物探与化探2015，Vol.39Issue(6)：1150-1155,6.DOI:10.11720/wtyht.2015.6.09
均匀大地CSAMT静态效应模拟及其特征研究
Simulation of CSAMT static effect and research on its characteristics in homogeneous earth
摘要
Abstract
Uneven electric body near the ground surface interferes the target field, which is called static effect that is regarded as one of the noises of deep exploration. In order to deeply understand the static effect, the authors simulated respectively the ground surface re-sponses of axial and asides observation methods on the conditions of taking homogeneous earth as model background and Cagniard ap-parent resistivity as explanation parameter. Some conclusions have been reached:( 1) The effects of static characteristics of the two ob-servation methods are consistent. ( 2) The interference is maximum for measuring points above the anomaly body. On the contrary, the interference is minimum for the points which stay away from the anomaly body. ( 3) Low resistivity abnormal body causes the contours of the interference area to become concave. The resistivity is lower. High resistivity abnormal body causes the contours of the interfer-ence area to become convex. However, changes of contours into convexity are not obvious although the resistivity of anomaly body is en-larged. Both low resistivity abnormal body and high one cause the mid-low frequency contours to become nearly erect in the interference area;( 4) The static effect of low resistivity causes the standard curve to be parallel downward in mid-low frequency, but in high fre-quency the extent of the standard curve paralleling downward depends on low resistivity value, the lower the resistivity is, the less par-allel the standard curve downward is, because of stronger electromagnetic induction for lower abnormal body which is superimposed up-on the static effect. However, the static effect of high resistivity causes the standard curve parallel upward in full frequency, which is consistent with previous conclusions. The results can provide a reference for the identification and improvement of static effect correction algorithm and hence has a certain theoretical and practical value.关键词
CSAMT/静态效应/三维异常体/数值模拟/卡尼亚视电阻率Key words
CSAMT/static effect/three-dimensional abnormal body/numerical simulation/Cagniard apparent resistivity分类
天文与地球科学引用本文复制引用
胡瑞华,林君,孙彩堂,刘长胜,周逢道..均匀大地CSAMT静态效应模拟及其特征研究[J].物探与化探,2015,39(6):1150-1155,6.基金项目
教育部和财政部联合项目(OSR-02-01) （OSR-02-01）
吉林大学青年基金项目(4305050102RV) （4305050102RV）
