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
View PDF0 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 qua...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for improving image quality of seismic data
  • Method for improving image quality of seismic data
  • Method for improving image quality of seismic data

Examples

Experimental program
Comparison scheme
Effect test

specific example

[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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap