Bedrock fracture intrinsic parameter quantitative determination method and system based on all-angle domain amplitude and phase joint inversion

By using a combined amplitude and phase inversion method across the entire angular domain, the problem of multiple solutions in the quantitative determination of bedrock fracture aperture by ground-penetrating radar was solved, achieving high-precision fracture parameter inversion, which is suitable for the determination of bedrock fracture parameters under complex geological conditions.

CN121763422APending Publication Date: 2026-03-31YELLOW RIVER CONSERVANCY TECHN INST
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Patent Information

Application Number
CN202511832239.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-08
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Existing technologies for quantitatively determining bedrock fracture aperture using ground-penetrating radar suffer from insufficient information utilization, reliance on amplitude information leading to severe ambiguity, inaccurate system effect correction, and difficulty in accurately inverting fracture parameters under complex geological conditions.

Method used

A method combining amplitude and phase inversion across the entire angular domain is adopted. Data is acquired through a common center point mode. Combining Fresnel equations and thin-layer interferometry theory, an objective function constraining amplitude and phase is constructed. A global optimization algorithm is used to simultaneously invert fracture aperture, dielectric constant of infill material, and orientation parameters for system effect correction.

Benefits of technology

It achieves high-precision, low-multiplicity quantitative determination of fracture parameters, adapts to complex geological conditions, reduces reliance on prior information about the properties of infill materials, and improves the accuracy and applicability of inversion.

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Abstract

The invention belongs to the technical field of geophysical exploration, and particularly relates to a method and a system for quantitatively measuring intrinsic parameters of bedrock fractures based on all-angle domain amplitude and phase joint inversion. The method comprises the following steps: acquiring geological radar reflection data of a target fracture at a plurality of incident angles; synchronously extracting data sequences of amplitude change along with angles and phase change along with angles; establishing a fracture reflection theoretical model; constructing a target function jointly constrained by the amplitude residual and the phase residual; and adopting a global optimization algorithm to minimize the target function, and synchronously inverting to obtain the fracture opening, the filler dielectric constant and the occurrence parameter. According to the invention, through the combined constraint of the amplitude and the phase, the inversion multiplicity is effectively inhibited; accurate system effect correction is adopted, so that the reliability of large-angle data is ensured; according to the method, multi-parameter synchronous inversion without prior hypothesis is realized, the inversion precision is small in relative error, the method is obviously superior to a traditional method, and the method has important engineering application value.
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