The writer describes the Tertiary stratigraphy, tectonic features, and oil and gas potentialities of the Kamogawa district, covering the eastern terminal part of the "Tanzawa-Mineoka Uplift", in the Boso Peninsula.

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The purpose of this paper is to discuss the possibility of catalytic actions of acid silicates in the process of formation of petroleum in the Japan Sea side of Japan. Mineral compositions of clay fractions of 76 specimens collected from source rocks of petroleum in this region are analysed by means of the X-ray spectrometer. As to the composition of organic matter in these specimens, contents of the total organic carbon, and amounts and liquid chromatographic compositions of the arganic matter extracted by the mixture of benzene, alcohol and aceton (50: 25: 25) are determined.
There is found no definit relation between the catalytic activity estimated from the clay mineral composition and the composition of organic matter, especially the ratio of light fractions (paraffin, cycloparaffin and aromatics) to the total organic matter extracted.
It may be concluded that the clay minerals were placed in inactive conditions during the period of formation of petroleum in this region. The genesis of petroleum and the variability of its com position are assumed to be largely due to the direction and degree of decomposition of the original organic matter in the period of its deposition.

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The investigation was undertaken in order to study the characteristics of correlation factor in gas lift well. The well used in the tests was 6 inches in diameter and 47 meters in depth. Compressed gas was injected into the annular space between casing and gas pipe. Air-water mixtures flowed out through gas pipe (see Fig. 1).
Plot of f factor vs. the product of the inside diameter of lift pipe and mass velocity of the fluid flowing in the lift pipe is shown in Fig. 4. Values of f factor obtained by Poettmann are smaller than f data for our tests. The data from Fig. 4 suggest that f value bas a probability of becoming smaller as the lenght of pipe string increases.
Correlation of f factor for Reynolds' Number is shown in Fig. 5. Difference between f factor curve and curve of coefficient of friction for a pipe, in which single phase fluid flow, may be resulted from slippage in gas lift well.
Plot of f factor vs. gas-water ratio is shown in Fig. 6. Volues of f factor decreases rapidly with increasing gas-water ratio and approach to the constant values corresponding to the length of producing pipe strings.
Data for the gas lift method, in which gas liquid mixtures flow out through the annular space between casing and tubing, are also plotted on the f factor curve shown in Fig. 4 (see Fig. 10). Though the effect of velocity head on f factor was calculated, the effect of the former on the latter might be neglected.

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The stabilities of oil emulsion muds which are made of thirteen different emulsifying agents are measured by the use of centrifuge. Noigen EA-141 (nonion type) is proved to be a excellent emulsifying agent for oil emulsion muds.

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