文章摘要
电位观测系统中近场效应的影响
Impact of near-field effection on potential survey system
  
DOI:
中文关键词: 近场效应  二极装置  电测深  CMOSOL Multiphysics  三维电法
英文关键词: near-field effection  pole-pole array  resistivity sounding  CMOSOL Multiphysics  3D electrical prospecting
基金项目:教育部高等学校博士学科点专项科研基金(20133718110004);青岛经济技术开发区重点科技发展计划项目(2013-1-62);山东省自然科学基金重点资助项目(ZR2011EEZ002);山东科技大学科研创新团队支持计划资助(2012KYTD101);山东科技大学研究生科技创新基金(YC130104)
作者单位
牛超1,施龙青1,肖乐乐1,魏久传1,翟培合1,曹晓莉2 1. 山东省沉积成矿作用与沉积矿产重点实验室山东科技大学 地球科学与工程学院山东 青岛 266590
2. 中国人民武装警察部队 黄金第七支队山东 烟台 264004 
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中文摘要:
      利用CMOSOL Multiphysics软件,正演分析了3层模型近场效应下二极装置电位分布特征.采用电位AM二极观测系统,设计不同的RAM供电电极距,RBN无穷远电极距,利用WDJD-4型激电仪进行野外现场试验.数值模拟表明供电电极距对2个异性点电源场影响较大,但在一定的无穷远极距范围内畸变可以矫正.现场电测深试验表明,小供电电极距RAM情况下,二极测深曲线不能正确反映电介质的电性分布.电位观测系统的无穷远极距RBN使得测深曲线偏离了正常测深曲线,甚至产生了歧义的负电阻率拐点.通过传统电场理论分析,利用不同观测装置下的视电阻率计算公式推导了二极装置非无穷远条件下的校正公式.测深数据校正误差表明,在无穷远极距满足1.5RAO≤RBO≤5RAO(RAO为供电电极A距中点O的距离,RBO为供电电极B距中点O的距离)的情况下,校正误差小于5%,可利用的无穷远电极极距提高3倍,并成功应用于井下工作面实际探测中.
英文摘要:
      Using CMOSOL Multiphysics software, the near field effection was analyzed, which of pole-pole potential distribution in the three layer model. The potential of AM observation system was used to design different AB corrent electrode spacing, and distance of MN electric potential, WDJD-4 field test was adopted. Numerical simulation shows that the corrent electrode spacing greater influence on the two opposite the point source field, but the distortion at infinite distance within a certain range can be corrected. Field electrical sounding show that: small corrent electrode distance of AB cases, pole-pole sounding curve can not correctly reflect the electrical distribution of dielectric. Infinite distance RBN potential observation system makes the sounding curves deviate from the normal sounding curve, and even cause ambiguity negative resistivity inflection point. By the traditional electric field theoretical analysis, the apparent resistivity observation device using different formulas for calculating the correction formula of diode device is pushed to the near field under the influence of non infinite electrode. Sounding data correction error analysis shows that, in the infinite distance satisfies 1.5RAO≤ RBO≤ 5RAO , the correction error is less than 5%, can use the infinite electrode distance is increased by three times, and successfully applied to practical detection of underground working face.
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