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Initial model establishment method based on pre-stack seismic data Q value spectrum analysis

A pre-stack seismic and initial model technology, applied in the field of petroleum and geological exploration, to achieve the effect of improving imaging quality, simple and convenient method, and improving inversion accuracy and efficiency

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of establishing the initial model, both efficiency and accuracy are important. Traditional Q-value modeling techniques are difficult to quickly provide a reliable Q-value tomographic initial model.

Method used

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  • Initial model establishment method based on pre-stack seismic data Q value spectrum analysis
  • Initial model establishment method based on pre-stack seismic data Q value spectrum analysis
  • Initial model establishment method based on pre-stack seismic data Q value spectrum analysis

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Experimental program
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Effect test

Embodiment 1

[0048] As mentioned above, with the continuous improvement of seismic exploration precision, the influence of the absorption and attenuation characteristics of the earth medium on seismic wave imaging has attracted more and more attention. The accurate Q value model can effectively compensate the absorption attenuation effect of the actual medium and improve the imaging quality. The combination of tomographic technology and Q modeling technology can establish an accurate Q value model, but the quality of the initial model directly determines the inversion accuracy and efficiency. How to quickly and stably establish the initial model of Q value tomography is a technical difficulty at present.

[0049] Aiming at this, the present invention proposes a new initial model establishment method based on Q-value spectral analysis of pre-stack seismic data, aiming at providing a reliable initial model for Q-value tomographic inversion technology.

[0050] Such as figure 1 As shown, th...

Embodiment 2

[0081] Next, in this embodiment, the theoretical correctness and adaptability of the above-mentioned method will be proved by combining the processing process of the actual seismic data of an oil field.

[0082] Such as figure 2 As shown, in order to simulate a single-shot seismic record, a shot is fired in the middle of the flat layer model, and a total of 280 channels are received on both sides, with a channel spacing of 10m and a sampling interval of 1ms. The horizontal axis represents distance (km), and the vertical axis represents time (s). In order to avoid the direct wave, the seismic response in the red frame is selected as the target data.

[0083] Such as image 3 As shown, using the rms velocity pair figure 1 The shot records are tracked, and the Q-spectrum analysis is performed on the tracked seismic data to obtain the equivalent Q-spectrum. On the Q spectrum, it can be seen that there are obvious focused energy clusters, and the Q value corresponding to the m...

Embodiment 3

[0091] In addition, this embodiment also provides a storage medium in which a computer program is stored, which is characterized in that, when the computer program is executed by a processor, the above-mentioned initial model establishment based on the Q-value spectrum analysis of pre-stack seismic data is realized method steps.

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Abstract

The invention provides an initial model establishment method based on pre-stack seismic data Q value spectrum analysis, a storage medium and computer equipment. The method comprises the following steps: determining a hyperbolic trajectory of each time depth by using pre-stack seismic data with relatively small information destruction degree through a root mean square velocity, intercepting data on the trajectory by using a Hanning window function, extracting attenuation characteristics of different seismic traces, and calculating to obtain a Q spectrum through a spectrum analysis technology for Q value extraction; the most reasonable equivalent Q value can be determined on the Q spectrum through the energy focusing degree, and finally the Q value is converted into a layer Q value.

Description

technical field [0001] The invention relates to the technical field of petroleum and geological exploration, in particular to an initial model establishment method based on Q-value spectrum analysis of pre-stack seismic data, as well as corresponding storage media and computer equipment. Background technique [0002] With the continuous improvement of seismic exploration precision, the influence of the absorption and attenuation characteristics of the earth medium on seismic wave imaging has attracted more and more attention. The absorption and attenuation of the actual medium will not only cause the loss of seismic wave energy, but also reduce the main frequency of seismic signals, which seriously affects the imaging effect of deep reflection interfaces. The quality factor Q is one of the commonly used parameters to describe the absorption and attenuation of seismic waves in the medium. An accurate Q model can effectively improve the quality of seismic data. How to obtain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/301G01V1/282G01V1/36G01V2210/43
Inventor 蔡杰雄刘俊辰郑浩
Owner CHINA PETROLEUM & CHEM CORP