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Ioka, Seiichiro; Iwatsuki, Teruki; Amano, Yuki; Furue, Ryoji*
Nihon Suimon Kagakkai-Shi, 37(1), p.3 - 8, 2007/02
For safety assessment of geological isolation, it is important to evaluate in situ redox buffer capacity in high-permeability zone as groundwater flow path. This study evaluated in situ sulfate reduction rate as redox buffer capacity in the conglomerate bedding in Toki Lignite-bearing Formation, which occurs at the lowest part of sedimentary rocks overlying basement granite. The bedding plays an important role as the main groundwater flow path. The result showed that in situ redox buffer capacity in the conglomerate bedding has been identified on first nine months, whereas in the following period the redox buffer capacity has not been identified for about fifteen months. This will be caused by the bedding became inappropriate for microbial survival as the organic matter which is needful for microbial activity was consumed. Thus, there will be limited redox buffer capacity in groundwater flow path even in formation including organic matter-bearing layer.
Ioka, Seiichiro; Furue, Ryoji*; Iwatsuki, Teruki
Nihon Suimon Kagakkai-Shi, 36(4), p.181 - 190, 2006/11
Hydrogeological and geochemical investigations are required when the deep underground environment is explored or when the water from these depths are to be used as a resource. This study demonstrates the methodology on geochemical sampling of groundwater to evaluate the redox condition in a deep borehole with large downward hydraulic gradient. In the case of losses of drilling fluids during drilling, groundwater was sampled using single and double packer equipment at the time of the fluid loss. When there was no loss of drilling fluids groundwater samples where successfully obtained using a long term multi-packer system.
Iwatsuki, Teruki; Furue, Ryoji; Mie, Hideki; Ioka, Seiichiro; Mizuno, Takashi
Applied Geochemistry, 20(12), p.2283 - 2302, 2005/12
Times Cited Count：58 Percentile：71.91(Geochemistry & Geophysics)Hydrochemical conditions up to 1000m below ground level around the Mizunami Underground Research Laboratory were investigated to construct a baseline condition model descriving the undisturbed condition.
Furue, Ryoji; Iwatsuki, Teruki; Mizuno, Takashi
JNC TN7450 2004-002, 120 Pages, 2005/01
JNC-TN7450-2004-002.pdf:5.95MBJNC-TN7450-2004-002(errata).pdf:0.08MB
The purpose of this investigation is to determine the basal condition and the range of groundwater chemistry changing around the MIU construction site before excavation of shafts by using MP System installed at MSB-2 and MSB-4.Datasets for geochemical modelling and range of groundwater chemistry changing were obtained.
Mie, Hideki; Iwatsuki, Teruki; Furue, Ryoji; Mizuno, Takashi; Ioka, Seiichiro
JNC TN7400 2004-006, 64 Pages, 2004/10
JNC-TN7400-2004-006.pdf:9.26MBJNC-TN7400-2004-006(errata).pdf:0.08MB
This report describes the results of the investigation on the hydrochemical characteristic of groundwater in DH-15 borehole.
Furue, Ryoji; Iwatsuki, Teruki; Mizuno, Takashi; Mie, Hideki
JNC TN7520 2003-001, 74 Pages, 2003/11
JNC-TN7520-2003-001.pdf:1.71MB
TGC is carrying hydrochemical investigation in the Tono area. This book explains about outline of the method of obtaining hydrochemical data from borehole.
Furue, Ryoji; Iwatsuki, Teruki; Mizuno, Takashi; Hideki, Mie
JNC TN7450 2003-001, 103 Pages, 2003/08
JNC-TN7450-2003-001.pdf:4.63MB
This data book is the revised edition of the previous data book, made by Iwatsuki et al. (2001). Chemical data of groundwaters from 5 boreholes (MIU-4, DH-2, DH-3, MSB-2 and MSB-4) and those for onsen (spa) (Mikai and Hayakawa, 1970) are added to the previous edition. This data book presents the chemical data for groundwaters, surface waters and rain waters in the Tono area, obtained up to the beginning of April 2003. Compositions for about 350 waters are tabulated. These data were acquired over a period of more than 15 years, during many different studies that had various purposes. The data were obtained through the uranium exploration, the hydrochemical investigation within and around the Tono Mine, the regional hydrogeological study and the hydrochemical investigations within the Shobasama site and the MIU (Mizunami Underground Research Laboratory) construction site. While considerable effort has been expended to transcribe data correctly from the various sources, a care must be taken to read the data because of uneven quality in the data due to different methods of sampling and analyzing. Therefore report indicates the data sources, the geographical locations where the data were obtained and the main sampling and analytical methods respectively in order to reconfirm the suitability of the data for each appraisal purpose.
Kumazaki, Naoki; Koki, Ikeda; Goto, Junichi; Mukai, Kei; Iwatsuki, Teruki; Furue, Ryoji
JNC TN7400 2003-005, 112 Pages, 2003/08
JNC-TN7400-2003-005.pdf:9.72MB
The Shallow Borehole Investigations were one of the first programmes to be conducted at the MIU Construction Site, together with the reflection seismic survey and the re-investigation of borehole DH-2. The Shallow Borehole Investigation targeted the shallow part of the site, from the sedimentary cover rocks to the upper part of the granite. The main aims are understanding of initial groundwater flow and the groundwater chemistry, long term monitoring and to identify structural discontinuities in the sedimentary rocks and the weathered granite. From April to October 2002 four boreholes were drilled through the sedimentary sequence and the weathered granite section at the MIU Construction Site. Planned geological, hydrogeological and hydrochemical investigations were carried out. MP systems were installed in all boreholes by December 2002 and continuous monitoring of hydraulic head begun. Information on geology, hydrogeology and hydrochemistry of the sedimentary formation and the weathered granite was acquired. JNC's quality control procedures for borehole investigation programmes were employed. In addition, recommendations for future borehole investigation programmes, especially in sedimentary rocks, were given.
