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Gravity and gravity gradient modulus combined three-dimensional inversion method

A gravity gradient and gravity technology, applied in the field of gravity and gravity gradient modulus joint three-dimensional inversion, can solve the problems of increasing the complexity of inversion modeling, achieve improved convergence speed and accuracy, improve horizontal resolution, and improve inversion effect of performance

Active Publication Date: 2020-07-10
中国自然资源航空物探遥感中心
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Problems solved by technology

Compared with the gravity data, the gravity gradient modulus data has a higher horizontal resolution. However, the meaningful physical quantity obtained by the gravity gradient modulus inversion is the amplitude of the density difference. In the future, gravity data or prior geological data must be combined. The data further judges whether the density difference is positive or negative, which increases the complexity of inversion modeling to a certain extent

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  • Gravity and gravity gradient modulus combined three-dimensional inversion method
  • Gravity and gravity gradient modulus combined three-dimensional inversion method
  • Gravity and gravity gradient modulus combined three-dimensional inversion method

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Embodiment Construction

[0032] The flow of a combined three-dimensional inversion method of gravity and gravity gradient modulus is as follows: figure 1 shown. For describing the present invention in conjunction with embodiment, set up theoretical model, as figure 2 As shown in (a), the side length of the double cube model is 400m, the top buried depth is 200m, and the density difference is 1g / cm 3 、-1g / cm 3 . Ground gravity data generated by theoretical models such as figure 2 As shown in (b), there are 31×24=744 sampling points in total, and the sampling interval is 100m. For this model example, the present invention is described in detail.

[0033] 1. Perform potential field transformation on the observed gravity data g to obtain the gravity gradient modulus M, such as image 3 As shown in (b), the relationship between its element M and the gravity g of the corresponding position is:

[0034]

[0035] The theoretical gravity gradient modulus obtained by the model forward calculation is...

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Abstract

The invention discloses a gravity and gravity gradient modulus combined three-dimensional inversion method. Firstly, the gravity gradient modulus is obtained through potential field conversion, the gravity gradient modulus and the gravity data are added into inversion together, compared with single gravity inversion, the inversion resolution can be improved, and compared with single gravity gradient modulus inversion, whether the density difference is positive or negative does not need to be judged for the second time. Meanwhile, a horizontal weighting function is constructed by utilizing thegravity gradient modulus, the model is constrained, and the horizontal resolution is further improved. In the process of solving the optimal solution, gravity data and prior geological information areused for establishing an optimized initial search model, the convergence speed is increased and the inversion accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of gravity exploration, and relates to a combined three-dimensional inversion method of gravity and gravity gradient modulus. Background technique [0002] The three-dimensional physical property inversion technology of gravity data can provide information about the shape, scale, physical property size, and distribution characteristics of geological bodies, and can provide a clear and reliable reference for geological energy exploration. Therefore, the three-dimensional inversion technology of gravity data has always been a research hotspot question. Unlike the wave field, which can collect data of multiple frequencies at one observation point, the gravity field belongs to the potential field, and only one data can be collected at one observation point of the potential field. This feature determines that the amount of information contained in the observed gravity data is limited. Therefore, only using the g...

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Application Information

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IPC IPC(8): G01V7/06
CPCG01V7/06
Inventor 熊盛青高秀鹤于长春张迪硕
Owner 中国自然资源航空物探遥感中心
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