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Journal Articles

On the atmospheric methane anomalies around the anticlinal axis

Shimo, Michito*; Niwa, Masakazu; Miyakawa, Kazuya; Yasue, Kenichi*; Tonokura, Kenichi*; Tokunaga, Tomochika*

Fukada Chishitsu Kenkyujo Nempo, (23), p.21 - 34, 2022/00

no abstracts in English

Journal Articles

A Proposed method to discriminate a gas derived from deep underground by focusing on the relationship between changes in methane and carbon dioxide concentrations in the atmosphere

Miyakawa, Kazuya; Shimo, Michito*; Niwa, Masakazu; Amano, Kenji; Tokunaga, Tomochika*; Tonokura, Kenichi*

Fukada Chishitsu Kenkyujo Nempo, (22), p.139 - 153, 2021/00

no abstracts in English

Journal Articles

Estimation of gas migration pathways around faults based on the distribution of atmospheric methane near ground surface

Shimo, Michito*; Niwa, Masakazu; Miyakawa, Kazuya; Amano, Kenji; Tonokura, Kenichi*; Tokunaga, Tomochika*

Fukada Chishitsu Kenkyujo Nempo, (22), p.119 - 137, 2021/00

no abstracts in English

Journal Articles

The Groundwater pressure response due to shaft excavation and its possible application for characterizing hydrogeological structure

Toya, Naruhisa; Takeuchi, Ryuji; Tokunaga, Tomochika*; Aichi, Masaatsu*

Proceedings of 36th International Association of Hydrogeologists Congress 2008 (IAH 2008) (CD-ROM), 7 Pages, 2008/10

Excavation of the Mizunami Underground Research Laboratory began in 2003. In 2006-2007, several boreholes were drilled from the shafts and the gallery at GL-200m. Several monitoring boreholes are located in the vicinity of the NNW striking fault. The data from groundwater pressure monitoring obtained at multiple depth intervals during the drilling activities show unique responses, which resemble deformation-induced effects. In this study, we report the possible application of using these hydraulic responses for characterizing the hydrogeological structures of the site.

JAEA Reports

Research on the Hydrogeological and Geochemical Conditions at the Coastal Area and Submarine Formations

Tokunaga, Tomochika*; Taniguchi, Makoto*; Shimada, Jun*; Zhang, J.*; Inaba, Kaoru; Saegusa, Hiromitsu; Iwatsuki, Teruki

JNC TY7400 2003-003, 142 Pages, 2003/05

JNC-TY7400-2003-003.pdf:6.85MB

One of the major concerns for the high-level radioactive waste disposal is the possibility of the radionuclides to reach biosphere by groundwater flow. Recent research results have shown that the fresh groundwater discharge from subsea formations are widespread phenomena, thus, it is necessary to evaluate the submarine groundwater discharge as possible pathways of contaminant discharge towards the biosphere. It is also important to unravel the groundwater flow and associated material transport at the coastal area and subsea formations. To better understand the groundwater flow processes and the submarine groundwater discharge, we have conducted the hydrological, hydrogeological, geochemical, and numerical modeling studies at the Kurobe alluvial fan and its offshore, Toyama Prefecture, Japan. In this report, the results of the following research activities are presented:1)Development and application of a method to detect the locations of the submarine groundwater discharge.2)Development and application of a method to collect uncontaminated groundwater samples from subesa formations.3)Measurements of submarine groundwater dischange fluxes by automated seepage meter.4)Hydrological and geochemical studies for groundwater flow at the coastal area.5)Geochemical studied to understand sources of fresh submarine groundwater discharge.6)Extamination of groundwater flow and submarine groundwater discharge using methane concentration and carbon isotope ratio.7)Numerical modeling studies for coastal groundwater flow system.

Journal Articles

None

Saegusa, Hiromitsu; Tokunaga, Tomochika*; *

Gekkan Chikyu, 23(12), p.857 - 862, 2001/00

None

Oral presentation

Analysis of stable chlorine isotopic ratios and saline water diffusion model in sedimentary formation

Tokunaga, Tomochika*; Kimura, Yuki*; Ijiri, Yuji*; Motoshima, Takayuki*; Kunimaru, Takanori; Takamoto, Naohiko*; Shimada, Jun*; Hosono, Kenichi*

no journal, , 

no abstracts in English

Oral presentation

Identification of active fault location using real-time ground measurements of atmospheric methane concentration by portable Cavity Ring-Down Spectroscopy system; Case study at the Atera fault

Shimo, Michito*; Niwa, Masakazu; Amano, Kenji; Tokunaga, Tomochika*; Tonokura, Kenichi*; Matsuoka, Toshifumi*; Biraud, S.*

no journal, , 

Faults and associated fracture zones often provide the paths for migration of the gas, such as methane, hydrogen and helium, formed in the deep subsurface formations. In this study, we conducted the field measurement of methane gas concentration using a back-pack type portable Cavity Ring-Down Spectroscopy (CRDS) gas analyzer at the Atera fault area in Gifu prefecture. The measurement result suggests that the trace gas measurement using a CRDS technology can be one of the promising approaches to delineate the locations of the active faults creating migration paths of the deep-seated fluids.

Oral presentation

Active fault investigation by trace methane gas measurement in the atmosphere using cavity ring-down spectroscopy; An Example at the Atera Fault, Gifu prefecture, Japan

Shimo, Michito*; Niwa, Masakazu; Amano, Kenji; Tokunaga, Tomochika*; Tonokura, Kenichi*; Matsuoka, Toshifumi*; Biraud, S.*

no journal, , 

To investigate the possibility of cavity ring-down spectroscopy technology to the gas release detection from the active fault to the atmosphere, we conducted field measurements at the Atera fault area in Gifu prefecture, Japan. Based on the results, we expect that the real-time high precision gas measurement can be one of the promising approaches to locate the active faults creating paths for the deepseated fluids.

Oral presentation

Identification of gas migration pathways around faults and fold axes using high-precision methane measurement technology

Shimo, Michito*; Niwa, Masakazu; Miyakawa, Kazuya; Tonokura, Kenichi*; Tokunaga, Tomochika*

no journal, , 

To develop a new approach to identify the fluid flow paths in the rock formation using high-precision gas concentration detection technology, we carried out the on-ground methane concentration measurement in the Horonobe area, northern Hokkaido. A set of NW-SE trending folds and faults occur through the area. Based on the findings of oil and gas seepage, the petroleum exploration survey was conducted in this area. These records suggest the existence of the fluid migration pathways around faults to reach the ground surface from an underground source. In this paper, we report the results of on-foot measurement of methane and carbon dioxide concentrations using CRDS apparatus and depict the possible migration paths around faults based on the distribution of gas seeps and geological and geophysical information reported in the existing literature.

Oral presentation

CRDS application for oil and gas exploration as reconnaissance tool

Shimo, Michito*; Yokoi, Satoru*; Miyakawa, Kazuya; Niwa, Masakazu; Matsuoka, Toshifumi*; Tokunaga, Tomochika*

no journal, , 

In this presentation, we report several preliminary studies to detect methane seepage using a portable gas analyzer by cavity ringdown spectroscopy.

Oral presentation

CRDS application for petroleum exploration, 2; A Case study of gas seeps associated with a faulted anticline in Hokkaido, Japan

Yokoi, Satoru*; Shimo, Michito*; Miyakawa, Kazuya; Niwa, Masakazu; Matsuoka, Toshifumi*; Tokunaga, Tomochika*

no journal, , 

In this presentation, we report methane gas seepages along an anticlinal axis in the Horonobe area, northern Hokkaido, and discuss migration paths from an underground reservoir.

Oral presentation

Precise trace gas measurements for identifying pathways around faults and anticlinal axis; A Field survey example at Horonobe, Hokkaido, Japan

Shimo, Michito*; Niwa, Masakazu; Miyakawa, Kazuya; Yasue, Kenichi*; Tokunaga, Tomochika*; Tonokura, Kenichi*; Biraud, S.*

no journal, , 

Faults and fractures often create migration pathways for gases formed in the subsurface. To investigate the applicability of the trace gas measurement to geologic seep detection, we conducted a series of mobile methane concentration surveys using Cavity Ring-down Spectroscop technology. The results support that precise trace gas measurement can be one of the promising approaches to characterize migration pathways and sources of methane in the subsurface.

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