy of Fukue-1 well in Japan side of the Domi Basin and compared with the Cheju Basin and Tertiary basins in north-west Kyushu. East China Sea Basin including Domi Basin began to develope in the latest Cretaceous$\sim$Paleocene related to rifting. The basin was filled with a thick package of syn-rift sediments during Paleocene to Oligocene and was under post-rift stage effected by transtenssion during Miocene. Previous studies suggest that the basin had been mostly filled with Miocene formation (>3 km), but the Miocene formation is interpreted to be comparatively thin in this study. The thickness of the Miocene formation varies from tens of meters to hundreds of meters and become thicker to the south-west of Cheju Basin. The index taxa of the Oligocene$\sim$Eocene nannofossils and dinoflagellates found in the Cheju Basin and Tertiary basins in north-west Kyushu also corroborate the result of this study.

• The Korean Journal of Petroleum Geology
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• v.14 no.1
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• pp.63-73
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• 2008

The seismic interpretation was carried out to understand the evolution of the Sora and North Sora Sub-basins, South Sea of Korea. Both sub-basins belong to the Domi Basin, which is located in the northeastern margin of East China Sea Basin with Fukue Basin of Japan. Age assignment of each strata in this study was based on the data of boreholes and seismic interpretation in NW Japan. Four regional horizons were identified, and five geological units; Y(basement), Q(Eocene$\sim$Middle Oligocene), M(Middle Oligocene$\sim$Early Miocene), L(Early Miocene$\sim$Late Miocene) and D(Late Miocene$\sim$Present) groups in ascending order. Structural trends of the main boundary faults and the basin-fill sediment are different between the Sora and North Sora Sub-basins; i.e., trend of the main boundary-faults, dip of horizons, distribution of basin and development of growth fault. These results imply that the Sora Sub-basin would have opened earlier than the North Sora Sub-basin.