基于cole-cole复电阻率模型的线源可控源有限元数值模拟  

Finite element numerical simulation on line controlled source based on cole-cole model

作　　者：王珺璐[1] 刘明文 李荡[1] 李建华[1] 林品荣[1] 王萌[3] 

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,廊坊065000 [2]重庆地质仪器厂,重庆400033 [3]中国国土资源航空物探遥感中心,北京100083

出　　处：《物探化探计算技术》2015年第1期32-39,共8页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家重大科学仪器设备开发专项(2011YQ050060);国家高技术研究发展计划863计划(2014AA06A610);地质大调查项目(12120113101500;12120113031700);中央级公益性科研院所基本科研业务费项目(AS2014D01)

摘　　要：受激发极化效应的影响,大地中岩(矿)石电阻率是一个与频率、电化学性质等因素有关的复电阻率。接收到的电磁场信号中,包含了电磁感应效应以及激发极化效应双重因素的影响。将cole-cole复电阻率模型引入二维线源可控源正演理论,加载伪delta函数,实现了含激发极化效应的线源可控源有限元数值模拟。计算了不同极化参数的二维地质体线源可控源的影响特征。结果表明:线源可控源响应对IP效应反映明显,视电阻率出现增高的特征;低阻高极化相对于高阻高极化模型受IP效应影响更大,从低阻中提取IP效应更加乐观。该研究为实现从复杂地质条件下CSAMT信号提取IP效应奠定了基础。Influenced by the induced polarization effect,the resistivity of rock （ore）is a complex resistivity,which related to many factors such as the transmitting frequency,the electrochemical properties,et al.The received electromagnetic signal contains the electromagnetic induction effect and induced polarization effect.In 2-D line controlled source forward modeling theory,we introduced the cole-cole complex resistivity model to study the characteristics of the induced polarization effect. Loading pseudo delta function,we realized the finite element numerical simulation on line controlled source based on cole-cole model.Calculating the response characteristics of the two dimensional geologic body with different polarization parameters. The results show that the IP effect leads to the increasing of apparent resistivity,the influence of low resistance model by the IP effect is bigger than the high resistance model,and extracted IP effect from the low resistance is more optimistic.The research laid a foundation for realizing the extraction of the IP effect in the CSAMT signal.

关 键 词：COLE-COLE模型 激发极化效应 有限单元 可控源电磁法 

分 类 号：P631.324[天文地球—地质矿产勘探]