摘要
在二维地电模型中,大地电磁测深倾子资料可以很好地反映地电构造的水平非均匀性,特别是在解释垂直或者倾斜板状体的空间分布情况时,可以起到十分重要的作用,在实际应用中可以用来寻找断裂,判断其走向、倾向、埋深和规模。应用有限单元法分别对水平、垂直和倾斜的板状模型进行正演模拟,该算法采用矩形网格内进一步三角形细化的方式剖分模型,通过三角形网格提高了对倾斜接触面的近似程度,同时增加计算量不明显,然后计算出倾子的实部、虚部和振幅的资料。研究结果表明:倾子响应对介质电性水平不均匀反映十分灵敏,特别是对横向低阻异常体,同时对异常体的位置和埋深也有清楚的显示。
In the two-dimensional geo-electric model,the magnetotelluric(MT) tipper data can reflects the horizontal non-uniformity of geo-electric structure clearly.It plays an important role in data interpretation,especially in vertical or tilted tabular body identification.MT tipper data can be used to find fault and determine the location、inclination、size and depth of models.This paper emphasizes a forward simulation for a model with two tabular body through the finite element method.We can calculate tipper's real part,imaginary part,amplitude and phase information by using triangle grids,which can be a great way to improve the accuracy of our forward simulation's results but not gaining the strength of calculation much,to refine traditional rectangular grids.The results show that:the response of tipper obviously reflects that the horizontal non-uniformity of electric resistivity of medium especially in transverse low resistance anomalies,and the location and depth of anomalies are also shown clearly.
出处
《物探化探计算技术》
CAS
CSCD
2012年第5期541-547,500-501,共7页
Computing Techniques For Geophysical and Geochemical Exploration
基金
国家科技支撑计划项目(2011BAB04B08)
中国地质调查局科研项目(资[2011]03-01-64)
有色资源与地质灾害探查湖南省重点实验室项目(2010TP4012-6)
中南大学前沿研究计划项目(201023100002)
湖南省科研条件创新专项项目(2010TT2056)
关键词
大地电磁测深
倾子
板状体
有限单元法
magnetotelluric(MT)
tipper
tabular body
finite element method
