Seismic data static correction method and device for earth surface high-speed coverage area

Abstract

The invention provides a seismic data static correction method and device for an earth surface high-speed coverage area. The method comprises the steps of obtaining a resistivity value of a to-be-measured point based on a pre-obtained resistivity profile of a target earth surface high-speed coverage area, and inputting the resistivity value into a pre-obtained earth surface igneous rock model to obtain the actual thickness of the igneous rock layer corresponding to the to-be-measured point; performing high-speed correction on the seismic data corresponding to the igneous rock layer of the to-be-measured point by applying the actual thickness of the igneous rock layer and the pre-obtained igneous rock speed; and according to the horizontal position coordinates of the to-be-measured point, obtaining a static correction value of a corresponding underlying low-speed-reduction layer from a pre-obtained near-surface structure model so as to realize low-speed correction of seismic data corresponding to the underlying low-speed-reduction layer of the to-be-measured point. The method can achieve the simultaneous correction of an earth surface high-speed belt and an underlying low-speed-reduction belt, and improves the imaging quality of seismic data.

Description

technical field [0001] The present application relates to the field of petroleum seismic data processing, in particular to a static correction method and device for seismic data in areas covered by high-speed surfaces. Background technique [0002] In the process of seismic data processing, the static correction technology is to eliminate the impact on the travel time of seismic waves due to surface undulations and lateral changes in the thickness and velocity of the surface low-velocity zone, and to correct the seismic data to a unified datum, so that the seismic data can meet the requirements of seismic exploration. Theoretical assumptions of data processing. [0003] The static correction technology can be generally divided into three types according to the different devices used to obtain the near-surface velocity model: model static correction method, refraction static correction method and first-arrival tomographic static correction method. Among them, model static co...

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Problems solved by technology

[0004] The above static correction devices can achieve better results for areas with normal sedimentary characteristics on the surface. good static correction

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