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

断層及び背斜軸周辺の移行経路を把握するための高精度微量ガス濃度測定; 北海道、幌延地域における例

下茂 道人*; 丹羽 正和   ; 宮川 和也   ; 安江 健一*; 徳永 朋祥*; 戸野倉 賢一*; Biraud, S.*

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

本研究では、幌延地域の断層や褶曲を事例対象として、可搬型高精度ガス測定によって断層や褶曲における地下からのガス移行経路を把握するための調査技術の検証を行い、その有効性を示すことができた。

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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