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Gravity data and gravity gradient data combined regularized inversion method

A technology of gravity gradient and gravity data, applied in the direction of measuring gravitational field, measuring devices, instruments, etc., can solve the problem of low vertical resolution of inversion results, achieve the effect of clear bottom boundary and improve resolution

Active Publication Date: 2019-11-01
GUANGZHOU MARINE GEOLOGICAL SURVEY
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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a joint regularized inversion method of gravity data and gravity gradient data, which can solve the problem of low vertical resolution of the inversion results in the joint inversion of gravity data and gravity gradient data. question

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  • Gravity data and gravity gradient data combined regularized inversion method
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  • Gravity data and gravity gradient data combined regularized inversion method

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[0037] specific implementation plan

[0038] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:

[0039] like Figure 1 to Figure 3 As shown, a joint regularization inversion method of gravity data and gravity gradient data includes the following steps:

[0040] Step 1: Obtain gravity data, perform inversion calculation on gravity data, and its objective function φ d Such as formula (1), that is, gravity data inversion is calculated according to formula (1):

[0041]

[0042] in, Represents the square operation of the two-norm, d represents the observed data, which is a vector with a size of n 1 ×1,n 1 Represents the number of observation points, A represents the sensitivity matrix, which can be obtained by using the existing general calculation formula, and its size is n 1 ×n 2 , n 2 Indicates the number of small cuboids for the division of the survey area, A ij is the element in A, representing th...

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Abstract

The invention relates to a gravity data and gravity gradient data combined regularized inversion method. The method comprises the steps that 1, gravity data is acquired, inversion calculation is performed on the gravity data, and an inversion result is obtained; 2, the absolute value of the inversion result m obtained in the step 1 is acquired and normalized, a zero value in the result is set as aminimal value, and the processed result is used as a weighted matrix; and 3, gravity gradient data is acquired, the gravity gradient data and the weighted matrix are simultaneously applied to inversion calculation, and an inversion result of combined inversion of the gravity gradient data and the weighted matrix is obtained. Through the method, geological information contained in the gravity datais effectively utilized, the gravity data is utilized to construct the weighted matrix, the weighted matrix is applied to the gravity gradient inversion calculation, the resolution of the inversion result is increased, and the bottom border of the inversion result is clearer and more accurate.

Description

technical field [0001] The invention relates to the technical field of potential field data inversion methods, in particular to a joint regularization inversion method for gravity data and gravity gradient data. Background technique [0002] The gravity data is obtained by measuring the vertical component of the potential field, and the gravity gradient data is obtained by measuring the changes of the gravity field in three directions. Taking the Cartesian coordinate system as an example, the vertical downward is represented by the positive direction of the Z axis. Gravity The data is the first-order partial derivative of the gravity field in the Z-axis direction, and the gravity gradient data is the second-order partial derivative of the gravity field in the X, Y, and Z-axis directions. Comparing the gravity data and the gravity gradient data in the frequency domain, it can be found that the gravity data contains more low-frequency information, while the gravity gradient da...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/06
CPCG01V7/06
Inventor 秦朋波张向宇李建平
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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