High-precision pickup method of first arrival of microseism

A micro-seismic, high-precision technology, applied in the direction of seismic signal processing, etc., can solve the problems of weak useful signals, multiple types of seismic phases, and difficult to distinguish seismic signals, etc., and achieve the effect of strong adaptability and reliable results

Inactive Publication Date: 2014-06-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF0 Cites 40 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has its drawbacks: due to the influence of short time windows, the first arrival cannot be picked up accurately; it is difficult to distinguish useful seismic signals from high-amplitude noise
[0006] However, microseismic signals are different from general reflection ...

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
  • High-precision pickup method of first arrival of microseism
  • High-precision pickup method of first arrival of microseism
  • High-precision pickup method of first arrival of microseism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] The high-precision picking method of microseismic first arrival provided by the present invention comprises the following steps:

[0042] As we all know, microseismic signals are different from general reflection seismic signals, and are characterized by weak useful signals, complex wave fields, and multiple types of seismic phases. Therefore, the first-arrival picking of microseismic signals is mainly carried out according to the signal energy, phase and phase apparent velocity characteristic conditions. In order to pick up the first arrival of the travel time of the seismic phase of the accurate microseismic event, it is necessary to improve the signal-to-noise ratio processing of the microseismic event signal first. On this premise, good results can only be achieved by studying the method of picking up first arrivals.

[0043] For...

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 high-precision pickup method of the first arrival of microseism. The high-precision pickup method comprises the steps that the signal to noise ratio of microseism data is increased through the higher moment method; according to the fact of whether the current microseism wave meets all the following constraint conditions, namely the relation between the magnitude of amplitude and space, the lineup apparent velocity and the polarization characteristics, whether the microseism wave is the first arrival of the microseism is judged; according to perforation data, actual event data and the change rule of constraint conditions, by the adoption of a statistical analysis method, the threshold value of the constraint conditions is determined; under the constraint of the amplitude and the apparent velocity, according to the temporal and spatial variation characteristics of the travel time first arrival of a microseism event, the change law of the energy, the apparent velocity and the relevant information of travel time first arrival points in a big fixed time window and a small sliding time window is utilized for automatic pickup of the first arrival of the microseism event by means of the repeated iteration method. Application effects of the actual data of different areas show that the high-precision pickup method of the first arrival of the microseism is high in adaptability and reliable in result.

Description

technical field [0001] The invention relates to a method for picking up a microseismic first arrival with high precision, in particular to a method for picking up a microseismic first arrival with high precision. Background technique [0002] At present, there are mainly several methods for automatic first-arrival picking or phase identification of seismic signals, including energy ratio method, AIC algorithm, neural network method, fractal and fractal dimension method, polarization analysis method, and Kalman estimation, among which energy ratio method, AIC algorithm and neural network methods are most commonly used. [0003] The energy ratio method is the fastest and most widely used automatic picking method. In 1981, Kannasewich proposed to design and calculate the absolute value of seismic data, the long time window (LTA) and short time window (STA) of the energy or envelope surface as a characteristic function for identifying effective events. This method calculates th...

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): G01V1/28
Inventor 宋维琪
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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