This paper deals with the geologic history and oil migration in Shinjyo basin as an example of oil fields in inland areas. As a result of studies, it is presumed that Dawa hill would rise in the middle or latest Furukuchi age (Pliocene). The directions of oil migration are strongly influenced by the upheaval of Dewa hill. Mogami oil field which is a major one in Shinjyo basin may be suitable for Gussow's differential entrapment theory of oil and gas. Future investigations must elucidate the original age of each anticlinal structures in Shinjyo basin.
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 480km2. 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.
In the previous paper, it was demonstrated that apparent friction factor of the flow of air-water mixtures in a vertical pipe was expressed by the empirical formula: f=aρb Eq. (1) where f=apparent friction factor ρ=apparent density of the gas-liquid mixtures a=function of the flow rate of liquid and the inside diamter of lift pipe b=function of the flow rate of liquid and the inside diameter of lift pipe When the expriments were undertook by using the apparatus shown in Fig. 1 Cromer and Huntington observed that there are several different types of flow depending upon the conditions presented in a pipe. But I could found the relationship indicated by Eq. ( 1) within the range of the flow rates of water and air injected into the lift pipe in this test. The obtained by the data reported by Babson were plotted in Fig. 6. From this chart I could also found the relationship expressed by Eq. (1) between f and ρ.