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Multi-component seismic data migration imaging method and system

A technology of migration imaging and seismic data, applied in the field of exploration seismic, can solve the problems of amplitude imbalance, low resolution, and difficulty in actual production, and achieve the effects of improving accuracy, high signal-to-noise ratio, and high resolution

Pending Publication Date: 2021-03-09
CHINESE ACAD OF GEOLOGICAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practice, due to factors such as incomplete seismic data and noise, limited acquisition aperture, drastic change in medium velocity, and large approximation errors of migration operators, there are obvious acquisition footprints and resolution low rate, severe artifacts, and amplitude imbalance, which have a great impact on subsequent data processing and interpretation, making it difficult to be directly used in actual production, and making it difficult to take advantage of multi-component exploration

Method used

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  • Multi-component seismic data migration imaging method and system
  • Multi-component seismic data migration imaging method and system
  • Multi-component seismic data migration imaging method and system

Examples

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example 1

[0161] figure 2 is the salt dome model migration velocity model, (a) P-wave velocity model, (b) S-wave velocity model. 39 explosion sources are set on this model, the source wavelet is set as Reck wavelet, the main frequency is 15 Hz, the initial source point is located at (70m, 100m), and the shot interval is 150m. The receiving observation system on both sides of the middle shooting is adopted, the maximum offset distance of one side is 2900m, the minimum offset distance is 0m, and the track spacing is 10m. image 3 yes figure 2 The multi-shot stacked migration section of the salt dome model shown: where, image 3 (a) is the P-wave migration profile obtained by the reverse time migration method, image 3 (b) is the shear wave migration profile obtained by the reverse time migration method, image 3 (c) is the longitudinal wave migration profile utilizing the gained of the present invention, image 3 (d) is the shear wave migration profile obtained by using the present...

example 2

[0163] Figure 5 is the Marmousi-2 migration model provided by the present invention, wherein, (a) the longitudinal wave velocity model, (b) the shear wave velocity model, and (c) the density model. This model is one of the international standard models to verify the imaging effects of various migration methods. The model has a depth of 5.4km and a lateral width of 27.2km. The spatial grid size used for migration is 10m, with a total of 109 shots. The initial shot point is located at 2.55km of the model, and the shot point is placed at a depth of 150m. The shot interval is 200m. The shots are fired in the middle and received on both sides. Each shot is received with 501 shots. , the minimum offset is 0m, the maximum offset is 2500m, the trace spacing is 10m, the recording time length is 8.0s, and the time step is 1ms. The Reich wavelet with a main frequency of 15Hz is used as the source time function. Figure 6 yes Figure 5 The multi-shot stacked migration section of the M...

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Abstract

The invention relates to a multi-component seismic data migration imaging method and system. The method comprises steps of determining a background pure wave seismic wave field for each shot; determining an observation pure wave seismic record of each gun; determining a pure wave seismic record residual error according to the observed pure wave seismic record; reversely extending the pure wave seismic record residual error to obtain a pure wave back propagation seismic wave field, solving a background pure wave seismic wave field, and calculating a gradient profile of the iteration; based on the gradient profile, constructing a descent direction profile of the iteration; obtaining a predicted pure wave seismic wave field by using the descending direction profile, and extracting a predictedpure wave seismic record increment; estimating an optimal step length; updating the migration profile and predicting the pure wave seismic record according to the descending direction profile, the pure wave seismic record increment and the optimal step length; judging whether the current iteration meets a convergence standard or not; and if so, outputting the offset profile at the current moment.According to the method, the multi-wave migration section with high resolution, high signal-to-noise ratio and amplitude fidelity can be obtained.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a multi-component seismic data migration imaging method and system. Background technique [0002] Seismic exploration method is an important means to study the internal structure of the earth and detect underground resources such as oil and natural gas by using the propagation law of seismic waves in the underground medium. Seismic waves are elastic waves, including longitudinal waves and shear waves, and the two wave types contain different information about the properties of underground media. Restricted by factors such as technical level and economic benefits, for a long time, seismic exploration has mainly been a longitudinal-wave exploration method that only uses longitudinal-wave information, and almost ignores shear-wave information that contains important application values. With the increasing difficulty of oil and gas exploration and the continuous improvement of exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36G01V1/34G01V1/28G01V1/30
CPCG01V1/36G01V1/362G01V1/345G01V1/282G01V1/301G01V1/306G01V2210/512G01V2210/64G01V2210/74
Inventor 韩建光吕庆田刘志伟
Owner CHINESE ACAD OF GEOLOGICAL SCI
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