Geophysical near-surface three-dimensional velocity field research method and device

Abstract

The invention provides a method and device for researching a near-surface three-dimensional velocity field of physical geography. The method comprises the steps of obtaining geological information of a research area according to the areal geology of the research area and research content; establishing a three-dimensional geological element conceptual model according to collected data; determining the preliminary survey position of a near-surface survey and a near-surface preliminary survey scheme, carrying out construction according to the determined preliminary survey position of the near-surface survey and the determined near-surface preliminary survey scheme, and obtaining site construction data; adjusting the three-dimensional geological element conceptual model according to the obtained site construction data until the geological elements in the three-dimensional geological element conceptual model are adaptive to wave velocity; establishing a geology and speed field model with the surficial geology coordinated with wave velocity layers on the basis of the three-dimensional geological element conceptual model with the geological elements adaptive to the wave velocity. According to the method and device for researching the near-surface three-dimensional velocity field of physical geography, the technical problem that in the prior art, a near-surface velocity model is not accurate is solved, and the effect of effectively improving the accuracy of the near-surface velocity model is achieved.

Description

technical field [0001] The invention relates to the technical field of earth exploration, in particular to a research method and device for a geophysical near-surface three-dimensional velocity field. Background technique [0002] In land and shallow sea geophysical exploration problems, the subsurface velocity structure from the surface or seabed to a depth of 500 meters is generally more complicated, and the research on these problems is defined as "near surface problems". The so-called near surface refers to the geological structure above the bedrock below the surface, which is a loose sedimentary layer affected by changes in the natural environment. On the surface of the earth, it is often covered with a layer of unconsolidated and loose sedimentary layer, which is called Weathered Layer (Weathered Layer) in seismic exploration, that is, low-velocity layer (Low-veloeity Layer), sometimes in the low-velocity layer There is also a subweathered layer with a slightly higher...

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Problems solved by technology

[0006] The embodiment of the present invention provides a geophysical near-surface three-dimensional velocity field research method to solve the problem of inaccurate near-surface velocity models caused by considering only geophysical data conforming to the general situation of the research area in the prior art to establish near-surface velocity models. For less technical issues, the method includes:

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