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Detection of Inflow Permeable Zones Using Fluid Replacement Conductivity Logging in Coastal Aquifer  

Hwang, Se-Ho (Geological and Environmental Hazards Division, Korea Institute of Geoscience and Mineral Resources)
Park, Yun-Seong (Geological and Environmental Hazards Division, Korea Institute of Geoscience and Mineral Resources)
Shin, Je-Hyun (Geological and Environmental Hazards Division, Korea Institute of Geoscience and Mineral Resources)
Park, Kwon-Gyu (Geological and Environmental Hazards Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Geophysics and Geophysical Exploration / v.9, no.3, 2006 , pp. 225-230 More about this Journal
Abstract
Fluid replacement and conductivity logging have been applied to three boreholes in coastal aquifer in order to identify permeable fractures and to estimate the origin of saline groundwater. Fluid replacement technique measures and monitors the change of borehole fluid conductivity with depth under ambient or pumping condition after replacing the original borehole fluid with different one (by pumping out original one and injecting simultaneously new one at the hole bottom). After the replacement of borehole fluid, the change of fluid conductivity can be the direct indicator of the intake flow of formation water through aquifer such as permeable fractures or porous formations. The conductivity profiles measured with times therefore indicate the locations of permeable zone or fractures within the open hole or the fully slotted casing hole. As a result of fluid conductivity logging for three boreholes at coastal area in Yeonggwang, Jeonam Province, it is interpreted that the seawater intrusion in this area is not by remnant saline groundwater after land reclamation but mainly by intrusion of saline water through fractured rock. This approach might be useful for assessing the characteristics of seawater intrusion, the design of optimal pumping, the mitigation of seawater intrusion using freshwater injection, and estimating the hydraulic characteristics in coastal aquifer.
Keywords
fluid replacement technique; seawater intrusion; fluid conductivity logging; detection of permeable fracture;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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