3D Inversion of Transient Electromagnetic Data via Time-Frequency Conversion
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Solution Overview
Problem
Current processing methods for electrical source transient electromagnetic data are limited to one-dimensional and quasi-two-dimensional, leading to inefficiencies and an inability to handle multiple transmitting sources, hindering fine processing and three-dimensional inversion.
Innovation Solution
A three-dimensional inversion method utilizing vertical induced voltage and horizontal electric field data to calculate all-time apparent resistivity, followed by time-frequency conversion and three-dimensional inversion using a magnetotelluric algorithm to process frequency-apparent resistivity data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three-dimensional inversion is performed on electrical source transient electromagnetic data using conventional methods, then the inversion comprehensiveness is improved, but the calculation time increases significantly and efficiency decreases
Solution Approach 1:
The patent transforms the inversion problem from the time domain to the frequency domain through time-frequency conversion. By changing the domain parameter from time to frequency, the patent enables the application of efficient frequency-domain inversion algorithms (such as magnetotelluric inversion) that can handle three-dimensional data much faster than conventional time-domain methods, thus resolving the contradiction between inversion comprehensiveness and calculation time
Solution Approach 2:
The patent replaces the conventional mechanical iteration process of three-dimensional inversion with a transformed approach using time-frequency conversion. This substitution allows the use of frequency-domain inversion techniques that are computationally more efficient, reducing the mechanical calculation burden while maintaining inversion accuracy
2Device complexity
If conventional processing methods are used for electrical source transient electromagnetic data, then the processing simplicity is maintained, but the processing dimension is limited to one-dimensional and quasi-two-dimensional
Solution Approach 1:
The patent introduces time-frequency conversion as an additional processing dimension, transforming data from the time domain to the frequency domain. This dimensional transformation enables three-dimensional inversion capabilities while building upon existing one-dimensional and quasi-two-dimensional processing frameworks, thus enhancing processing versatility without completely abandoning simpler methods
3Quantity of substance
If multi-source data is processed using conventional methods, then the data utilization is improved, but the processing capability is insufficient and inversion efficiency decreases
Solution Approach 1:
The patent merges multi-source transient electromagnetic data into a unified frequency-domain representation through time-frequency conversion. By combining data from multiple transmitting sources in the frequency domain, the patent enables simultaneous processing of all sources using efficient three-dimensional inversion algorithms, thereby improving both data utilization and inversion efficiency compared to processing each source separately
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method improves inversion efficiency and accuracy, enabling rapid three-dimensional inversion of multi-source data, enhancing deep geophysical exploration capabilities.
Implementation Method 1
collecting a vertical induced voltage vz and a horizontal electric field ex of electrical source transient electromagnetic
Data Source
AI summary
Three-dimensional inversion method and device for electrical source transient electromagnetic data, and a storage medium are provided. The method includes: step S1, collecting a vertical induced voltage vz and a horizontal electric field ex of electrical source transient electromagnetic; step S2, calculating, by using the vertical induced voltage vz and the horizontal electric field ex, an all-time apparent resistivity; step S3, performing, according to the all-time apparent resistivity, time-frequency conversion to obtain frequency-apparent resistivity data of each observation point; and step S4, performing three-dimensional inversion on the frequency-apparent resistivity data by using a three-dimensional magnetotelluric inversion algorithm.