A pde-based equivalent source continuation and data type conversion method for gravity field data

Abstract

The present invention provides a PDE-based gravity field data equivalent source continuation and data type conversion method, including: input gravity data, establish terrain undulation surface; grid subdivision, and carry out continuous structured non-uniform grid subdivision to determine the equivalent source inversion grid space; according to the gravity background field, the gravity field data is carried out based on the equivalent source inversion grid space. The PDE three-dimensional inversion calculation of the depth regularization factor, the positive value constraint term, and the regularization term obtains a multi-layer equivalent source model; given different observation parameters, the three-dimensional forward calculation of the gravity field of the nonlinear PDE is obtained by using the model One or more of gravity anomaly plumb data, gravity anomaly field data, and gravity gradient tensor data. The beneficial effect of the invention is that the self-adaptive, high-precision continuation and data type conversion calculation can be performed on underground gravity anomaly data in complex environments.

Description

technical field [0001] The invention relates to the technical field of geophysical surveying, in particular to a method for equivalent source extension and data type conversion of gravity field data based on PDE. Background technique [0002] In gravity detection, people usually detect the vertical first derivative of the gravity field, but in actual data interpretation, it is often necessary to convert these data into required parameters and types, such as different observation heights (continuation), The conversion of gradient tensor data, etc., the main challenge of gravity field data type conversion lies in the undulating measurement surface of aerial survey and the irregular measurement position of data (non-grid measurement), traditional data type conversion and continuation calculation are difficult to process these data , while using traditional single-layer, double-layer, and three-layer equivalent source data conversion methods, the accuracy of the processing resul...

AI Technical Summary

Problems solved by technology

[0007] The application of these technologies enables people to perform polarization and data type conversion operations of ground gravity data through equivalent source technology, but there are the following problems: 1) The equivalent source grid can only be constructed with a maximum of three layers, and the grid division discontinuous, the existing technology has limited layers of equivalent sources and unreasonable grid division of underground space, which affects the accuracy and speed of gravity field continuation and data type conversion; 2) each equivalent source needs to be separately estimating the depth position of the layer, and then placing it separately; 3) Using the linear forward modeling method and the linear model inversion method to calculate the equivalent source, the anti-interference ability and calculation accuracy are poor

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