Aeromagnetic data geologic body boundary identification method based on three-dimensional structure tensor
A boundary identification and three-dimensional structure technology, applied in the direction of surveying devices, electric/magnetic exploration, geophysical surveying, etc., can solve the problems of poor resolution and low precision in boundary identification, and achieve the goal of avoiding interference information, high resolution and The effect of precision
Active Publication Date: 2020-04-14
JILIN UNIV
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[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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[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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The invention relates to an aeromagnetic data geologic body boundary identification method based on a three-dimensional structure tensor. The method comprises the steps of obtaining and preprocessingactually measured aeromagnetic abnormal data; performing spatial domain calculation on the preprocessed data; performing frequency domain calculation on the preprocessed data; and utilizing the data calculated in the spatial domain and the data calculated in the frequency domain to obtain a horizontal derivative and a multi-order vertical guide number and construct a tensor matrix to further obtain a boundary identification filter NSED1 and a boundary identification filter NSED2. According to the invention, the thought that a conventional boundary identification filter adopts a single gradientand the same gradient to define the filter is broken through; and the defined boundary identification filter with participation of the multiple gradient components can obtain clearer and more reliable geologic body horizontal position delineation results under complex geological conditions such as deep and shallow superposition abnormality, close superposition abnormality and positive and negative superposition abnormality. Interference information generated by abnormal superposition is avoided, and the boundary position enhancement and extraction capacity of geologic bodies corresponding toweak anomalies and deep anomalies is improved.
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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CPCG01V3/00
Inventor 焦健周帅赵肖
Owner JILIN UNIV