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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

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

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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