A Method of Extracting Reverse Time Migration Angle Gather

A technology of reverse time migration and angle gather, which is applied in the field of seismic data processing of oil and gas exploration, can solve the problems of low accuracy of angle gather and cannot meet the inversion high precision reverse time migration, etc., and achieves good imaging effect and is beneficial to migration. Speed ​​analysis and the effect of improving extraction accuracy

Active Publication Date: 2019-04-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the inventors found that the existing method for extracting common image point gathers in the angle domain is usually based on the poynting vector class. Although this extraction method has the advantages of high efficiency and high angle resolution, it is not suitable for processing complex areas. In terms of angle gathers, the accuracy of the processed angle gathers is low, which cannot meet the requirements of inversion to obtain high-precision reverse time migration.

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  • A Method of Extracting Reverse Time Migration Angle Gather
  • A Method of Extracting Reverse Time Migration Angle Gather
  • A Method of Extracting Reverse Time Migration Angle Gather

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Embodiment Construction

[0043] The invention provides a method for extracting reverse-time migration angle gathers, which improves the extraction accuracy of angle gathers in complex areas, and solves the problem of event crossing well, and has a good imaging effect on complex areas, and is effective Useful for drift velocity analysis.

[0044] Embodiments of the present invention will be described in detail below in conjunction with the following drawings.

[0045] The present invention provides a method for extracting reverse time migration angle gathers, such as figure 1 As shown, the extraction method specifically includes:

[0046] Step 1: Perform finite difference forward calculation on the preset acoustic wave model to obtain the input shot record;

[0047] Among them, as a preferred embodiment of the present invention, a first-order stress-velocity form acoustic wave model is selected as the preset acoustic wave model. For the first-order stress-velocity form of the acoustic wave model, th...

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Abstract

The present invention relates to the field of oil and gas exploration seismic data processing and particularly relates to a method for extracting a reverse time migration angle gather. According to the extraction method, the extraction precision of a complex regional angle gather is improved, a problem of event crossing is solved well, an imaging effect of a complex region is good, and the migration velocity analysis is facilitated. The extraction method comprises a step of carrying out finite difference forward calculation on a preset acoustic wave model to obtain an input shot record, a step of carrying out forward extrapolation from a seismic source point to obtain a shot point wave field, a step of carrying out forward extrapolation from detection point to obtain a detection point wave field, a step of carrying out Fourier transform to obtain a shot point local slowness region, a detection wave point local slowness region and carrying out decomposition to obtain a shot point local angle component and a detection point local angle component, and a step of determining an angle domain imaging condition to extract and obtain the reverse time migration angle gather.

Description

technical field [0001] The invention relates to the field of oil and gas exploration seismic data processing, in particular to a method for extracting reverse time migration angle gathers. Background technique [0002] Migration velocity modeling is an important step in seismic data processing, and a high-precision migration velocity model is a key factor for obtaining high-quality migration imaging results. Among them, reverse time migration shows its superiority in improving the imaging quality of complex media. However, reverse time migration is very sensitive to velocity accuracy. In order to ensure high accuracy of reverse time migration imaging, the accuracy of velocity inversion must be improved. The angle-domain common-imaging point gather is the output item of reverse time migration, and the high-precision migration velocity field, amplitude, phase and other information can be obtained through the inversion of the angle-domain common-imaging point gather. At the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/34
CPCG01V1/282G01V1/345G01V2210/74
Inventor 田坤于海铖王常波张学涛步长城李国磊王彦军张敬仁揭景荣
Owner CHINA PETROLEUM & CHEM CORP
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