Whole-area multi-source electromagnetic sounding method and multi-field-source multi-component data joint inversion technology

Abstract

The invention relates to the technical field of earth deep detection, in particular to a whole-area multi-source electromagnetic sounding method and a multi-field-source multi-component data joint inversion technology. The method comprises a whole-area multi-source electromagnetic sounding working device and a data processing explanation technology. Whole-area multi-source electromagnetic sounding is a novel artificial source frequency domain electromagnetic exploration method, measurement is carried out in any area where an electric dipole source formula is established, electromagnetic induction sounding and geometric sounding are organically fused, and one or more components of an electromagnetic field are measured. In order to eliminate or suppress the influence of the field source effect, a whole-area observation alternate coverage observation system similar to three-dimensional seismic exploration is adopted, and the electrical structure of the underground geologic body is obtained through direct inversion calculation of a single component or multiple components of multiple observation systems. The invention provides a land controllable source electromagnetic measurement mode for full-region true three-dimensional observation and a corresponding three-dimensional data joint inversion calculation technology, and provides technical support for exploration of energy, mineral products, water and other strategic resources.

Description

technical field [0001] The invention relates to the technical field of deep earth detection, in particular to a whole-region multi-source electromagnetic sounding method and a joint inversion technology of multi-field source and multi-component data. Background technique [0002] "Advancing into the deep earth is a strategic scientific and technological problem that we must solve." Carrying out deep earth exploration is not only a need to solve major basic theoretical problems in geosciences, but also a strategic choice to ensure the security and sustainable development of energy resources. The main problem of deep earth exploration is how to see through the fine structure of the earth, accurately discover deep resources and extend the underground space. Geophysical detection technology is the most critical. The technical problems of physical detection need to be solved urgently. [0003] Terrestrial controlled source electromagnetic methods, such as the common controlled s...

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Problems solved by technology

[0007] However, both the CSAMT method and the WFEM method ignore the geological conditions between the emission source and the far interval, and between the emission source and the wide area in the actual data collection and processing process, and only collect and make data for the observation area corresponding to a single emission source. Inversion, interpretation and inference work, which brings large errors or even wrong conclusions to the data processing results, and affects the detection accuracy of the artificial source frequency domain electromagnetic method

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