Method and system for improving geologic body boundary detection capability of aeromagnetic data

Abstract

The invention belongs to the field of aeromagnetic survey, and particularly provides a method and system for improving aeromagnetic data geologic body boundary detection capacity, and the method comprises the steps: S1, obtaining an actually measured or calculated full magnetic gradient tensor data matrix M; s2, calculating according to the full magnetic gradient tensor data matrix M in the step S1 to obtain three characteristic values lambda 1, lambda 2 and lambda 3 of the matrix; s3, calculating according to the full-magnetic gradient tensor data matrix M in the step S1 to obtain a total module value A of the matrix; s4, establishing a boundary detection function E, and obtaining the maximum value max (E) of the E; e = lambda1 * lambda2 * lambda3 * A; and S5, delta max (E) is calculated to obtain a new boundary detection equalization filter iLP, and delta is an adjustment coefficient of equalization depth abnormality. According to the scheme, the method has high resolution, high tilt magnetization resistance and high noise interference resistance, boundary information of aeromagnetic data target geologic bodies with different amplitudes can be balanced, and redundant false boundary anomalies can be avoided. The calculation stability is improved, the signal-to-noise ratio is enhanced, and the transverse resolution can also be improved.

Description

technical field [0001] The invention relates to the field of aeromagnetic surveying, and more specifically, to a method and system for improving the ability to detect the boundaries of geological bodies from aeromagnetic data. Background technique [0002] The airborne magnetic field measurement data is a comprehensive reflection of the magnetic field information of magnetic geological bodies of different depths, shapes, and scales on the observation surface; due to the superposition effect of the magnetic field, some anomalies with certain geological significance become complicated. It is difficult to identify them physically, which brings difficulties to geological interpretation. With the continuous development and maturity of engineering technology and magnetic gradient tensor detection instrument research and development technology, the application of magnetic tensor data to analyze and deal with the above problems has also been developed accordingly. The magnetic tens...

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Problems solved by technology

[0003] Although the local phase method (Local Phase, LP) can detect the boundary of the aeromagnetic data target geological body and highlight more useful information, the disadvantage of this method is that the numerical stability is weak and it is easy to produce false anomaly boundaries, and when the denominator or close to 0, there is an "analytic singularity" in the local phase method, which will make the calculation result unstable and affect the actual application effect

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