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Method for improving image quality of seismic data

A technology of imaging quality and seismic data, applied in the field of geophysical exploration, can solve the problems of affecting the quality of superimposed sections, increasing the amount of calculation, over-calibration, etc., and achieve the effect of solving the problem of large offset

Active Publication Date: 2009-12-09
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0003] At small offsets, this approximation error is small, but at large offsets, the hyperbolic approximation produces a non-negligible error
When the offset is very large, when the hyperbola is used to correct the travel, there will be an over-correction phenomenon, and the superposition of the CMP gathers after this dynamic correction will seriously affect the quality of the stacked section obtained. Currently, the commonly used solution The solution is to cut off, but cutting off will lose the cannon offset information
In order to solve this problem, it was proposed to increase the scanning parameters of the velocity analysis to improve the accuracy of the time-distance curve, which will greatly increase the amount of calculation

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  • Method for improving image quality of seismic data
  • Method for improving image quality of seismic data
  • Method for improving image quality of seismic data

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[0051] 1) Obtain pre-stack CMP gather seismic records.

[0052] 2) Perform velocity analysis on this CMP gather using formula (1) with a correction term.

[0053] figure 1 (b) is the effect of this embodiment, obviously better than figure 1 (a) The effect of the conventional velocity spectrum, where the energy clusters are relatively concentrated.

[0054] Usually, to check the effect of motion correction, in addition to the velocity spectrum, motion correction should be performed on the CMP gathers to observe different t 0 Whether the reflected wave is leveled.

[0055]3) Using the (t, v) pair obtained from velocity analysis, apply formula (1) to perform motion correction.

[0056] figure 2 It is the effect comparison after dynamic correction of the actual CMP gather seismic records. figure 2 (a) is the result of routine motion correction. figure 2 (b) is the result of motion correction using the hyperbolic formula (1) with a correction term. It can be seen that the...

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Abstract

The invention relates to a method for improving the imaging quality of seismic data. The method comprises the following steps: acquiring pre-stacking CMP gather seismic record through seismic collection; analyzing the velocity of the CMP gather; picking up optimum TV pairs in a velocity spectrum, carrying out interpolation to obtain all corresponding velocity and making dynamic correction; stacking the CMP gathers after the dynamic correction; and obtaining a post-stacking seismic section with higher imaging quality. The invention provides time plot calculation suitable for the velocity analysis and dynamic correction of an observation system with a large shot-geophone distance, and solves the problem of large shot-geophone distance without increasing the amount of calculation basically.

Description

technical field [0001] The invention relates to geophysical exploration technology, belongs to the technical category of solving the problems of velocity analysis and dynamic correction of large offset distances in the process of seismic data processing, and is a method for improving the imaging quality of seismic data. Background technique [0002] In seismic data processing, it is usually assumed that the subsurface is a horizontal layered medium. According to the Snell principle of ray theory, the derived time-distance (travel time and offset) curve is not a strict hyperbola, but a hyperbola an approximation. Conventional velocity analysis and motion correction both use hyperbola as the time-distance curve of seismic wave propagation. [0003] At small offsets, this approximation error is very small, but at large offsets, the hyperbolic approximation produces non-negligible errors. When the offset is very large, when the hyperbola is used to correct the travel, there wi...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30G01V1/36
Inventor 周兴元李合群任晓乔
Owner BC P INC CHINA NAT PETROLEUM CORP
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