利用新的MT视电阻率定义识别薄互层

• 作 者: 吴小平 徐果明 卫山 邓干金
• 机 构: 中国科技大学地球与空间科学系,中国科技大学地球与空间科学系,中国科技大学地球与空间科学系,中国科技大学地球与空间科学系
• 出 处: 石油地球物理勘探
• 发表日期: 1998年03期
• 关键词: 视电阻率 MT 薄互层 大地电磁测深 地电剖面 正演 电模型 反演研究 纵向电导 相位曲线

在MT方法中，广泛使用Cagniard定义的视电阻率。此种定义的视电阻率曲线不仅有明显的振荡性，而且对地电剖面的中间薄层反映很不明显。Basokur在此基础上又定义了一种性质更好的视电阻率，它能较好地减小视电阻率曲线的振荡性和分辨地电剖面的中间薄层。本文将这种新定义的视电阻率用于MT方法中薄互层地电模型的正、反演研究，不仅能更好地反映地下介质的电性变化，而且对薄互层的分辨率也有显著的提高。即使是较复杂的薄互层模型，也能获得较好的结果。

In the MT method, the apparent resistivity defined by Cagniard is widely used. This definition of apparent resistivity curve not only has obvious oscillation, but also reflects the middle layer of the geoelectric profile is not obvious. On the basis of this, Basokur defines a better apparent resistivity, which reduces the oscillation of the apparent resistivity curve and distinguishes the middle layer of the geoelectric profile. In this paper, the newly defined apparent resistivity is used to study the inversion of the thin interbedded geoelectric model in the MT method, which can not only better reflect the electrical change of the underground medium, but also have the resolution of the thin interbed Improved significantly. Even the more complex thin interbed model, but also get better results.