Potential field data geological structure position delineating method based on gradient tensor characteristic values
A gradient tensor, geological structure technology, applied in geophysical measurement, instruments, etc., can solve the problems of false boundary position and low precision, and achieve the effect of avoiding false boundary position, high spatial resolution and precision, and improving precision
Active Publication Date: 2021-02-05
JILIN UNIV
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Now there are a lot of literature and work on the delineation method of geological structure position. Under certain assumptions, a good horizontal position delineation effect of geological structure is obtained, but false boundary positions will be generated in the processing of multi-geological body space superposition anomalies , low precision and other issues
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[0045] Taking the measured potential field anomaly data in a certain area in Jilin as an example, the spatial distribution of fault structures is determined by the method of delineating the geological structure position of the potential field data based on the gradient tensor eigenvalues. Among them, figure 2 An anomaly map of the measured potential field data in this area.
[0046] Specific steps are as follows:
[0047] S1: Obtain the measured potential field data in this area, use the anomaly stripping method based on upward continuation to realize the anomaly separation of the regional field and the local field, and use the space domain-frequency domain derivative calculation method and the Laplace equation to calculate the gradient component G xx , G xy , G xz , G yx , G yy , G yz , G zx , G zy , G zz ;
[0048] S2: Using the gradient component to establish a gradient tensor matrix G, wherein the gradient tensor matrix G is as shown in formula (1):
[0049]
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The invention discloses a potential field data geological structure position delineating method based on gradient tensor characteristic values. The method comprises the following steps of S1, acquiring actually measured potential field data, and realizing abnormal separation of a regional field and a local field by adopting an abnormal stripping method based on upward continuation, calculating a gradient component by adopting a spatial domain-frequency domain derivative calculation method and a Laplace equation; S2, establishing a gradient tensor matrix by utilizing the gradient components; S3, calculating the characteristic values of the gradient tensor matrix; and S4, defining a geological structure position delineation method by utilizing the characteristic values. The potential field data geologic structure position delineation method based on the gradient tensor characteristic values has higher horizontal resolution; a delineated fracture structure is clearer; boundary positions corresponding to the deep and shallow geologic structures can be effectively delineated, and the geologic structure interpretation precision is improved.
Description
technical field [0001] The invention relates to the field of earth science technology, and in particular provides a method for delineating geological structure positions based on gradient tensor eigenvalues of potential field data. Background technique [0002] Potential field data has a higher horizontal resolution than other geophysical measurement data, and has been widely used in the division of geological structures in marine and land regions, providing an important means for delineating regional structural positions and identifying faults. Establishing a high-precision geological structure position delineation method based on potential field data can better serve the exploration of marine and land resources, and further guide the fine exploration and interpretation of other geophysical methods. Now there are a lot of literature and work on the delineation method of geological structure position. Under certain assumptions, a good horizontal position delineation effect...
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IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 周帅高妍荣骏召王利杰焦健管彦武
Owner JILIN UNIV