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 53, Issue 4
Displaying 1-5 of 5 articles from this issue
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  • Paleogeothermal Gradient Estimation by Spin-lattice Relaxation Time (T1) of Kerogen
    Yoshihiro UJIIE, Masahiko AKIYAMA
    1988 Volume 53 Issue 4 Pages 251-255
    Published: 1988
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.53.251
    JOURNAL FREE ACCESS
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    1H spin-lattice relaxation time (T1) of kerogen as measured by NMR gives a regular increase with increasing burial depth. Organic maturation proceeds with a doubling of reaction rate for each 10°C increase in temperature. Relations between T1 and paleotemperature on the kerogen samples separated from argillaceous rocks of the MITI-Hamayuchi borehole were figured in due consideration of time. Paleogeothermal gradients on five boreholes and two outcropping section samples were estimated on the basis of the comparison with the standard figure of MITI-Hamayuchi. The gradient data obtained in this method show a slightly lower value than those calculated without any consideration of the absolute geologic age of kerogens. This evidence can be explained by slower sedimentation rate of all the sampling localities than in the MITI-Hamayuchi.
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  • Natural Gas Deposits of Dissolved-in-water Type and Sand/Silt System
    Yoshiyuki TAZAKI
    1988 Volume 53 Issue 4 Pages 256-264
    Published: 1988
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.53.256
    JOURNAL FREE ACCESS
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    The Kazusa formations in Minami Kanto gas field consist of sandstones and siltstones alternately. The fluids flow mechanism in this reservoir is similar to that in naturally fractured reservoirs.
    A three-dimensional, two-phases double porosity model is applied for predicting the behavior of fluids in the sand/silt system. Using this model, we make simulation studies and verify theoretically the mechanism of fluids flow in the Mobara type gas field.
    As a result of simulation studies, original gas in siltstones is larger than that in sandstones and gas saturation in siltsones sways production performance together with permeability of siltstones.
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  • [title in Japanese]
    [in Japanese]
    1988 Volume 53 Issue 4 Pages 265-269
    Published: 1988
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.53.265
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1988 Volume 53 Issue 4 Pages 270-273
    Published: 1988
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.53.270
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1988 Volume 53 Issue 4 Pages 274-282
    Published: 1988
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.53.274
    JOURNAL FREE ACCESS
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