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 38, Issue 6
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1973 Volume 38 Issue 6 Pages 325-326
    Published: 1973
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.38.325
    JOURNAL FREE ACCESS
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  • Drilling Characteristics of a Small Electrodrill
    Kiyomitsu FUJII, Shoichi TANAKA, Mitsuo SATO
    1973 Volume 38 Issue 6 Pages 327-334
    Published: 1973
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.38.327
    JOURNAL FREE ACCESS
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    Drilling experiments are made with a 3.7kW electrodrill, using corn, blade and diamond impregnated bits, respectively. Sandstone, tuff and andesite of which compressive strengthes are from 200 to 800kg/cm2 are drilled by these bits. Rotating speeds are between 690 and 740 rpm depending upon bit weight which is ranged from 40 to 300kg. In these experiments following conclusions are obtained:
    1) A cone bit is the most favorable for the electrodrill, because it gives a high drilling rate and a low torque.
    2) The electrodrill can not give a high bit weight, and this causes a low drilling efficiency. Notwithstanding a low efficiency of the electrodrill, it can drill comparatively fast, because its rotating speed is high.
    3) Three means are proposed to increase the drilling efficiency of the electrodrill: 1) to increase the output of a motor in order to give a higher bit weight, 2) to reduce the rotating speed to a reasonable level, and 3) to use a proper bit specially designed for the electrodrill.
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  • Cretaceous Carbonate Rocks of the Central Hokkaido, Japan, and Evaluation as a Reservoir
    Koichi AOYAGI, Toshie KAZAMA
    1973 Volume 38 Issue 6 Pages 335-342
    Published: 1973
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.38.335
    JOURNAL FREE ACCESS
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    The Cretaceous in the central Hokkaido are grouped into the upper, middle, and lower Ezo groups.
    These groups overlie the Jurassic Sorachi group and are covered by the Paleogene Ishikari group. The dominant carbonate rocks of these groups are limestones such as micrite, sparite and biolithite in the form of layers and nodules. Limy lithic wackes occur sometimes in the middle Ezo group. Carbonate facies are found remarkably in Tomitoi formation of the lower Ezo group, and Saku and Shubu (main part) formations of the middle Ezo group.
    Average effective porosity of the layered carbonate rocks in the studied area is approximately three per cent and is considerably lower than that of oil-bearing Neogene Tertiary in the northwestern Honshu. The average ratio of carbonate rocks in thickness to total outcrops is nearly five per cent and is almost equal to that of the northwestern Honshu. These data indicate that the Cretaceous carbonate rocks in the studied area have a lesser character as a petroleum reservoir.
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  • Preliminary Basin Analysis Based on Sedimentary Structures in the Niigata Neogene Basin, Central Japan
    Kenkoh MORITA, Tadami KATAHIRA, Akitoshi INOMA, Hirohiko YAMAMOTO, Kat ...
    1973 Volume 38 Issue 6 Pages 343-353
    Published: 1973
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.38.343
    JOURNAL FREE ACCESS
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    Sedimentary structure surveys have been conducted in the Niigata basin for the last 5 years as a method of petroleum exploration. Various sedimentary structures in Tertiary formations are observed in this basin. They indicate a significant change of paleocurrent systems between the Hamatsuda and the Nishiyama ages. From the beginning of the Nishiyama (early Pliocene), paleoccurrents began to be controlled by the structural trend which is well defined at present and called the Niigata trend. In other words, folding with the axes of the Niigata trend is considered to grow after the Hamatsuda age (earliest Pliocene).
    Looking at simple paleogeographic maps drawn based on paleocurrents, sandstones seem to have been deposited predominantly in the topographic lows in the basin, without any relation to distance from the source of supply. This fact seems to be incompatible with the classic geological theory that the coarser materials are deposited closest to the source of supply. This fact has to be taken into account for petroleum exploration.
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  • [title in Japanese]
    [in Japanese]
    1973 Volume 38 Issue 6 Pages 354-360
    Published: 1973
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.38.354
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1973 Volume 38 Issue 6 Pages 362-366
    Published: 1973
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.38.362
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1973 Volume 38 Issue 6 Pages 367-378
    Published: 1973
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.38.367
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1973 Volume 38 Issue 6 Pages 379-389
    Published: 1973
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.38.379
    JOURNAL FREE ACCESS
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