Rapid and high-precision forward modeling method for gravitational field of arbitrary density distribution complex geological body

A technology of density distribution and complex geology, applied in high-precision forward modeling, in the field of rapid gravity field of complex geology with arbitrary density distribution, it can solve the problem of human-computer interaction modeling and interpretation that cannot meet the requirements of large-scale gravity 3D density inversion, and cannot be guaranteed at the same time. Problems such as computational efficiency and computational accuracy

Active Publication Date: 2016-02-17
CENT SOUTH UNIV
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Problems solved by technology

[0007] Aiming at the problem that the existing gravity field forward modeling method cannot guarantee the calculation efficiency and calculation accuracy at the same time, and cannot meet the needs of large-scale gravity three-d

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  • Rapid and high-precision forward modeling method for gravitational field of arbitrary density distribution complex geological body
  • Rapid and high-precision forward modeling method for gravitational field of arbitrary density distribution complex geological body
  • Rapid and high-precision forward modeling method for gravitational field of arbitrary density distribution complex geological body

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Embodiment Construction

[0063] The method in the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0064] 1. Representation of complex geological model:

[0065] First, establish a regular prism model containing all target areas, and determine the starting position of the prism in the x, y, and z directions, so that the target area (including the undulating terrain) is completely embedded in the prism model;

[0066] Secondly, divide the prism into many regular small prisms (such as figure 2 Shown), determine the geometric dimensions of the small prism Δx, Δy, Δz;

[0067] Finally, according to the density distribution of the target area, assign a value to the density of each small prism. The density of the small prism in the air part is set to zero;

[0068] 2. Gravity field calculation of prism combined model:

[0069] The prism composite model given in step 1, its gravity field calculation formula is

[0070] g z ( x m , y n ...

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Abstract

The invention discloses a rapid and high-precision forward modeling method for a gravitational field of an arbitrary density distribution complex geological body. The rapid and high-precision forward modeling method achieves the unification of efficiency and precision of gravitational field forward modeling through the steps of complex geological body model representation and prism body combined model gravitational field calculation (including weighted coefficient calculation, two-dimensional discrete convolution calculation and gravitational field value synthesis). The rapid and high-precision forward modeling method solves the problems that the existing gravitational field forward modeling method cannot guarantee calculation efficiency and calculation precision simultaneously, and cannot meet the requirements of large-scale gravitational field three-dimensional density inversion and man-machine interaction modeling and interpretation.

Description

Technical field: [0001] The invention relates to a forward modeling method for a gravity field, in particular to a fast and high-precision forward modeling method for the gravity force field of a complex geological gravity field with arbitrary density distribution. Background technique: [0002] The forward modeling of the gravity field refers to calculating the gravity field based on the density distribution, and the inversion refers to calculating the density distribution based on the observed gravity value. Forward modeling is the basis of inversion. The efficiency of forward calculation directly affects the efficiency of inversion calculation, and the accuracy of forward calculation directly affects the quality of inversion results. In the field of gravity exploration, with the development of surveying and mapping technology and instruments, gravity measurement has significantly improved its measurement accuracy, spatial resolution and measurement range, providing large-scale...

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Application Information

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IPC IPC(8): G01V7/00
CPCG01V7/00
Inventor 陈龙伟张钱江戴世坤吴美平
Owner CENT SOUTH UNIV
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