Evaluating groundwater flow using borehole temperature logs: Estimation of vertical groundwater flow velocity and effects of drilling disturbances

Temperature-depth profiles acquired by borehole temperature logging at the casing section were used to evaluate the vertical groundwater flow. Residual effects of borehole drilling construction were confirmed by the observations measured on the day after the construction by comparing the temperature...

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Bibliographic Details
Published inJournal of Japanese Association of Hydrological Sciences Vol. 51; no. 3; pp. 51 - 63
Main Authors MIYAKOSHI, Akinobu, MORIKAWA, Noritoshi, TSUKAMOTO, Hitoshi, ITO, Kazumasa
Format Journal Article
LanguageEnglish
Japanese
Published Tokyo THE JAPANESE ASSOCIATION OF HYDOROLOGICAL SCIENCES 25.12.2021
Japan Science and Technology Agency
Subjects
Aquifers
Boreholes
Classification
Construction
Data logging
Depth
Disturbances
Drilling
drilling disturbance
Evaluation
Flow system
Flow velocity
Groundwater
Groundwater data
groundwater discharge
Groundwater flow
Hydrologic data
Logging
Residual effects
subsurface temperature monitoring
Temperature
Temperature effects
Temperature gradients
temperature-depth profile
type curve match
Water flow
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Summary:Temperature-depth profiles acquired by borehole temperature logging at the casing section were used to evaluate the vertical groundwater flow. Residual effects of borehole drilling construction were confirmed by the observations measured on the day after the construction by comparing the temperature-depth profile data, which were measured four times intermittently during the temporary suspension period of the construction. Consequently, the construction effects were sufficiently reduced after 12 days or more elapsed after the construction was suspended. The depth classification based on the characteristics of changes in the thermal gradient of the data was consistent with the geological classification. Moreover, effects of groundwater flow differed depending on the depth. Based on the type curve match results, the effects of upward groundwater flow were detected in the aquifer between 40 and 128 m of depth. Furthermore, the analysis of the borehole temperature log data indicated that the drilling site was located in the discharge area of the groundwater flow system. Therefore, reducing the effects of drilling disturbances is necessary for the application of borehole temperature logging data in groundwater flow analysis.
ISSN:1342-9612
1883-7166
DOI:10.4145/jahs.51.51