복합 지구물리탐사 자료를 이용한 해안 대수층의 3차원 지질구조 영상화 및 등가 NaCl 염분도 분포도 작성

Abstract

We have imaged the 3-D geometry of coastal aquifer and mapped the salinity in the aquifer using DC resistivity data and seismic refraction data. The 3-D geometry of upper and lower boundary of coastal aquifer has been imaged using spatial kriging of aquifer interfaces interpreted from DC resistivity data at 6 survey lines. To define aquifer interfaces from resistivity data we used relationship between seismic velocity and resistivity derived by correlational analysis of velocity and resistivity data at adjacent survey line. The salinity within the aquifer has been mapped in terms of NaCl equivalent salinity using the empirical relationship between fluid conductivity and NaCl equivalent salinity of the site. The fluid conductivity data for salinity mapping is estimated by the Archie's law using bulk resistivities from DC resistivity data and porosity estimated by well-logging.