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 40, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • Compaction of Clays under High Pressure and Programming Temperature
    Koichi AOYAGI, Noboru KOBAYASHI, Toshie KAZAMA, Toshio SAWA, Saburo SA ...
    1975 Volume 40 Issue 3 Pages 111-116
    Published: 1975
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.40.111
    JOURNAL FREE ACCESS
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    Transformation of clay mineral facies in mudstones have been controlled mainly by overburden pressure and geothermal temperature. In primary migration of proto-petroleum from source rocks to reservoirs, expulsion of absorbed water in the swelling clay minerals by overburden pressure is considered to be very important. For the solution of these problems, study of compaction on various clays under high pressure and certain temperature is necessary.
    The writers, therefore, manufactured the triaxial, hydrostatic compaction apparatus which can increase the pressure to 1500kg/cm2 and the temperature to 150°C in maximum.
    Compaction on Na-montmorillontie and kaolinite clays have been conducted under the condition at 500kg/cm2 and room temperature. Water content in montmorillonite clay decreased gradually in straight, while those of kaolinite clay decreased rapidly by compaction. After 6 day's continuous experiments, there were no apprent changes in the mineralogical form of these clays.
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  • Relationships between Normal Alkanes and Maturation of Petroleum of Oilfields in Japan
    Tadashi ASAKAWA
    1975 Volume 40 Issue 3 Pages 117-126
    Published: 1975
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.40.117
    JOURNAL FREE ACCESS
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    Distribution of normal alkane hydrocarbons in sediments and crude oils of the oilfields in Japan were studied. Carbon preference indices of heavy normal alkanes (CPI) range from 1.41 to 3.00 for recent sediments, 1.01 to 6.41 for ancient sediments and 0.94 to 1.30 for crude oils.
    CPI is generally reduced with depth and inversely related to hydrocarbon/organic carbon ratio and heavier gaseous hydrocarbon/methane ratio in the mudstones from drilled wells. The relation between CPI and hydrocarbon/organic carbon ratio is not reciprocally proportional but rather hyperbotal. During early compaction stage which releases quantities of water the ratio is apparently invariable in accordance with the reduction of CPI, while it increases proportionally with CPI reduction during middle compaction stage of mild dewatering.
    At the transition point between early and middle compaction stages in MITI Hamayuchi, Hokkaido, distributions of normal alkane change to n-docosane or n-tricosane from n-heptacosane or n-nonacosane in their maximum frequencies. The depth and temperature of this transition point are about two kilometers and sixty centigrades respectively. This transitional point may suggests the initial stage of maturation of petroleum by thermal transformation from insoluble organic matters.
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  • A Study on the Relationship between Seismic Reflections and Logging Data, Velocity and Density
    Yoshinori ISHII, Yoshibumi KATO
    1975 Volume 40 Issue 3 Pages 127-139
    Published: 1975
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.40.127
    JOURNAL FREE ACCESS
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    It is well known that seismic reflection events are originated by a sequence of subsurface reflecting interfaces which is represented by a series of reflection coefficients. For the investigation of the reflection phenomenon, the so-called synthetic seismogram which is calculated from the reflection coefficients series, is used. Each reflection coefficent is connected to both velocity and density logging data. However the density data are not always available, then the synthetic seismograms have been quite often caluclated only by velocity data, approximately neglecting the density variations in comparison with the velocity changes without sufficient examinations. Accordingly the reflection coefficient computed with velocity data and with or without density data is investigated in detail. Furthermore the. resulting synthetic seismogram is also studied from this point of view. In addition to the aboves, the distributions of velocity vs. density are investigated with actual well logging data. Certain dependence of the variance of reflection coefficients upon the multiple events is studied using an artificial reflection coefficient series simulated by a sequence of random numbers.
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  • Some Problems in Oil and Substitute Fuel for Energy Cricis
    Kiyomitsu FUJII
    1975 Volume 40 Issue 3 Pages 140-144
    Published: 1975
    Released on J-STAGE: June 30, 2008
    DOIhttps://doi.org/10.3720/japt.40.140
    JOURNAL FREE ACCESS
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