Method and device for calculating gradient tensor of magnetic field in two-dimensional body well,equipment and medium

Abstract

The invention discloses a method and a device for calculating the gradient tensor of the magnetic field in a two-dimensional body well, equipment and a medium. A rectangular model internally containing a target area is constructed, the gradient tensor of the magnetic field in the well generated by each column of small rectangular units at an observation point in the well is calculated by adopting a one-dimensional discrete convolution method, and the in-well magnetic field gradient tensor components generated at the in-well observation point of each column of small rectangular units in the rectangular model are respectively accumulated to obtain the in-well magnetic field gradient tensor generated at the in-well observation point of the whole rectangular model. A special magnetic field gradient tensor weighting coefficient calculation method is provided, a one-dimensional discrete convolution rapid calculation method is combined and adopted, and unification of calculation precision and calculation efficiency of the magnetic field gradient tensor in the two-dimensional body well is achieved.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional magnetic field numerical simulation, and in particular relates to a method, device, equipment and medium for calculating the magnetic field gradient tensor in a two-dimensional well. Background technique [0002] Compared with ground and airborne magnetic prospecting, borehole magnetic prospecting is closer to the field source body and can better reflect information such as the location of the field source body. The magnetic field gradient in wells is more sensitive to the magnetic susceptibility and shape changes of the source body, and is an important observation method in the field of solid minerals. With the development of magnetic observation equipment in wells, magnetic field measurement in wells has gradually become an important exploration method. In order to meet the requirements of joint inversion of surface-well magnetic field gradient tensor data, efficient calculation of well ...

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Problems solved by technology

[0005] Aiming at the problem of low calculation accuracy of the current calculation method of the magnetic field gradient tensor in the two-dimensional body well, and at the same time considering the requirements for calculation efficiency of joint surface-in-well magnetic field data inversion imaging, human-computer interaction modeling and interpretation, the present invention proposes Calculation method, device, equipment and medium of magnetic field gradient tensor in two-dimensional well, which can be adapted to fast and high-precision calculation of magnetic field gradient tensor in two-dimensional well with arbitrary cross-sectional shape and arbitrary magnetic susceptibility distribution

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