Unlock instant, AI-driven research and patent intelligence for your innovation.

Static correcting method during converted wave delaying

A correction method and technology for converting waves, applied in seismic signal processing and other directions, can solve the problems of different delays of converted waves, and achieve the effect of improved continuity and remarkable effect.

Inactive Publication Date: 2007-07-11
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, there is a certain angle between the upgoing wave and the vertical direction, and the time difference is different from the delay time of the conversion wave. If the relative time difference is directly used as the relative static correction value, there is still a certain problem of the static correction value.

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
  • Static correcting method during converted wave delaying
  • Static correcting method during converted wave delaying
  • Static correcting method during converted wave delaying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Since the time difference between the first arrival of the converted wave and the first arrival of the longitudinal wave in the common receiver gather is constant, the X component and the Z component (the first arrival of the X component is the energy of the uplink transmitted and converted shear wave, and the first arrival of the Z component is the energy of the upgoing longitudinal wave refraction) at the common receiver point gather. Cross-correlation is carried out within a given time window, and the cross-correlation results of the detection points are superimposed to obtain a cross-correlation superposition section, and the first-arrival time difference Δt between the converted wave and the longitudinal wave is determined according to the energy peak value (Fig. 3). Delay time d from Δt and the longitudinal wave delay at the corresponding detection point p and calculate the converted wave delay time d of the detection point s .

[0042]When the surface shear wave...

Embodiment 2

[0044] Since the first-arrival time difference between the converted wave and the P-wave in the common receiver gather is constant, the X component and the Z component of the receiver are cross-correlated within a given time window, and the cross-correlation results of the receiver points are superimposed to obtain a cross-correlation superposition profile. The energy peak value determines the first arrival time difference Δt between the converted wave and the longitudinal wave. Delay time d from Δt and the longitudinal wave delay at the corresponding detection point p and calculate the converted wave delay time d of the detection point s .

[0045] The thickness of the near-surface model is calculated from the longitudinal wave data, and the surface shear-wave velocity is calculated according to formula (5) to establish a shear-wave near-surface model. Then calculate the static correction amount of the reference plane of the shear wave according to formula (6).

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 present invention relates to a set of complete converted wave static correction method. Said method adopts compressional excitation three-component receiving, and includes the following steps: making the geophone stations correspondent to Z-component and X-component implement mutual correlation, and superimposing the mutual correlation results of geophone stations to obtain mutual correlation superimposed profile, utilizing peak position of said profile to define first arrival difference of two components, and utilizing said first arrival difference to calculate converted wave delay time, then using said converted wave delay time to create the shear wave near-surface model, finally resolving accurate geophone station shear wave datum static correction quantity. Said obtained static correction quantity is the result corrected to datum level.

Description

technical field [0001] The invention relates to petroleum geophysical exploration data processing technology, which is a method for calculating the shear wave static correction amount by establishing a shear wave near-surface model when calculating the delay of the converted wave by using the first arrival time difference caused by the uplink transmitted converted wave and the longitudinal wave in the weathered layer. Background technique [0002] Converted wave seismic exploration is a special exploration method. It excites the longitudinal wave through the explosion in the well or the vibrator on the ground. The longitudinal wave propagates downward in the formation. After reaching the interface, part of the energy is converted into a shear wave (SV wave and SH wave). The three components of P-wave, SV-wave and SH-wave propagate upward and reach the surface respectively. The surface is received by a three-component geophone to obtain complete seismic wavefield information...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36G01V1/28
Inventor 杨海申李彦鹏任艳永郭敏
Owner BC P INC CHINA NAT PETROLEUM CORP