Journal of the Japanese Association for Petroleum Technology
Online ISSN : 1881-4131
Print ISSN : 0370-9868
ISSN-L : 0370-9868
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Volume 25, Issue 7
Displaying 1-6 of 6 articles from this issue
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  • Minor and Trace Elements and Refractive Indices of Volcanic Glasses of Tuffs
    A Preliminary Study for the Purpose of Correlation
    Kozo KAWAI, Hiroshi YAMADA
    1960 Volume 25 Issue 7 Pages 290-297
    Published: November 30, 1960
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.25.290
    JOURNAL FREE ACCESS
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    From the point of view of the stratigraphy of the oil or gas fields in Japan, it is very important to establish the methods of identifying or distinguishing vitric tuff beds which are intercalated in the Neogene formations and serve as horizon-markers. For the above purpose, we carried out spectrochemical analysis of many tuff samples from the Maego district, Akita Prefecture, and also measured refractive indices of volcanis glasses in them. Through this preliminary study we have come to the following conclusions: (1) Such elements as V, Zr, Pb, Co, Ni, and B, and refractive indices of volcanic glasses clearly characterize some tuff beds of similar lithology. (2) Because of the irregularity of the distribution of the elements in any tuff bed, which is partly due to impurities and alteration, sampling tuffs and treating the samples must be carefully conducted.
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  • A Study of Sedimentary Rorka
    Chpmiral conmosition and environment of sedimentation
    Koji MOTOJIMA, Atsushi ANDO, Masaki KAWANO
    1960 Volume 25 Issue 7 Pages 298-303
    Published: November 30, 1960
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.25.298
    JOURNAL FREE ACCESS
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    Not many studies on the sedimentary rocks of Japan have been published so far. The writers have carried out geochemical studies on the specimens of sedimentary rocks belonging to the Urahoro group (Paleogene), which were collected in the Shoro District, Kushiro coal field. Nine specimens are analysed chemically and minor elements are also analysed spectrochemically of 21 specimens. The environment of sedimentation of this group is discussed on the basis of these results. It is considered that the sedimentary rocks belonging to this group deposited in the place where there is stronger effect of sea water than that presumed by paleontological methods.
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  • Reserch on Permeability of Fracturing Sand
    Hiroshi SHIBAMIYA
    1960 Volume 25 Issue 7 Pages 304-308
    Published: November 30, 1960
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.25.304
    JOURNAL FREE ACCESS
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    The permeabiligy of fracturing sand has an effect on fracturing result straightly, as the productivity increase by fracturing is due to the highly permeable sand bed, which is newly formed by packing fractures with sand, and more oil moves along easier into the well bore. In this paper the discussion is made on factors controlling the permeability of fracturing sand, and on the method of obtaining the fracturing sand permeabiligy. The comparatively good coincidense is obtained between experimental values and calculated values of fracturing sand. However, suitable value of sphericity factor must be counted.
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  • Study on the Lost Circulation in Yabase Oil Field
    Sen-ichi MATSUMOTO, Masomi IGARASHI
    1960 Volume 25 Issue 7 Pages 309-318
    Published: November 30, 1960
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.25.309
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    The lost circulation in Yabase oil field is discussed, and method for preventing the lost circulation is described in this paper.
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  • Invasion of Mud Fluid into Gas-dissolved Water Zone
    Kiyomitsu FUJII, Mitsuo SATO
    1960 Volume 25 Issue 7 Pages 319-322
    Published: November 30, 1960
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.25.319
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    Results of a study on the invasion of mud fluid into gas-dissolved water zone tested by the use of artificial consolidated sands are described in this paper. Some of the results obtained are as follows: (1) when water pressure is low, a mud cake interrupts flow of water, (2) more mud fluid invades into a sand of higher permeability, (3) therefore, the degree of reduction of water permeability is conspicuous in a sand of higher permeability, and (4) when water pressure is high, invasion of mud fluid affects little upon the water permeability.
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  • [title in Japanese]
    [in Japanese]
    1960 Volume 25 Issue 7 Pages 323-327
    Published: November 30, 1960
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.25.323
    JOURNAL FREE ACCESS
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