This paper puts forward the basic principle for definition of apparentresistivity in electrical prospecting, and on such a basis discusses merits anddemerits of various sorts of apparent resistivity definition in MT, TEMS andFEMS methods with some suggestions for improvement made. Studies showthat in MT method the apparent resistivity defined by using real part ofplane impedance or given in time domain is very effective, which can wellrecognize the good conductive layer, while the apparent resistivity defined byusing imaginary part of plane impedance yields the worst result. So far asTEMS method is concerned, the whole-region definition of apparent resistivityis more effective than distant-region or nearby-region approximate definition.Studies also reveal that the whole-region apparent resistivity defined by timederivative of magnetic field sometimes has multi-solutions or even nosolution,whereas the apparent resistivity defined by magnetic field itseif is quiteeffective. For FEMS method, similar discussion is also made concerning thedefinition of whole-region apparent resistivity, and the result obtained, thoughnot so ideal as the result of TEMS method, is somewhat better than the appa-rent resistivity response defined under the condition of commonly-used largeand small induction values. This paper has made physical interpretation of thefalse extremum effect of apparent resistivity response curve that appears inelectromagnetic sounding method.
出版日期: 1991-08-24
引用本文:
殷长春, 朴化荣. 电磁测深法视电阻率定义问题的研究[J]. 物探与化探, 1991, 15(4): 290-299.
Yin Changchun, Piao Huarong. A STUDY OF THE DfYINITION OF APPARENTRESISTIVITY IN ELECTROMAGNETIC SOUNDING. Geophysical and Geochemical Exploration, 1991, 15(4): 290-299.
[1] Ваньян Л,Л::电磁测深基础,煤炭工业出版社,1967.
[2] 朴化荣:电磁测深法原理,地质出版社,1990.
[3] 朴荣化、殷长春:频率测深正演问题滤波算法及人机联作反演,物探化探计算技术,1987,第9卷,第2期.
[4] 朴化荣、殷长春:利用G-S逆拉氏变换法计算瞬变测深正演问题,物探化探计算技术,1987,第9卷,第4期.
[5] 朴化荣、殷长春:频率测深水平磁场的正演计算及应用,物探化探计算技术,1989,第11卷,第3期.
[6] Spies, B. R Eggers, D. E, The use and misuse of apparent resistivity in elcctlomagnetic mcthoels,Geophys, 1986, 1462-1471.
[7] 长谷川健:水平电気双極子にょろ履状大地のステッア応答と见掛道電铱率について,物理探鉱,1985, vol.38. No. 3