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A Method for Recognition of Geological Body Boundary Based on 3D Structural Tensor

A technology for boundary identification and three-dimensional structure, which is applied in measurement devices, electrical/magnetic exploration, and geophysical surveys. , high resolution and precision effects

Active Publication Date: 2022-05-13
JILIN UNIV
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a three-dimensional structural tensor-based aeromagnetic data geological body boundary identification method to solve the problems of low precision and high resolution in boundary identification in complex geological conditions such as deep and shallow superposition anomalies and adjacent superposition anomalies. bad question

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  • A Method for Recognition of Geological Body Boundary Based on 3D Structural Tensor
  • A Method for Recognition of Geological Body Boundary Based on 3D Structural Tensor
  • A Method for Recognition of Geological Body Boundary Based on 3D Structural Tensor

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Embodiment

[0054] Taking the measured aeromagnetic data in the Zhurihe area as an example, the fault distribution in this area is identified through the boundary identification filter based on the structural tensor.

[0055] Specific steps are as follows:

[0056] A. According to the measured aeromagnetic anomaly f in the Zhurihe area, see Figure 2(a), data preprocessing technology is used for data processing, including magnetic compensation, diurnal correction, normal field correction, altitude correction, lag correction, and leveling. And use the space domain derivation method to get the abnormal multi-order horizontal derivative (gradient value) Obtain multi-order vertical derivatives (gradient components) by derivation in the frequency domain

[0057] B. Gradient value obtained according to actual measurement or calculation Define the construction tensor matrix, the expression is:

[0058]

[0059] C. Use boundary identification filter NSED1 to identify the boundary of aero...

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Abstract

The invention relates to a three-dimensional structure tensor-based aeromagnetic data geological body boundary recognition method, comprising: obtaining measured aeromagnetic anomaly data and preprocessing; performing space domain calculation on the preprocessed data; performing preprocessed data Calculate in the frequency domain; use the data calculated in the space domain and the data calculated in the frequency domain to obtain horizontal derivatives, multi-order vertical derivatives and construct tensor matrices to obtain boundary identification filter NSED1 and boundary identification filter NSED2; the present invention breaks through the previous boundary identification The filter adopts the idea of ​​single gradient and gradient of the same order to define the filter, and the boundary identification filter with the participation of multiple gradient components can be obtained more clearly in complex geological conditions such as deep and shallow superposition anomalies, adjacent superposition anomalies, positive and negative superposition anomalies, etc. , Reliable delineation results of the horizontal position of geological bodies, avoiding the interference information caused by superimposed anomalies, and improving the boundary position enhancement and extraction capabilities of weak anomalies and deep anomalies corresponding to geological bodies.

Description

technical field [0001] The invention relates to the technical field of earth science, in particular to a three-dimensional structure tensor-based recognition method for a geological body boundary of aeromagnetic data. Background technique [0002] With the continuous development of aeromagnetic detection systems based on mobile platforms such as manned aircraft, unmanned aerial vehicles, and unmanned airships, the rapid interpretation of large-area, high-precision data obtained by aeromagnetic detection is a key issue in current research. The boundary detection method can delineate the horizontal position of geological bodies, and then guide the next step of interpretation work, and is widely used in the processing of aeromagnetic data. At present, there are many methods used in the detection and picking of geological structure boundaries. The position of the total horizontal derivative maximum value and vertical derivative zero value line of aeromagnetic anomaly correspond...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/00
CPCG01V3/00
Inventor 焦健周帅赵肖
Owner JILIN UNIV