Yuni plain and Umaoi hill situated in the eastern region of the Ishikari depression of central Hokkaido, are oil explorating fields with an area of about 480km
2.
These are one of the differentiated oil bearing sedimentary basin at Neogene Tertiary age and also its are composed of the Paleogene and Cretaceous sediments seem to be deposited along the steep side from the hinge line on the basin position of the Yezo geosyncline.
This paper describes its characteristics of folds and faults based on a completed subsurface stracture map by the data of field geology, seismics and well logs. Also the paper introducess its properties of new found unconformity on the base of Oiwake group.
From the oil possibities of this region and general information on habitat of oil in the sedimentary basin, the author concludes that more attention should be paid to the oil exploration of the cretaceous formations of the hurried deeper structures found at Yuni Plain.
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