Thin bed identification method of seismic prospecting

A seismic exploration and identification method technology, which is applied in the field of oil and gas geophysical prospecting engineering, can solve problems such as difficult identification of thin layer signals, and achieve the effect of improving identification ability and eliminating interference

Active Publication Date: 2017-05-03
PETROCHINA CO LTD
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Problems solved by technology

[0005] In the original seismic section, due to the influence of factors such as seismic frequency and signal absorption and attenuation, it is

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  • Thin bed identification method of seismic prospecting
  • Thin bed identification method of seismic prospecting
  • Thin bed identification method of seismic prospecting

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[0050] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0051] see figure 1 , which shows the flow of a method for identifying thin layers in seismic exploration according to an embodiment of the present invention. The method for identifying thin layers in seismic exploration includes the following steps:

[0052] (1) Hilbert transform the seismic post-stack signal to obtain the instantaneous phase of the seismic post-stack signal;

[0053] (2) Obtain the time-phase relationship diagram of the seismic post-stack signal based on the instantaneous phase;

[0054] (3) Perform wavelet transformation based on the time-phase relationship diagram of the seismic post-stack signal to obtain the reconstruction time-scale relationship diagram of the seismic post-stack signal;

[0055] (4) Based on ...

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Abstract

The invention discloses a thin bed identification method of seismic prospecting, and belongs to the field of oil-gas geophysical prospecting engineering. The method comprises the following steps that (1) Hilbert transform is carried out on a seismic post-stack signal to obtain an instant phase of the seismic post-stack signal; (2) a time-phase relation diagram of the seismic post-stack signal is obtained according to the instant phase; (3) wavelet transform is carried out on the basis of the time-phase relation diagram of the seismic post-stack signal to obtain a time-scale relation diagram; (4) an abnormal point is extracted on the basis of the time-scale relation diagram; and (5) information of a reflected wave signal is obtained on the basis of the abnormal point. According to the method provided by the invention, seismic phase data can be re-explained by utilizing Hilbert transform on the basis of a phase criterion, further a position identification research can be carried out, the thin bed identification capability can be improved effectively, and interference of aftershock in a result can be eliminated to certain extent.

Description

technical field [0001] The invention relates to the field of oil and gas geophysical prospecting engineering, in particular to a method for identifying thin layers in seismic exploration. Background technique [0002] Seismic data interpretation is to convert seismic information into geological information. The core is to apply seismic exploration principles and basic geological theories based on the reflection characteristics of seismic sections and seismic information, and endow it with clear geological meaning and conceptual model. At present, in seismic data processing and interpretation, there is a better display method for thicker reservoirs. Generally, synthetic records can be made based on seismic reflection signals and logging curves, and thicker formations can be clearly displayed. [0003] In seismic exploration, the concept of thin bed is relative. Because the definition of a thin layer in seismic exploration is based on its vertical resolution, that is, for sei...

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/36
Inventor 金凤鸣易远元李晓燕肖伯勋汪剑谷文彬唐传章王鑫祖志勇窦连彬刘淑贞付亮亮王泽丹叶秋焱
Owner PETROCHINA CO LTD
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