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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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To delineate geothermal water movement at the Pohang geothermal development site, Self-Potential (SP) surveyand monitoring were carried out during pumping tests. Before drilling, background SP data have been gathered to figureout overall potential distribution of the site. The pumping test was performed in two separate periods: 24 hours inDecember 2003 and 72 hours in March 2004. SP monitoring started several days before the pumping tests with a 128-channel automatic recording system. The background SP survey showed a clear positive anomaly at the northern partof the boreholes, which may be interpreted as an up-flow zone of the deep geothermal water due to electrokinetic potentialgenerated by hydrothermal circulation. The first and second SP monitoring during the pumping tests performed to figureout the fluid flow in the geothermal reservoir but it was not easy to see clear variations of SP due to pumping andpumping stop. Since the area is covered by some 360 m-thick tertiary sediments with very low electrical resistivity (lessthan 10 ohm-m), the electrokinetic potential due to deep groundwater flow resulted in being seriously attenuated on thee variation of SP with that of groundwater level and temperature of pumpingwater, we could identify some areas responsible to the pumping. Dominant SP changes are observed in the south-westpart of the boreholes during both the preliminary and long-term pumping periods, where 3-D magnetotelluric surveyshowed low-resistivity anomaly at the depth of 600 m~1,000 m. Overall analysis suggests that there exist hydraulicconnection through the southwestern part to the pumping well.
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