Method for processing refraction static correction border

Abstract

The invention relates to a method for processing a refraction static correction border of petroleum geophysical exploration data. The method comprises the following processes: taking the first arrival time of a shot of seisline containing space delay time near the border to fit a straight line to obtain a time difference from a demodulator probe to the fitted straight line; and obtaining a translation amount according to the existent delay time and difference of a series of time differences of the demodulator probe: translating the time differences of the demodulator probe to obtain the absolute delay time of the border of the demodulator probe, then calculating the thickness of a low-deceleration zone according to the delay time, and calculating the static correction amount of a reference plane and applying the static correction amount to a stacking section. The invention complements the delay time of the border area, builds a near-surface model, carries out static correction calculation and eliminates the influence of border problems; in addition, the effect of the stacking section obtained after the static correction amount in the border position is remarkably improved.

Description

technical field [0001] The present invention relates to petroleum geophysical prospecting data processing technology, which is a refraction static correction for determining the static correction amount by using the refraction first-arrival time of the shot point near the boundary to obtain the delay of the detection point of the boundary part to obtain the thickness of the low-velocity zone The method of boundary processing. Background technique [0002] In petroleum geophysical exploration, static correction is an essential part of data processing, especially for complex surface areas. Static correction of refracted waves is based on the first arrival time of refracted waves from the high-speed layer, and when the delay of the shot-check point is obtained, the thickness of the low-velocity-slow zone is obtained to calculate the amount of static correction. The refraction static correction processing method is stable and effective, and is currently the most widely used sta...

AI Technical Summary

Problems solved by technology

However, the interpolation is based on the trend of the data around the boundary, which is obtained by expanding outward. It is a mathematical algorithm. The interpolation results are often inconsistent with the actual results. When the change of the near-surface model boundary does not conform to the change law of mathematical calculations, There will be relatively large errors between the interpolated results and the actual model, resulting in errors in static corrections

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