Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Wavelet packet conversion based frequency spectrum imaging method

A technology of wavelet packet transform and imaging method, which is applied in seismic signal processing and other directions, and can solve the problem of rough frequency division by wavelet transform

Active Publication Date: 2017-12-26
CHINA PETROLEUM & CHEM CORP +1
View PDF2 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a spectrum imaging method based on wavelet packet transform to solve the problems of fixed time window of short-time window Fourier transform and rough division of frequency by wavelet transform in view of the defects in the prior art. question

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
  • Wavelet packet conversion based frequency spectrum imaging method
  • Wavelet packet conversion based frequency spectrum imaging method
  • Wavelet packet conversion based frequency spectrum imaging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0086] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0087] Such as figure 1 As shown, the spectrum imaging method based on wavelet packet transform in the embodiment of the present invention mainly includes the following steps:

[0088] S1: Perform encrypted wavelet packet transform sorted by frequency band on the migrated 3D seismic data volume;

[0089] Define the conjugate filter bank h n and g n ,Satisfy:

[0090]

[0091]

[0092] g k =(-1) k h 1-k (3)

[0093] Among them, n,k,l∈Z,

[0094] Discrete Seismic Signals k The encryption tower decomposition algorithm sorted by frequency band under the wavelet packet base is:

[0095] If n is even, then

...

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 discloses a wavelet packet conversion based frequency spectrum imaging method. The method includes steps of performing encrypted wavelet packet conversion on a three-dimensional seismic data volume subjected to offset and dissolving seismic record into frequency-dividing seismic record ranked according to frequency band size from small to large; calculating five three-dimensional attribute data volume including frequency-dividing instantaneous amplitude spectrum, frequency-dividing instantaneous phase spectrum, instantaneous average frequency, instantaneous bandwidth and instantaneous absorption coefficient according to the wavelet packet conversion result; performing attribute slicing under the control of a seismic interpretation layer. According to the invention, influence on seismic wavelet spectrum estimation due to reflection coefficients is eliminated through a complex cepstrum technology, so that the instantaneous absorption coefficient estimated on said basis is more reasonable. A target is made prominent by utilizing a specific effect of color mixing in integrated display of three different frequency attributes and the target distinguishing effect of single frequency can be improved effectively.

Description

technical field [0001] The invention relates to oil exploration and development technology, in particular to a spectrum imaging method based on wavelet packet transform. Background technique [0002] According to the principle of thin layer tuning, the amplitude information of different frequencies reflects the tuning characteristics of strata with different thicknesses, so seismic records are essentially the superposition of information of different stratum thicknesses, that is, the comprehensive reflection of different geological bodies. For subtle oil and gas reservoirs such as thin sand layers, channels, and sand bars, it is difficult to clearly identify them on the seismic data volume due to the interference of other geological body information. The frequency components with better layer response are used for imaging, which is beneficial to the identification of target geological bodies. [0003] The technical core of spectrum imaging technology is time-frequency analy...

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): G01V1/30
CPCG01V1/30
Inventor 周开明刘贤红陈鹏
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com