The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
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Volume 127, Issue 4
Displaying 1-6 of 6 articles from this issue
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Special Issue Progress and prospect of sedimentology and sedimentary geology in Japan
Preface
Review
  • Progress in tsunami sedimentology
    Kazuhisa Goto, Daisuke Sugawara
    2021 Volume 127 Issue 4 Pages 199-214
    Published: April 15, 2021
    Released on J-STAGE: July 15, 2021
    DOIhttps://doi.org/10.5575/geosoc.2019.0003
    JOURNAL FREE ACCESS
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    During the past 25 years, sedimentary records have formed the basis for abundant research on the history and size of paleotsunamis. Recent events such as the 2004 Indian Ocean and 2011 Tohoku-oki tsunamis have provided valuable opportunities to study the sedimentary features and processes of modern tsunami deposits. Tsunami sedimentology is now a key part of tsunami risk assessment, and it is important to provide these scientific results to governors and to the public. The expeditious contributions of geologists to disaster mitigation efforts are of vital importance as large tsunamis may be generated along Japanese coasts over the next 25 years.

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  • Introduction and progress of facies analysis and sequence stratigraphy based on the studies of observation of siliciclastic strata in Japan
    Koichi Hoyanagi
    2021 Volume 127 Issue 4 Pages 215-224
    Published: April 15, 2021
    Released on J-STAGE: July 15, 2021
    DOIhttps://doi.org/10.5575/geosoc.2021.0001
    JOURNAL FREE ACCESS
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    Reconstruction of sedimentary environments based on sedimentary facies analysis has become more popular in Japan since the 1980s. Moreover, sedimentologists have demonstrated that sedimentary environments change over time, based on dynamic sequence stratigraphic concepts. Since 1991, increasing numbers of sedimentological papers have been published by Japanese authors. The 17th International Sedimentological Congress held at Fukuoka in 2006 was an opportunity to activate research exchanges among East Asian countries. Studies in sedimentary geology have progressed rapidly, thanks to state-of-the-art measurements, computer simulations, and careful observations of strata from field studies. Recent changes in the social and natural environments, however, have caused additional difficulties for research based on field studies.

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  • Recent development of sedimentological approaches in petroleum exploration and development technology
    Osamu Takano, Hiroyuki Arato
    2021 Volume 127 Issue 4 Pages 225-235
    Published: April 15, 2021
    Released on J-STAGE: July 15, 2021
    DOIhttps://doi.org/10.5575/geosoc.2019.0048
    JOURNAL FREE ACCESS
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    This paper reviews the progress on the sedimentological approaches in the petroleum exploration and production technology of Japan during the last 25 years (1990’s to 2010’s). The notable progress on the sedimentological methods in the Japanese petroleum industry may include a) the introduction and application of sequence stratigraphy to actual exploration and production projects, b) the development of three-dimensional (3D) seismic geomorphology, c) an improvement of reservoir depositional models, d) the development of 3D geology/reservoir modeling, e) the basin analysis technique as an element of petroleum system, f) the siliceous rock petrography for shale development, and g) the methane hydrate-related researches. The sequence stratigraphic application has been accepted as an integration method of variable-scale petroleum industry data sets. The 3D seismic geomorphological approach resulted from the integration of sequence stratigraphy and the 3D seismic technology development, and has provided valuable benefits in terms of the improvement of depositional models and reservoir distribution analysis. The recent development of 3D geology/reservoir modeling technique has been facilitated by the advancing geostatistics and 3D seismic geomorphological methods. The recent industrial trends focusing on the petroleum system and unconventional hydrocarbon development have promoted the basin analysis technique and shale/gas-hydrate researches.

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