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.*

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.