Chromatography static correction processing method and device

Abstract

The embodiment of the invention discloses a chromatography static correction processing method and device; the method comprises the following steps: inverting the nerve network of an initial velocitymodel so as to obtain the first near-surface velocity model; ray tracking the first near-surface velocity model according to small grid units, and calculating the ray degree of covering of the small grid units; discretizing the first near-surface velocity model on the basis of variable-grid unit according to the small grid unit ray degree of covering, wherein the difference value between the ray degrees of covering of two random grid units in the first near-surface velocity model after the variable-grid unit discretization is smaller than the first threshold; inverting the nerve network of thefirst near-surface velocity model after the variable-grid unit discretization, thus obtaining the second near-surface velocity model; determining the static correction amount according to the secondnear-surface velocity model. Various embodiments of the invention can improve the chromatography static correction processing precision and stability.

Description

technical field [0001] The invention relates to the technical field of seismic signal processing, in particular to a processing method and device for tomographic static correction. Background technique [0002] Foreland basins in central and western China are rich in oil and gas resources and are key areas for oil and gas exploration and development. Exploration practice shows that accurate seismic imaging is the key means to reduce exploration risks in these areas. However, the surface elevation fluctuations in these areas are large, the velocity and thickness of the low-velocity zone vary sharply in space, the refraction interface is unstable, and the complex near-surface structure leads to The problem of static correction is extremely prominent, and the problem of static correction has become a major bottleneck restricting the accurate imaging of subsurface structures in these areas. [0003] At present, a variety of static correction methods have been applied to the out...

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Problems solved by technology

[0004] However, due to the extremely complex near-surface structure of complex mountains, the drastic vertical and horizontal changes in the velocity and thickness of the low-velocity zone lead to ill-conditioned and multi-solution problems in the near-surface velocity inversion of tomographic static correction. The accuracy of correction is difficult to meet the needs of actual seismic exploration

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