Based on the study on electromagnetic field migration by Zhdanov, we have proposed an improved method for the weak points in the research. Firstly, the initial background resistivity should be determined by using 1-D ...Based on the study on electromagnetic field migration by Zhdanov, we have proposed an improved method for the weak points in the research. Firstly, the initial background resistivity should be determined by using 1-D inversion results. Then in the process of continuation, the results are corrected and calculated layer by layer by the iteration method, so that more exact resistivity can be obtained. Secondly, an improved algorithm for finite-difference equation is studied. According to the property of electromagnetic migration field, the algorithm is designed by means of grids varying with geometric progression in the longitudinal direction. Being improved by the techniques mentioned above, better results are obtained by the new method, which has been verified by both the theory model and practical data.展开更多
In shallow-water areas,the marine magnetotelluric(MT)method faces a challenge in the investigation of seabed conductivity structures due to electrical and magnetic noises induced by ocean waves,which seriously contami...In shallow-water areas,the marine magnetotelluric(MT)method faces a challenge in the investigation of seabed conductivity structures due to electrical and magnetic noises induced by ocean waves,which seriously contaminate MT data.Ocean waves can affect electric and magnetic fields to different extents.In general,their influence on magnetic fields is considerably greater than that on electric fields.In this paper,a complex adaptive filter is adopted to reduce wave-induced magnetic noises in the frequency domain.The processing results of synthetic and measured MT data indicate that the proposed method can effectively reduce wave-induced magnetic noises and provide reliable apparent resistivity and phase data.展开更多
大地电磁测深法(Magnetotelluric,MT)作为勘察地质构造和探寻具有工业价值的矿产、油气资源的勘探方法,是地球物理电法勘探中实践应用广泛的重要分支学科。研究表明MT资料的处理是提高原始资料可靠性的重要步骤,为后续的正、反演建立合...大地电磁测深法(Magnetotelluric,MT)作为勘察地质构造和探寻具有工业价值的矿产、油气资源的勘探方法,是地球物理电法勘探中实践应用广泛的重要分支学科。研究表明MT资料的处理是提高原始资料可靠性的重要步骤,为后续的正、反演建立合理的地电模型提供科学的数据基础。因此,着重介绍加拿大凤凰地球物理公司研发的V5 System 2000系列软件在MT资料处理中的使用方法,并结合实测数据归纳总结用其进行数据处理的原理,对提高资料品质的各种技术进行探讨。展开更多
文摘Based on the study on electromagnetic field migration by Zhdanov, we have proposed an improved method for the weak points in the research. Firstly, the initial background resistivity should be determined by using 1-D inversion results. Then in the process of continuation, the results are corrected and calculated layer by layer by the iteration method, so that more exact resistivity can be obtained. Secondly, an improved algorithm for finite-difference equation is studied. According to the property of electromagnetic migration field, the algorithm is designed by means of grids varying with geometric progression in the longitudinal direction. Being improved by the techniques mentioned above, better results are obtained by the new method, which has been verified by both the theory model and practical data.
基金supported by the National Natural Science Foundation of China(Nos.91958210 and 41904075)。
文摘In shallow-water areas,the marine magnetotelluric(MT)method faces a challenge in the investigation of seabed conductivity structures due to electrical and magnetic noises induced by ocean waves,which seriously contaminate MT data.Ocean waves can affect electric and magnetic fields to different extents.In general,their influence on magnetic fields is considerably greater than that on electric fields.In this paper,a complex adaptive filter is adopted to reduce wave-induced magnetic noises in the frequency domain.The processing results of synthetic and measured MT data indicate that the proposed method can effectively reduce wave-induced magnetic noises and provide reliable apparent resistivity and phase data.
文摘大地电磁测深法(Magnetotelluric,MT)作为勘察地质构造和探寻具有工业价值的矿产、油气资源的勘探方法,是地球物理电法勘探中实践应用广泛的重要分支学科。研究表明MT资料的处理是提高原始资料可靠性的重要步骤,为后续的正、反演建立合理的地电模型提供科学的数据基础。因此,着重介绍加拿大凤凰地球物理公司研发的V5 System 2000系列软件在MT资料处理中的使用方法,并结合实测数据归纳总结用其进行数据处理的原理,对提高资料品质的各种技术进行探讨。
