基于时域激电数据的2.5D频谱参数反演  

Inversion of 2.5D Spectrum parameters on the basis of time-domain IP data

作　　者：钟伟 罗润林[1] 刘亚雯 李亚南[1] 徐志锋[1] 唐国智 彭诚 ZHONG Wei;LUO Runlin;LIU Yawen;LI Ya'nan;XU Zhifeng;TANG Guozhi;PENG Cheng(College of Geoscience,Guilin University of Techonolgy,Guilin 541006,Guanxi,China;Geological Survey Institute of Henan Province Nuclear Geology,Zhengzhou 450004,Henan,China)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541006 [2]河南省核工业地质调查院,河南郑州450004

出　　处：《矿产与地质》2019年第6期1068-1073,共6页Mineral Resources and Geology

基　　金：国家自然科学基金项目(编号:41564002);广西自然科学基金项目(编号:2018GXNSFAA050019)共同资助。

摘　　要：Cole-Cole模型频谱参数能够定量评价异常体电性特征和寻找深部矿(化)体。但目前时间域激电法只利用了视电阻率和某一时窗的视充电率进行解释,其他数据则被忽略,使得激电异常往往难以准确解释,已经严重影响和制约了该方法的应用和发展。为此,提出一种基于时间域激电数据的2D频谱参数反演方法,首先由各时窗的2.5D视充电率转换为视等效电阻率,然后采用最小二乘法反演得到各时窗的等效电阻率,并转换成充电率,最后由各时窗充电率计算得到频谱参数。算例表明,该方法可以有效地从2.5D时域激电数据中提取出频谱参数信息,实现频谱参数成像。The spectrum parameters of Cole-Cole earth model can quantitatively evaluate the electrical characteristics of geophysical anomalies and explore for the deep mineralization body.But at present the apparent resistivity and the apparent charging rate of one time-window are just used to interpret the time-domain induced polarization(TD IP)data,and the others data,such as other time-window charge rate,are ignored,which makes it difficult to explain the IP anomalies accurately.It is seriously affected and restricted for the application and development of the method.Therefore,this paper has presented a 2.5D inversion method of spectrum parameters on the basis of TD IP data.Firstly,the apparent charge rate of all time-windows is converted into the apparent equivalent resistivity,then the equivalent resistivity of each time-window is inversed by the Least Square Method,and is also translated into charge rate.Finally the spectrum parameters are calculated by the charge rate of each time window.The example has shown that the proposed method in this paper can effectively extract spectrum parameter information from 2.5D TDIP data and the spectrum parameter image can also be realized as well.

关 键 词：COLE-COLE模型 时域激电 频谱参数 反演 

分 类 号：P631.3[天文地球—地质矿产勘探]