Journal of Groundwater Hydrology
Online ISSN : 2185-5943
Print ISSN : 0913-4182
ISSN-L : 0913-4182
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Volume 56, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • Geochemical characteristics of formation waters from oil and gas fields in Akita Prefecture, Japan
    Susumu KATO
    2014 Volume 56 Issue 4 Pages 299-307
    Published: November 30, 2014
    Released on J-STAGE: January 09, 2015
    DOIhttps://doi.org/10.5917/jagh.56.299
    JOURNAL FREE ACCESS
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    Formation waters from oil and gas fields in Akita Prefecture, Japan, have the following geochemical characteristics.
    1) Very low SO42－ and Mg2＋ contents, and high HCO3－, I－, and NH4＋ contents compared withseawater.
    2) A relatively narrow range of δD values between －17 and －4 ‰ and large variations of δ18Ovalues from －3.5 to ＋3.7‰, similar to formation waters from oil and gas fields in Niigata, Japan.
    These chemical and isotopic data indicate that the formation waters were originated from seawater that was trapped in sediment pore spaces during deposition and was subsequently altered during the interaction with reservoir rocks, during the maturation of organic matters, and during diagenesis.
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  • Genetical relationship of ground water and river water to precipitation suggested from several observation results of their hydrogen and oxygen isotopic ratios at Akita
    Osamu MATSUBAYA, Hiroshi KAWARAYA
    2014 Volume 56 Issue 4 Pages 309-320
    Published: November 30, 2014
    Released on J-STAGE: January 09, 2015
    DOIhttps://doi.org/10.5917/jagh.56.309
    JOURNAL FREE ACCESS
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    Hydrogen and oxygen isotopic ratios of ground water and river water are compared with those of precipitation at Akita, and genetical relationship is discussed among these three waters. The isotopic ratios of ground water and river water are fairly constant through a year, and similar to those of annual mean precipitation. This suggests that a part of precipitation flowing out to river is not subjected to modification of isotopic ratios by evaporation, evapo-transpiration, direct runoff and others which happen near ground surface. If this is the case, some possible processes are required, for example, the part flowing out to river penetrates separately from the part subjected to the above isotopic modification, or precipitation penetrating mixes well and such homogenized water is returned to atmosphere.Or, it may be necessary to consider any other possible processes.
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