摘要
设计了多个1D/3D、2D/3D模型进行数值模拟分析,从模型三维响应和二维响应的差异大小和反演结果对比两个方面,分析了利用二维反演解释方法来逼近解释三维地质模型的适用性问题。分析结果表明:在异常体沿走向长度逐渐缩短的过程中,模型的三维特性逐渐增强,采用TM极化模式的二维反演结果基本保持不变,TE极化模式的二维反演结果逐渐产生畸变,表明TM极化模式对模型二维性的要求远远低于TE极化模式,TE/TM联合模式二维反演效果通常介于前两者之间,有时优于TM极化模式的二维反演结果。综合得出:一般条件下采用TM极化模式进行二维反演通常可以较好地重建原始模型,TE/TM联合二维反演结果在与TM极化模式反演结果整体电性特征相似的情况下,其对模型电阻率值的反演优于TM极化模式。
Several 1D/3D and 2D/3D models were designed for numerical simulation. The authors analyzed the applicability of the three dimensional geological model by using the two-dimensional inversion interpretation method from two aspects,i.e.,the difference between the model＇s 3D response and 2D response and the contrast of the results. Some conclusions have been reached： If the abnormal body is gradually shortened along the length of the strike,the model＇s three-dimensional characteristics gradually increase. The 2D inversion results using TM polarization mode remain basically unchanged,and the 2D inversion results of TE polarization mode gradually produce distortion,indicating that TM polarization mode has much lower 2D model requirements than TE polarization mode. The effect of 2D inversion of TE/TM mode is usually between the effect of the above two modes,and sometimes better than the two-dimensional inversion result of TM polarization mode. It is concluded that the 2D inversion using TM polarization mode under normal conditions can usually reconstruct original model well,and in the case that the overall electrical characteristics of TE/TM mode inversion results are similar to those of TM polarization mode,the model resistivity value of TE/TM mode inversion result is superior to that of the TM polarization mode.
作者
仇根根
吕琴音
彭炎
裴发根
QIU Gen-Gen;LYU Qin-Yin;PENG Yan;PEN Fa-Gen(Institute of Geophysical and Geochemical Exploration,Langfang 065000,Chin)
出处
《物探与化探》
CAS
CSCD
北大核心
2018年第4期791-797,共7页
Geophysical and Geochemical Exploration
基金
国家重点研发计划项目"华南北段地壳三维电性结构探测研究"(2016YFC0600201-4)
国家自然科学基金项目"江南造山带东段岩石圈三维电性结构研究"(41574068)
中国地质调查局地质大调查项目"钦杭结合带及邻区深部地质调查"和"武夷山成矿带区域大地电磁测深"(121201108000160913
12120114005801)
地科院基本科研项目"超稀网度条件下大地电磁测深静校正技术研究"(AS2016J12)
