摘要
通过线性组合,单极—单极电位可以转换到各种装置的视电阻率。但在实际电阻率测量和正演数值模拟中,得到的电位不可避免地存在误差,从而对视电阻率计算产生偏差。本文讨论了电位随机误差及三维有限差分数值计算中的电位误差对视电阻率计算的影响,结果表明,在单极—单极电位中,微小的随机误差会造成偶极—偶极装置视电阻率很大的误差,而对称四极视电阻率的误差则相对较小。数值计算中的电位误差对视电阻率计算也有一定程度影响,误差分析的结果证实了文中的观点。
Pole-pole electrical potential can be transformed to apparent resistivity of any electrode arrangement by linear combination. However, it is impossible to avoid introducing noises into electrical potential in field survey and numerical forward modeling, which will cause uncertainty for apparent resistivity. In this paper ,we discuss the effects of random potential error and error resulted from the numerical computation of 3-D finite-difference modeling on the apparent resistivity. The results show that even modest levels of noise in the pole-pole potential will cause big uncertainty for the apparent resistivity of dipole-dipole array,but the error in the apparent resistivity of symmetrical quadrupole array is not very large. The potential error resulted from the numerical computation also has uncertainty for the apparent resistivity to a certain extent. The points of view in the paper have been proved by the results of error analysis.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2003年第4期439-443,共5页
Oil Geophysical Prospecting
基金
国家自然科学基金(编号:40004005)
国土资源部"十五"重点科技项目资助
关键词
视电阻率
偶极
单极
三维有限差分数值
电法测量
电位差
地球物理勘探
apparent resistivity,pole-pole,symmetrical quadrupole, dipole-dipole, potential, 3-D finite-difference numerical modeling
