Target depth estimation method and system based on gravity and magnetic gradient data tensor invariants

A technology of target depth and gravity gradient, applied in the field of gravity exploration, which can solve the problems of limited and easy noise interference, low depth resolution of potential field data, magnetic dip and magnetic declination, large depth estimation error, etc.

Active Publication Date: 2020-05-08
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the research, the inventors found that the calculation of the depth position of the geological target is the key problem in the interpretation of the gravity and magnetic data, while the potential field data has the characteristics of low depth resolution and is easily affected by the magnetic dip and declination, and the depth estimation error If the two-dimensional profile data is used for processing and interpretation, it has limitations and is easily affected by noise interference; while the gravity anomaly or vertical gravity anomaly data is usually used for processing and interpretation, the amount of information is small , low data utilization

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  • Target depth estimation method and system based on gravity and magnetic gradient data tensor invariants
  • Target depth estimation method and system based on gravity and magnetic gradient data tensor invariants
  • Target depth estimation method and system based on gravity and magnetic gradient data tensor invariants

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Embodiment 1

[0078] This embodiment discloses a target depth estimation method based on gravity-magnetic gradient data tensor invariant.

[0079] See attached Figure 4 It is a schematic flow diagram of the disclosed method, comprising the following steps:

[0080] Step (1): According to the gravity gradient tensor data of the spherical model object, calculate the eigenvalue of its gradient matrix and the tensor invariant of the combination of eigenvalues;

[0081] Step (2): Using the arc tangent of the ratio of the tensor invariant to the total horizontal derivative, establish the relationship between the horizontal distance and the buried depth.

[0082] Step (3): Estimate the target depth through the distance between the two 45° contours on the arctangent ratio map.

[0083] In described step (1), specific content includes:

[0084] (1-1) The gravity field is the vector component of the gravitational potential in the x, y, and z directions of the Cartesian coordinate system, and the ...

Embodiment 2

[0155] The purpose of this embodiment is to provide a computing device, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the program, the following steps are implemented, including:

[0156] Step (1): According to the gravity gradient tensor data of the spherical model object, calculate the eigenvalue of its gradient matrix and the tensor invariant of the combination of eigenvalues;

[0157] Step (2): Using the arc tangent of the ratio of the tensor invariant to the total horizontal derivative, establish the relationship between the horizontal distance and the buried depth.

[0158] Step (3): Estimate the target depth through the distance between the two 45° contours on the arctangent ratio map.

Embodiment 3

[0160] The purpose of this embodiment is to provide a computer-readable storage medium.

[0161] A computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the following steps are performed:

[0162] Step (1): According to the gravity gradient tensor data of the spherical model object, calculate the eigenvalue of its gradient matrix and the tensor invariant of the combination of eigenvalues;

[0163] Step (2): Using the arc tangent of the ratio of the tensor invariant to the total horizontal derivative, establish the relationship between the horizontal distance and the buried depth.

[0164] Step (3): Estimate the target depth through the distance between the two 45° contours on the arctangent ratio map.

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Abstract

The invention provides a target depth estimation method and system based on gravity and magnetic gradient data tensor invariants. According to a gravity gradient tensor plane data graph of a sphere model object, calculating a characteristic value of a gradient matrix and a tensor invariant of the characteristic value combination; establishing a relationship between a horizontal distance and a burial depth through arc tangent operation by utilizing the tensor invariant and a total horizontal derivative; and estimating the depth of the target body according to a distance between two 45-degree isolines. According to the method, a depth estimation problem under the condition of a single geologic body or a plurality of geologic bodies with relatively long distances is solved and a relatively high-precision calculation result can be obtained.

Description

technical field [0001] The invention belongs to the field of gravity exploration, in particular to a target depth estimation method and system based on gravity and magnetic gradient data tensor invariants. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Gravity prospecting was originally a gravity measurement method used to study the shape of the earth. It is the earliest method used by humans to study the earth. Today, gravity prospecting is still an important branch of geophysical prospecting. Its purpose is to measure the uneven distribution of density underground. Gravity or gravity gradient anomalies caused by the difference of gravity and gravity are used to study and infer the space and density distribution attributes of underground geological bodies, so as to better understand underground space and serve human society. Gravity ex...

Claims

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Application Information

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IPC IPC(8): G01V7/00
CPCG01V7/00
Inventor 丁然田招招薛瑞
Owner SHANDONG UNIV
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