Fidelity frequency-raising method for high-coverage pre-stack seismic data

A technology of coverage times and seismic data, applied in the field of seismic exploration, can solve the problems of reduced apparent resolution and low signal-to-noise ratio of stacked sections, and achieve the effect of meeting the requirements of pre-stack inversion, improving resolution, and improving comprehensive quality

Active Publication Date: 2021-01-12
PETROCHINA CO LTD +1
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a fidelity frequency-raising method for high-coverage pre-stack seismic data to overcome the signal-to-noise ratio of pre-stack CRP gathers in the prior art Low, the AVO characteristics of the gather will be changed after the amplitude compensation equalization, and the apparent resolution of the stacked section will be reduced after the frequency band is widened.

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
  • Fidelity frequency-raising method for high-coverage pre-stack seismic data
  • Fidelity frequency-raising method for high-coverage pre-stack seismic data
  • Fidelity frequency-raising method for high-coverage pre-stack seismic data

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045]The present invention will be described in detail below with reference to the drawings and embodiments.

[0046]Such asfigure 1 As shown, the embodiment of the present invention provides a fidelity frequency raising method for high-coverage pre-stack seismic data, including:

[0047]Step S1. Method applicability analysis: Determine the maximum coverage times of CMP gathers at the target layer and the maximum coverage times of CRP gathers by analyzing the types of acquisition and observation systems that apply the target data, combined with the offset grouping scheme during offset processing, The invention has strong applicability and low data requirements, but it has better data effects for CMP gather coverage times greater than or equal to 200 times, and CRP gather coverage times greater than or equal to 60 times. (High coverage times can ensure post-stack data signal noise ratio).

[0048]Step S2: Eliminate the remaining time difference on the CRP gather: the method based on amplitude a

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 the technical field of seismic exploration, in particular to a fidelity frequency-increasing method for high-coverage pre-stack seismic data. The method comprises the following steps that applicability judgment is conducted on seismic data pre-stack gather data to be processed, and if conditions are met, residual time difference elimination is conducted on a pre-stack CRPgather; random noise suppression processing based on prediction errors is carried out on the pre-stack CRP gather with the residual time difference eliminated; stability inverse Q filtering processingis performed based on time-frequency analysis; weighted least square Radon transform denoising processing is carried out; time-varying pulse deconvolution processing is carried out; and denoising andcoherent superposition processing are carried out. According to the fidelity frequency increasing method for the pre-stack seismic data with the high coverage frequency, the signal-to-noise ratio ofhigh-frequency components of the pre-stack CRP gather can be effectively improved. The resolution ratio is greatly improved, meanwhile, the transverse resolution ratio is not lost, the comprehensive quality of the CRP gather is improved, and the requirement for prestack inversion can be met.

Description

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

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
Owner PETROCHINA CO LTD
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