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A Velocity Analysis Method Based on Real-time Energy Spectrum

A technology of velocity analysis and energy spectrum, applied in seismic signal processing and other directions, can solve the problem of inability to add or reduce, and achieve the effect of flexible selection, accurate velocity information, and reduction of iterations.

Active Publication Date: 2016-09-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned conventional speed picking method usually only utilizes the existing speed information of the previous round of speed analysis for speed scanning, but does not make full use of the more accurate speed picked up by the current round to guide the speed picking of surrounding points
Moreover, the above-mentioned conventional methods have usually selected the CMP point (velocity analysis point) for analysis before the velocity analysis, and cannot add or subtract during the current round of velocity analysis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0046] a. Select the speed analysis points (CMP points) to be analyzed, such as: from CMP1100 to CMP3500 with an interval of 100, that is, 1100, 1200, 1300...3500, a total of 25 points.

[0047] b. Interpolate the pick-up speed V1 of the last wheel according to the conventional method. After interpolation, the scanning speed Vmid1100 of CMP1100 is obtained, that is, the scanning speed Vmid1100 of the first speed analysis point is obtained, and the energy spectrum is generated by using the scanning speed Vmid1100 of the first speed analysis point Semb1100, and select CMP1100, that is, all time-velocity pairs of the first velocity analysis point on the energy spectrum according to the conventional method, and obtain the pick-up velocity V of the first velocity analysis point Semb1100 .

[0048] c. The pick-up speed V of the first speed analysis point Semb1100 Carry out speed interpolation with the pick-up speed V1 of the last wheel, and obtain the scanning speed V of CMP1200, w...

example 2

[0052] On the basis of Example 1, add the velocity analysis point CMP1250 between CMP1200 and CMP1300 during the velocity analysis process, that is, the velocity analysis point after CMP1250. If CMP1300 is not analyzed, use the steps b and c picked up in Example 1 Pickup speed V of the first speed analysis point semb1100 , the pick-up speed V of the second speed analysis point semb1200 Perform speed interpolation with the pick-up speed V1 of the last wheel to obtain the scanning speed V of the CMP1250 mid1250 , use the scan speed of CMP1250 to generate the real-time energy spectrum of CMP1250, pick up all the time-velocity pairs of CMP1250 on the real-time energy spectrum of CMP1250 and get the pick-up speed V of CMP1250 semb1250 ; Then bring the picking speed of CMP1100, CMP1200, CMP1250 into the speed interpolation, scanning speed calculation, energy spectrum generation and time-velocity pair picking of CMP1300 and subsequent speed analysis points; finally add the picking s...

example 3

[0054] On the basis of example 1 and after the velocity analysis, the velocity analysis point CMP1250 is added between CMP1200 and CMP1300, that is, the velocity analysis points after CMP1250 such as CMP1300, CMP1400... have been analyzed using step b, step c and step d in example 1 And pick up and get the round pick up speed V2. At this time, use the pick-up speed V2 of the current wheel for speed interpolation to obtain the scanning speed V of the CMP1250 mid1250 , using the CMP1250’s scan speed V mid1250 Generate a real-time energy spectrum of the CMP1250, pick up all time-velocity pairs of the CMP1250 on the real-time energy spectrum of the CMP1250 and get the pickup velocity V of the CMP1250 semb1250 ; Then add the pick-up speed of CMP1250 to the pick-up speed V2 of the current round to get the new pick-up speed V3 of the current round.

[0055] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0056] 1. The method ...

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PUM

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Abstract

The velocity analysis method based on the real-time energy spectrum disclosed by the present invention comprises the following steps: sequentially select n velocity analysis points along the survey line; perform velocity interpolation on the pick-up velocity of the last wheel to obtain the scanning velocity of the first velocity analysis point, and use the first The scanning speed of the velocity analysis point generates the energy spectrum of the first velocity analysis point, picks up all the time-velocity pairs of the first velocity analysis point on the energy spectrum of the first velocity analysis point and obtains the picking of the first velocity analysis point Speed: Interpolate the pick-up speed of the first speed analysis point and the pick-up speed of the last wheel to obtain the scan speed of the second speed analysis point after interpolation, and use the scan speed of the second speed analysis point to generate the second speed analysis The real-time energy spectrum of the point is picked up on the real-time energy spectrum of the second speed analysis point and the pick-up speed of the second speed analysis point is obtained; the pick-up speed of n speed analysis points is obtained in turn and the pick-up speed of the current round is obtained.

Description

technical field [0001] The present invention relates to the technical field of seismic data processing in geophysical exploration, and more specifically, relates to a velocity analysis method applied to the establishment of a velocity model in the process of seismic data processing in geophysical exploration. Background technique [0002] Conventional velocity analysis is to use the existing velocity of the previous round of velocity analysis to scan the energy spectrum to obtain the energy spectrum, and to pick up the velocity on the energy spectrum, and use the picked velocity to correct the real-time motion of the CMP gather (common center point gather). The quality control of speed picking, and on the basis of the above speed analysis, the speed of picking is mapped to the multi-channel horizontal stacking section for speed correction. [0003] For example, the Chinese invention patent document with the announcement number CN101251604B and the announcement date of Februa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 熊晶璇沈平何光明陶正喜刘鸿巫骏朱晨
Owner BC P INC CHINA NAT PETROLEUM CORP