Surface Wave Prospecting Using Vector Wavenumber Transform

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Solution Overview

Problem

Inaccurate surface wave prospecting results in complex urban areas due to the requirement for linearly arranged observation systems and detectors, making it difficult to obtain high-resolution stratigraphic structure images.

Innovation Solution

An active source surface wave prospecting method using a vector wavenumber transform algorithm to collect and process surface wave data, allowing for arbitrary placement of detectors and extracting dispersion curves to establish an initial stratigraphic model for joint inversion, reducing construction difficulties and improving adaptability and accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If linear arrangement of observation system and seismic source is used, then measurement precision is improved, but device complexity and ease of operation deteriorate due to strict placement requirements

Engineering Contradiction:

Improvestratigraphic structure imaging accuracyVSAvoiddetector placement flexibility

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent transforms the surface wave data from time domain to frequency-wavenumber domain using Fourier transform and wavenumber analysis. By changing the parameter domain from time to frequency-wavenumber space, the method enables accurate stratigraphic imaging without requiring linear detector arrangements, thus improving operational flexibility while maintaining measurement precision

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical constraint of linear physical arrangement with a mathematical transformation approach. Instead of relying on physical linear positioning of detectors, the method uses wavenumber domain transformation and dispersion curve analysis to achieve the same imaging accuracy, substituting mechanical positioning requirements with signal processing operations

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If equal interval placement of wave detectors is used, then measurement precision is improved, but adaptability deteriorates in complex urban areas

Engineering Contradiction:

Improvesurface wave prospecting image resolutionVSAvoidprospecting site adaptability

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent changes the analysis domain from time domain to frequency-wavenumber domain, which allows the use of irregularly spaced detectors. The wavenumber transformation and dispersion energy graph methods are insensitive to detector spacing, enabling high-resolution imaging in complex urban environments where equal interval placement is impractical

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops a universal processing method that works with various detector arrangements (linear, irregular, equal interval, or non-equal interval). The wavenumber domain transformation and joint inversion techniques provide a multi-functional approach that adapts to different site conditions while maintaining consistent imaging quality

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If only fundamental mode dispersion curve is used, then ease of operation is improved, but measurement precision deteriorates due to increased uncertainty

Engineering Contradiction:

Improveinversion calculation simplicityVSAvoidstratigraphic structure imaging accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent merges the fundamental mode dispersion curve with higher mode dispersion curves in a joint inversion process. By combining multiple dispersion curves from different modes, the method reduces inversion uncertainty and improves stratigraphic imaging accuracy while maintaining operational simplicity through automated processing

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11137511B2Active source surface wave prospecting method, surface wave exploration device and computer-readable storage medium

Publication Date: 2021.10.05 SOUTHERN UNIVERSITY OF SCIENCE AND TECHNOLOGY

AI summary

Active source surface wave prospecting method which is applicable to technical field of geological prospecting, comprising: collecting, by detector at preset station, surface wave data transmitted from seismic source; calculating to obtain dispersion energy graph on basis of vector wave-number transformational algorithm and according to surface wave data; extracting dispersion curve from dispersion energy graph, dispersion comprising base-order surface wave dispersion curve and high-order surface wave dispersion curve; establishing initial stratigraphic model according to base-order surface wave dispersion curve and high-order surface wave dispersion curve, performing, according to initial stratigraphic model, joint inversion on base-order surface wave dispersion curve and high-order surface wave dispersion curve to obtain inverting data of stratigraphic texture. Accuracy of surface wave prospecting result is effectively improved. Further provided are surface wave exploration device and terminal device.