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A Modeling Method of Shear Wave Migration Velocity

A technology of migration speed and modeling method, which is applied in the field of petroleum geophysical exploration, can solve the problems of heavy workload of human-computer interaction interpretation, heavy work of data processing, etc., to shorten the imaging processing cycle, improve accuracy, and reduce workload Effect

Active Publication Date: 2017-11-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, it is also necessary to check whether the event of the reflected wave group in the offset-corrected imaging gather is over-biased (low speed) or under-biased (high speed), the workload of human-computer interaction interpretation is huge, and it is the heaviest work in data processing link

Method used

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  • A Modeling Method of Shear Wave Migration Velocity
  • A Modeling Method of Shear Wave Migration Velocity
  • A Modeling Method of Shear Wave Migration Velocity

Examples

Experimental program
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Embodiment 1

[0085] Figure 4 A P-wave end-stack profile and a converted-wave end-stack profile are shown in one embodiment. in, Figure 4 (a) is the end-stack profile of P-wave, the recording time is 5 seconds, Figure 4 (b) is the final stack section of the converted wave, and the recording time is 8 seconds.

[0086] Figure 5 The P-wave end-stack section and converted-wave end-stack section after automatic layer matching are shown, as well as the P-wave and S-wave velocity ratio profiles obtained according to the time shift. in, Figure 5 (a) is the end-stack profile of P-wave, the recording time is 5 seconds, Figure 5 (b) is the converted wave final stack profile after compression, the recording time is 5 seconds, Figure 5 (c) is the P-to-S wave velocity ratio profile obtained according to the time shift, and the recording time is 5 seconds.

Embodiment 2

[0088] Figure 6 The P-wave migration velocity model obtained through the velocity interaction analysis of the L385 line in a certain work area is shown. Figure 6 The middle ordinate is the longitudinal wave round-trip travel time (milliseconds), the abscissa is the serial number of the gather, and the longitudinal wave velocity value is marked in the box. According to the method provided by the present invention, dynamic image warping technology DIW (Dynamic Image Warping) is applied to perform automatic horizon matching processing on the P-wave end-stack section and converted-wave end-stack section of the L385 line. In the process of horizon matching, the smooth vertical time-shift sequence between the P-wave end-stack section and the converted-wave end-stack section is calculated, and then the corresponding P-wave velocity ratio is calculated according to the time-shift.

[0089] Figure 7 The P-to-S wave velocity ratio profile of line L385 is shown. Figure 7 The middl...

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Abstract

The invention discloses a fast shear wave migration velocity modeling method. This method preferably uses dynamic image deformation optimization technology to automatically match the longitudinal wave final stack section and the converted wave final stack section. Under the optimal matching condition, the time shift sequence between the two final stack sections is obtained. Then, using the P-wave time-velocity pair as a control point, the trend of the P-wave velocity ratio is smoothed, and finally, according to the P-wave migration velocity model and the smoothed P-wave velocity The shear-wave migration velocity model is converted to provide an effective shear-wave migration velocity model for time-consistent converted-wave prestack time migration. In addition, through the secondary horizon matching of the time-consistent converted wave and P-wave migration profiles, the shear-wave migration velocity model can also be iteratively updated to achieve the accuracy required for the imaging velocity model. The invention greatly improves the efficiency of the conversion wave pre-stack migration velocity modeling, reduces the workload of human-computer interaction interpretation, and shortens the imaging processing period of the conversion wave pre-stack migration.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical exploration, in particular to a shear wave migration velocity modeling method applied to converted wave prestack time migration processing. Background technique [0002] Among the existing converted-wave migration velocity analysis and modeling techniques, the most representative method is first to perform converted-wave stacking on the entire survey line gather by gather based on the accurate P-wave migration velocity model and the initial shear-wave migration velocity model. Before the time migration processing, the reflection wave group event migration effect is performed point by point on the migration processed imaging gathers for shear wave velocity interpretation picking, and then the converted wave prestack time migration is performed again according to the new shear wave velocity model picked up by interpretation. shift processing. It is necessary to check again whether the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 黄忠玉刘兰锋王于静
Owner CHINA PETROLEUM & CHEM CORP