Model method static correction method for surface survey data

Abstract

The invention provides a model method static correction method for surface survey data and a model method static correction device for surface survey data. The method comprises the following steps of loading two-dimensional or three-dimensional surface survey data; executing unified processing on the loaded surface survey data, wherein the unified layering is carried out according to the time depth change trends, and the speed and thickness parameters of each control point on each layer are calculated; building a two-dimensional or three-dimensional near-surface model on the basis of surface survey data subjected to the unified processing; executing intersection model closing on the built three-dimensional near-surface model by adopting a two-way mean value interpolation method, or eliminating the model distortion of the three-dimensional near-surface model by adopting a center region smooth method; and building speed and thickness models of each two-dimensional or three-dimensional near-surface layer through time depth curve relevance operation, and calculating the model method static correction quantity of the surface layer survey data.

Description

technical field [0001] This application relates to a method and device for model-based static correction based on surface survey data, in particular to a unified data platform based on different types of surface survey data, and the establishment and optimization of near-surface models based on unified surface survey data , a technique for performing static correction processing on complex surface survey data. Background technique [0002] The theories of geometric seismology all assume that the observation surface is a horizontal plane and the underground propagation medium is uniform, but this is not the case in reality. The observation plane is not a horizontal plane, it is usually undulating, and the underground propagation medium is usually not uniform, and there are also lateral changes of low-velocity zones on the surface. Therefore, the arrival time of the reflected wave obtained by field observation does not satisfy the hyperbolic equation, but a distorted hyperbol...

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Problems solved by technology

[0007] The above technologies can all be attributed to one-time static correction technology. Height static correction technology cannot solve mountainous exploration. The surface of mountainous exploration areas has great fluctuations. The difference between the base level and the height difference will inevitably increase. In addition, most of the data are collected in long arrays. The larger the offset, the larger the incident angle of the ray, and the approximately equal travel time of the high-level static correction cannot be satisfied; the refraction static correction requires a set of stable refraction underground. In many mountainous terrains, the scope of application of refraction static correction is limited; tomographic static correction uses the first-arrival wave to invert the surface low-velocity zone with continuous longitudinal and lateral changes, avoiding the The assumption of layered velocity structure is more suitable for the establishment of surface velocity models in various complex near-surface conditions, including mountains, and has stronger adaptability. Inaccurate picking has a great influence on the accuracy of tomographic static correction

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