Modulus Inversion of Three-Component Borehole Magnetic Data
详细信息
- 责任者：Ou Yang (Institute of Geophysical and Geochemical Exploration ; CAGS ; Langfang 065000 ; China) ; Liu Tianyou
- 刊名：Geophysical and Geochemical Exploration
- 出版年：2013
- 卷期：37(4)
- 关键词：磁测井 ; magnetic logging ; 反演问题 ; inverse problem
- 页码：p.664-669
- 图表：illus., 2 tables, 19 refs.
- 分类号：1600
- issnNo：ISSN1000-8918
- isbnNo：CN11-1906/P
摘要
It is usually necessary to consider the magnetization direction of the magnetic body in the interpretation of three-component borehole magnetic data;however,it is rather difficult to determine the magnetization direction under the strong effect of remnant magnetization or demagnetization.The modulus of magnetic anomaly is not dependent or insignificantly dependent on the magnetization direction,and modulus can be calculated directly by using three-component borehole magnetic data.The authors hence tried to inverse the model parameters with the modulus of three-component borehole magnetic data.First,the value of the modulus was calculated by using three-component borehole magnetic data.Then,the geometrical and magnetic parameters of 2D tabular body and vertical cube were inversed with the modulus data.Finally,this method was applied to the borehole magnetic data of an iron ore mine in Xinjiang.The results show that the modulus inversion result is less influenced by magnetization direction when magnetization direction is unknown or inaccurate;the modulus inversion is superior to the traditional inversion using single-component Za and receives good geological results.