不同噪声水平高密度电法的分辨率和勘探深度研究  

The study on ERT resolution and depth of investigation based on different levels of noise

作　　者：邢润林 陈儒军[1,2,3] 刘海飞 王小杰[1,2,3] 陈兴生 XING Runlin;CHEN Rujun;LIU Haifei;WANG Xiaojie;CHEN Xingsheng(School of Geosciences and Info-Physics,Central South University,Changsha410083,China;Key Laboratory of Nonferrous Resources and Geological Hazard Detection of Hunan Province, Central South University,Changsha410083,China;Champion Geophysical Technology Ltd,Changsha410082,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]中南大学有色资源与地质灾害探查湖南省重点实验室,长沙410083 [3]湖南强军科技有限公司,长沙410083

出　　处：《物探化探计算技术》2019年第1期68-79,共12页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(41774149)

摘　　要：电位噪声是影响高密度数据采集质量进而影响反演成像解释可靠性的重要因素。通过模拟四种不同水平电位噪声并获得噪声数据,对比分析四种装置(温纳装置、三极装置、偶极装置、温纳-施伦贝谢装置),在噪声条件下的反演模型电阻率差异,并评估各装置对噪声响应的灵敏程度以及不同噪声水平对反演模型分辨率和各装置的勘探深度的影响。将反演模型分辨率和各装置勘探深度进行了量化,定量分析模型分辨率和不同装置勘探深度在各噪声水平下的变化规律,综合评估噪声对四种装置反演模型分辨率和勘探深度的影响得出:①偶极和三极装置对噪声灵敏程度较高,而温纳和温施装置对噪声灵敏程度相对较低;②噪声对深层地电模型分辨率影响较大,在有效分辨地电模型的深度范围内,温纳和温施装置的模型分辨率降低2/5,三极装置降低一半,偶极装置降低3/5左右;③勘探深度在噪声影响下均有所减小,温纳和温施装置减小约1/4,偶极和三极装置减小约1/3。Potential noise is a key factor that affects the quality of ERT data acquisition and then affects the reliability of the inversion imaging interpretation.Inversion resistivity model differences of four kinds of configurations(Wenner,pole-dipole,dipole-dipole,Wenner-Schlumberger)are comparatively analyzed by simulating four different levels of potential noise and then obtain noisy data sets in this paper.Moreover,the effect of each configuration on the sensitivity of noise response and the effect of different levels of noise to the four configurations'inversion model resolution and depth of investigation are evaluated.In addition,we quantified the inversion model resolution and the depth of investigation of each configuration,quantitative analysis the transformation law of each levels of noise to inversion model resolution and depth of investigation of different configurations.And comprehensively evaluate the influence of the four configurations'inversion model resolution and depth of investigation from different levels of noise.The final conclusions:the sensitivity degree of dipole-dipole and pole-dipole configurations to each noise level is higher,while the Wenner and Wenner-Schlumberger configurations'is lower.Noise has a great impact on the deep geo-electric model resolution in the depth range of resolving the geo-electric model effectively.The model resolution of Wenner and Wenner-schlumberger configuration is reduced by 2/5,pole-dipole configuration half and dipole-dipole configuration 3/5.The depth of investigation,to some extent,decreases for four configurations under the influence of noise.Wenner and Wenner-schlumberger configurations'are reduced by about 1/4,while pole-dipole configuration and dipole-dipole configurations'by about 1/3.

关 键 词：电位噪声 最小二乘反演 分辨率 勘探深度 

分 类 号：P631.3[天文地球—地质矿产勘探]