摘要
为分析高密度电阻率法对异常体的探测效果,设计均匀介质中水平相邻的高、低阻异常体模型,进行了不同装置正、反演模拟。结果表明:对于同一地电模型,由于高密度电法不同装置电极排列方式不同,数据采样方式及覆盖范围不同,结果也不相同。温纳装置水平方向和垂直方向采集数据分布最均匀,信号及抗干扰能力强,信噪比最高,但受数据采集及分布方式影响,其垂直方向分辨率优于水平方向分辨率。偶极装置水平方向数据覆盖较垂直方向覆盖均匀、密度高,水平方向分辨率高于垂直方向,随着隔离系数增大,数据密度减小、信号变弱、分辨率降低。斯伦贝谢装置模拟结果与温纳α装置模拟结果相似,但其水平方向对低阻异常的分辨率较温纳α装置强,在需要兼顾测深和不同方向精度的情况下可选择使用,但随电极距系数n增大,该装置信噪比降低,抗干扰能力变差。二极装置勘探深度最大,但信号也最弱,水平方向和垂直方向分辨率低,其反演的异常体大小和形态较差。三极装置信号比二极装置增强,水平方向和垂直方向分辨率有所提高,但会破坏结构的对称性,若综合考虑信号强度、分辨率及勘探深度等因素,三极装置为佳。
In order to analyze the detection effect of high density resistivity method on abnormal bodies, the models of high and low resistivity anomaly bodies with horizontal adja- cent in homogeneous medium are designed, and different devices with the forward and in- verse modeling are carried out. Results show that for the same geoelectric model, the data sampling method and the coverage range are different because of the different electrode ar- rangement of different devices in the high--density electrical method and the results are al- so different. The horizontal and vertical data of Wenner device are fairly distributed, and the signal and its anti--interference ability are strong, and the signal to noise ratio is the highest, but the vertical resolution is superior to the horizontal direction under the influ- ence of data acquisition and distribution. The horizontal data coverage of the dipole is more uniform than that of the vertical, and the horizontal resolution is higher than that of the vertical. With the increase of the isolation coefficient, the data density decreases, the signal weakens and the resolution decreases. The simulation results of Schlumberger device are similar to Wenner--alpha device, but the horizontal resolution to low resistivity anomaly is stronger than the Wenner--alpha device, which can be selected when considering both sounding and accuracy of different directions, but with the increases of electrode distance coefficient （n）, the signal--to--noise ratio of this device is reduced and the anti--interfer- ence ability is poor. The pole--pole device has the largest exploration depth and the wea- kest signal, and the resolution is low, and the inversion size and shape of the anomalous body are poor. The signal of the pole--dipole device is stronger than pole--pole device, and the resolution of horizontal and vertical direction is improved, but it will destroy the symmetry of the geological structure. If the signal intensity, resolution and exploration depth are taken into account, the tripole device is better.
作者
占文锋
张浩
Zhan Wenfeng;Zhang Hao(School of Architectural and Surveying ＆ Mapping Engineer,Beijing Polytechnic College,Beijing 100042,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology（Beijing）,Beijing 100083,China)
出处
《工程地球物理学报》
2018年第6期755-763,共9页
Chinese Journal of Engineering Geophysics
基金
北京市教育委员会科技计划项目(编号:KM201810853006)
关键词
高密度电法
装置形式
正演
反演
对比分析
high density resistivity method
device forms
forward modeling
inversion
comparative analysis
