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Imaging-domain stereo chromatography velocity inversion method

A velocity inversion and three-dimensional technology, applied in the field of three-dimensional tomographic velocity inversion in the imaging domain, can solve the problems of large workload and inaccurate data space picking, achieve high-speed inversion accuracy, improve accuracy and stability, and The effect of using value

Active Publication Date: 2019-01-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Therefore, for the problems of inaccurate data space picking and heavy workload

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  • Imaging-domain stereo chromatography velocity inversion method
  • Imaging-domain stereo chromatography velocity inversion method
  • Imaging-domain stereo chromatography velocity inversion method

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Embodiment Construction

[0054] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0055] Such as Figure 17 as shown, Figure 17 It is a flow chart of the imaging domain stereo tomography velocity inversion method of the present invention.

[0056] In step 101, pre-stack depth migration is performed on the input initial velocity field to obtain a depth migration profile, and an angle-domain common imaging point gather (ADCIG) is extracted.

[0057] Step 102, pick up the position of the initial reflection point and the structural inclination at the corresponding position in the migration profile, and obtain the ray parameters at the shot and inspection points. In the angle-domain common imaging point gather (ADCIG), the residual curvature and depth residuals at the corresponding positions are picked up and converted into traveltime...

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Abstract

The invention provides an imaging-domain stereo chromatography velocity inversion method. The method comprises: step one, carrying out pre-stack depth migration on an inputted initial velocity field to obtain a depth migration profile and extracting an angle-domain common imaging point set; step two, picking up a residual curvature and a depth residual of a corresponding position in the angle-domain common imaging point set, and carrying out conversion to obtain a travel time residual; step three, calculating stereo chromatography data space; step four, carrying out ray tracing in a current velocity model to obtain travel time information and an inversion kernel function in the model; and step five, establishing an inversion equation set by using the obtained stereo chromatography kernel function and residuals of real data space and data space in the model, and carrying out calculation to obtain an updating amount of the model, thereby completing the iteration. With the imaging-domainstereo chromatography velocity inversion method, the accurate stereo chromatography data space is obtained; the inversion precision and stability are improved; and the imaging-domain stereo chromatography velocity inversion method has the great utilization value in stereo chromatography inversion practice in future.

Description

technical field [0001] The invention relates to the field of oil and gas exploration seismic data processing, in particular to a three-dimensional tomography velocity inversion method in an imaging domain. Background technique [0002] The inversion of seismic velocity is an important part of seismic data processing. Stereo tomography inversion is proposed to solve the problem that traditional reflection tomography has difficulty in picking events in data with low signal-to-noise ratio. This method redefines the data space and model space of tomographic inversion, that is, the stability and accuracy of the inversion are enhanced by using the travel time of seismic waves, the positions of shot and checkpoints, and the direction of ray emission from shot and checkpoints while constraining the velocity model. In stereo tomography velocity inversion, the accuracy of data space picking is one of the most important factors affecting the inversion effect. Generally, the data spac...

Claims

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 田坤于海铖王常波刘立彬张学涛步长城王蓬徐瑞
Owner CHINA PETROLEUM & CHEM CORP
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