Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Nonlinear Inversion of Time-domain Induced Polarization Data with Negative Apparent Chargeability Data

음의 겉보기 충전성 자료를 포함한 시간영역 유도분극 자료의 비선형 역산

  • Cho, In-Ky (Division of Geology and Geophysics, Kangwon National University) ;
  • Kim, Yeon-Jung (Department of Geophysics, Kangwon National University)
  • 조인기 (강원대학교 지질, 지구물리학부) ;
  • 김연정 (강원대학교 지구물리학과)
  • Received : 2021.09.27
  • Accepted : 2021.11.22
  • Published : 2021.11.30
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Abstract

Negative apparent chargeability data in time-domain induced polarization (IP) survey are very often considered as noise and rejected before the inversion stage. Negative IP data can, however, occur naturally as a consequence of the distribution of chargeable zones in the ground. In some cases, the negative apparent chargeability values may account for most of the data measured. Negative IP data are caused by the geometry of chargeable zones and electrode positions. Negative apparent chargeability data appear most frequently when a dipole-dipole array is used. In this study, the effect of negative apparent chargeability data on inversion results is analyzed through the numerical 2D time-domain IP modeling and nonlinear inversion. The results demonstrate clearly that negative apparent chargeability data have to be included in the inversion as they contain important information on the distribution of subsurface chargeability.

많은 경우 시간영역 유도분극 탐사에서 음의 겉보기 충전성은 잡음으로 간주되어 해석에 사용되지 않는다. 그러나 음의 겉보기 충전성은 실제 지하의 충전성 분포에 의해 발생할 수 있으며, 특정 모델의 경우 음의 겉보기 충전성이 획득된 자료의 대부분을 차지하기도 한다. 음의 겉보기 충전성은 송수신 전극과 충전성 이상대의 기하학적 위치에 의해 결정되며, 특히 쌍극자 배열을 사용할 경우 출현 빈도가 높다. 이 연구에서는 음의 겉보기 충전성 자료를 포함하는 시간영역 유도분극 탐사 2차원 모델링 및 비선형 역산에 관한 수치 실험을 통하여 음의 겉보기 충전성 자료가 역산결과에 미치는 영향을 분석하였다. 분석 결과, 음의 겉보기 충전성 자료도 지하의 충전성 분포에 대한 정보를 가지고 있으므로 역산에 포함되어야 하는 것으로 확인되었다.

Keywords

References

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