大地电磁垂直磁场和倾子正反演方法研究

By 2D and 3D magnetotelluric modeling to discuss the response characteristics of magnetotelluric vertical magnetic-component and tipper under complex geological conditions. Base on this, to study inversion and imaging method of the vertical magnetic-component and tipper, and will realize that the vertical magnetic-component and tipper can be used in the the actual data processing and interpretation. Base on analysis and compare the characteristics of vertical magnetic-component iamging, tipper inversion, apparent resistivity inversion and impedance phase inversion, to build a joint inversion and interpretation system of magnetotelluric multi parameters. The Project significance lies in: as anomaly field, vertical magnetic-component and Tipper has positive affection on raising magnetotelluric interpretation accuracy, and interpretation of vertical magnetic-component and Tipper is helpful to suppress the static shift and topography affects. The multi-parameter joint inversion and interpretation, including the vertical magnetic-component of Magnetotelluric field, MT tipper, the apparent resistivity and impedance phase, will be helpful to reduce multiple solutions of the MT while to study the complex structure, and can improve the accuracy and resolution of magnetotelluric sounding data interpretation. The inversion and imaging theory of vertical magnetic-component and tipper will help to development of magnetotelluric sounding inversion and imaging technology, has a broad application prospects.

通过二、三维大地电磁（MT）正演模拟，研究大地电磁垂直磁场分量和倾子在复杂地质条件下的响应特征，在此基础上开展垂直磁场分量和倾子反演成像方法研究，分析大地电磁垂直分量和倾子在实际资料处理解释中的作用。通过异常场反演成像与视电阻率和阻抗相位反演成像的特点比较，建立一种大地电磁多参数联合解释方法体系。立项的意义在于：作为异常场，垂直磁场分量和倾子在对提高大地电磁解释精度，压制静态位移和地形影响具有积极的意义。结合大地电磁垂直磁场分量、倾子、视电阻率和阻抗相位进行多参数联合解释将有助于降低MT方法研究复杂构造的多解性，提高大地电磁测深资料解释的准确度和分辨率。垂直磁场分量和倾子的反演成像理论将有助于大地电磁测深反演成像技术的发展，具有广阔的应用前景。

项目在大地电磁（MT）正演模拟基础上，研究大地电磁垂直磁场分量和倾子的二、三维正演模拟，完善了视倾子的定义和正演模拟，探讨了其在在地形、静态效应等地质条件下的响应特征；实现了大地电磁二维OCCAM 和三维拟牛顿法倾子资料反演，实现了基于MPI 多进程的并行计算，为降低MT 反演多解性提供手段；进行了垂直磁场三维概率成像研究；结合垂直磁场分量、倾子、视电阻率、阻抗相位和阻抗张量等参数，利用上述反演成像理论，实现了有效的多参数解释方法，提高了大地电磁解释精度；结合前述的各种正反演理论研究，实施了浅部工程和深部构造阵列观测实验，获取的数据验证了反演成像方法的有效性。