运用对称四极测深研究层状极化介质频谱特征

来源期刊：中南大学学报(自然科学版)2003年第1期

论文作者：席振铢 张友山 张宪润

文章页码：8 - 10

关键词：频谱激电； 介质； 谱特征； 时间常数

Key words：multi-frequency IP； earth； spectral characteristics； time constant

摘    要：不考虑电磁感应,用Cole-Cole模型表征极化介质复电阻率,正演计算对称四极装置测深2种典型层状极化介质频谱激电谱曲线和其2个极距的频谱.计算结果表明,时间常数值较大的极化层(如炭层等)所反映的相位曲线,当频率为0.01～1 000 Hz时,随着频率提高,相位负异常递减;时间常数τ值较小(如块状硫化物等)的极化层反映的相位谱与τ值较大的极化层所反映的规律不同;在同样的频率范围内,随着激发频率的提高,相位负异常递增,而后又递减;时间常数τ值较大的极化层的相位频谱特征频率要远远小于τ值较小的极化层的相位频谱特征频率.这些谱特征为区分矿与非矿提供了理论依据.

Abstract: Without electromagnetic coupling, the complex resistivity of Cole-Cole relaxation model simulates the polarized earth . At the same time, two typical spectral curves and spectrum of two a-space are forwarded with Schlumberger array over a multi-layered medium. Moreover, the phase response of the medium with higher constant (such as graphites) is gradually decreasing from 0. 01 Hz to 1 000 Hz. The phase response of the medium with lower time constant (such as massive sulfides) is increasing, and then decreasing. The special frequencies of medium with higher time constant are much smaller than that of medium with lower time constant. As a result, the spectral characteristics can be used to research mineral discrimination.