Method and device for gravity-earthquake joint inversion

Abstract

The invention discloses a method and device for gravity-earthquake joint inversion. The method comprises the following steps: obtaining gravity data, seismic observation data and physical property statistical data of a study area; establish an initial model of density and velocity of the study area; establishing a new structure coupling method and constructing an objective function of gravity-earthquake joint inversion; optimizing and solving the objective function so as to obtain the density and velocity distribution in the study area; and performing image drawing. The device comprises a datacollector, a processor, a display and an input device. A data acquisition module is arranged in the data collector. The processor is therein provided with a data calculation module and a data analysis module. The display is therein provided with a data interpretation module and a data mapping module. Input devices are used to enter data and parameters. The invention overcomes the influence of human factors such as the empirical relationship between density and speed, and is reliable in data acquisition, strong in applicability, high in speed, high in efficiency and good in economical performance.

Description

technical field [0001] The invention relates to a method and a device, in particular to a method and a device for combined seismic inversion. Background technique [0002] The multiple solutions of geophysical inversion and the limitation of single geophysical method to solve problems make the comprehensive geophysical research have obvious importance and advantages. Among them, joint inversion is an important quantitative interpretation tool for comprehensive geophysical research. Joint inversion is to use multiple geophysical observation data to obtain the same subsurface geological and geophysical model through the relationship between petrophysical and geometric parameters of geological bodies. Since there is only one geophysical model to be inferred, the various geophysical fields produced by it should be consistent with the various geophysical data observed on the surface, so as to improve the non-uniqueness of the inversion. Therefore, the long-term joint inversion I...

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Problems solved by technology

[0003] However, complex surface conditions and complex underground structures make the current exploration targets faced by geophysics more complex and difficult. The inversion results obtained by existing geophysical methods are based on certain petrophysical parameters from a certain angle To understand geological and geophysical problems, only one geophysical method to solve the problem shows limitations, and other methods must be supplemented, and the existing joint inversion has not been able to establish a reasonable coupling mechanism and fail to reduce the inverse problem. Multi-solution, with limitations, instability and many defects

In addition, the existing joint inversion is highly dependent on human factors, the reliability of the obtained data is poor, and the applicability to complex geological structural conditions is also poor, and it cannot obtain broad market prospects and good promotion and use value

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