Two-component look-up table method combined with conductivity depth imaging method for fixed-wing airborne electromagnetic data

Abstract

The invention relates to a fixed wing aviation electromagnetic data double-component look-up table method combination conductivity depth imaging method. The method includes the steps of firstly, setting up a conductivity-flight height data table which is divided according to time channels; secondly, determining apparent conductivity through a double-component normalized induced electromotive force response combination look-up table and an interpolation algorithm; finally, obtaining the diffusion depth through a skin depth formula, and leading out a double-component combination conductivity depth imaging result. Sufficient underground medium information is obtained compared with the single-component and total field induced electromotive force responses, and therefore distribution of underground media obtained through double-component combination conductivity depth imaging is closer to distribution on the actual ground; the problem of non-uniqueness of the single-component and total field induced electromotive force response and the conductivity is solved, and correctness of the imaging result is ensured; only simple one-dimensional half-space forward modeling calculation, matching search and linear interpolation are conducted in the double-component combination conductivity depth imaging process, the imaging speed is high, efficiency is high, and it is possible that aviation electromagnetic multi-component data are processed in real time.

Description

technical field [0001] The invention relates to a time-domain aeronautical electromagnetic data processing method, in particular to a fixed-wing electromagnetic data double-component joint conductivity depth imaging method. Background technique [0002] The fixed-wing aeronautical electromagnetic detection system is a geophysical detection method based on the fixed-wing aircraft and the electromagnetic response. It uses a dipole-dipole transceiver device to measure the three-component electromagnetic response. It is widely used in geological exploration and oil and gas detection. Compared with general exploration methods, it has the advantages of high exploration efficiency, low cost, and wide exploration area. At the same time, due to its large exploration area, the fixed-wing electromagnetic method has a large amount of data. It is very time-consuming to invert and interpret all the data. Generally, conductivity-depth imaging technology (CDI, Conductivity-Depth Imaging) is...

AI Technical Summary

Problems solved by technology

This method aims at the problem that the traditional fixed-wing aero-EM system uses the total field dB / dt response to explain the imaging loss of multi-component measurement information and the non-uniqueness of dB / dt and conductivity affects the imaging accuracy.

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