Journal of the Japanese Association for Petroleum Technology
Online ISSN : 1881-4131
Print ISSN : 0370-9868
ISSN-L : 0370-9868
Search
Advanced search
OR
Browse
Search
Volume 54, Issue 4
Displaying 1-4 of 4 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Chemical Composition of Natural Gases from Oil and Gas Fields in the Niigata Basin
    Susumu KATO
    1989 Volume 54 Issue 4 Pages 259-268
    Published: 1989
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.54.259
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The natural gases collected during production testing from nine oil and gas fields in the Niigata basin were characterized using parameters such as C2+, C2/C3, iC4/nC4, iC5/nC5, N2 and CO2. The chemical compositions of gases are related to the temperatures of the reservoirs from which the gases are produced.
    Chemical composition together with isotopic composition of methane suggests that the natural gases in the area are of thermogenic and mixed thermogenic/bacterial origins. The iC4/nC4 ratio is considered to reflect both the type of source rock and its degree of thermal maturation.
    In the Hirakida gas field the gases from the Nishiyama and Shiiya Formations may have undergone bacterial alteration.
    View full abstract
    Download PDF (554K)
  • Stratigraphy and Chronology of the Mio-Pliocene Series in the Northern Part of the Higashikubiki District, Niigata Prefecture, Central Japan
    Osamu TAKANO, Toshio MURAMATSU, Iwao KOBAYASHI
    1989 Volume 54 Issue 4 Pages 269-280
    Published: 1989
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.54.269
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The stratigraphical study of the Mio-Pliocene sedimentary rocks distributed in the Higashikubiki district, Niigata Prefecture, is important to make clear the geohistory of the northern Fossa Magna.
    These rocks are divided into the Sugawa, the Tamugigawa, the Higashigawa Formations and the Uonuma Group in ascending order. The Sugawa Formation consists of massive siltstone. The Tamugigawa Formation is composed of sandstone, mudstone and flysh type alternation of sandstone and mudstone. The Tamugigawa Formation is further subdivided into four members, that is, the Lower, the Middle, the Upper and the Shobu mudstone Members. The Higashigawa Formation is composed of sandy siltstone. These formations conformably superpose each other.
    The distribution of tephra marker beds in the Tamugigawa Formation indicates that the flysh type alternating beds of the Lower, the Middle and the Upper Members change laterally into the mudstone of the Shobu Member.
    Nine tephrozones are discriminated on the basis of the lithology and frequency of marker tephra beds. All tephra beds range in composition from rhyolite to dacite, except for the tephrozone VII, which is composed of andesitic tephras and especially effective to the correlation of Mio-Pliocene strata in this area.
    From the result of the F. T. dating of tuff layers and biostratigraphical data, each formation is correlative with the strata in the district of the Nishiyama Hill as follows; the Sugawa Formation with the Shiiya Formation, the Tamugigawa Formation with the Hamatsuda Formation, the Higashigawa Formation with the Nishiyama Formation.
    View full abstract
    Download PDF (913K)
  • Some aspects on marine geology
    Noriyuki NASU
    1989 Volume 54 Issue 4 Pages 281-283
    Published: 1989
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.54.281
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The cause of sharp boundary between sand layer and mud layer amomg sand and mud alternation is explained from the hydrodynamical view point. In nature, gravel, sand, and mud are being separated by the difference of settling velosity and threshold velosity. This process causes the sharp boundary between sand and mud layers among sediment. Furthermore, ocean floor spreading theory, plate tectonics theory, accretionary wedge, the discovery of Oyashio ancient landmass beneath the deep sea terrace of japan Thrench and their significance are introduced.
    View full abstract
    Download PDF (188K)
  • [title in Japanese]
    [in Japanese]
    1989 Volume 54 Issue 4 Pages 284-290
    Published: 1989
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.54.284
    JOURNAL FREE ACCESS
    Download PDF (465K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top