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Method employing surface wave information in seismic records to investigate surface structure

A technology for surface structure and information investigation, applied in the field of seismic exploration

Inactive Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

But at present, the route is mainly in the stage of theoretical exploration, and there are still some theoretical and technical problems waiting to be solved

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  • Method employing surface wave information in seismic records to investigate surface structure
  • Method employing surface wave information in seismic records to investigate surface structure
  • Method employing surface wave information in seismic records to investigate surface structure

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Embodiment Construction

[0023] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0024] The invention principle of the method of utilizing the surface wave information in the seismic record of the present invention to investigate the surface structure is that the frequency of the surface wave is f i , the time difference of the surface waves recorded by adjacent geophones is △t or the phase difference is △Φ, then the propagation velocity of the surface waves within the length of △X of the adjacent track is:

[0025] Under the condition of satisfying the space sampling theorem, the average wave velocity in the measurement range N △x is:

[0026]

[0027]

[0028] A series of V at the frequency fi is measured at the same measuring point Ri value, you can get a V R --f curve, the so-called dispersion curve.

[0029] Sur...

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Abstract

The invention provides a method employing surface wave information in seismic records to investigate a surface structure. The method employing surface wave information in the seismic records to investigate the surface structure comprises steps that: step 1, original data is inputted, and original data processing is carried out; step 2, surface wave waveform extraction of the data processed in the step 1 is carried out in a frequency wave-number domain to acquire surface wave frequency dispersion data of base-order components; step 3, data stack of the surface wave frequency dispersion data acquired in the step 2 is carried out in a distance frequency domain to form a frequency dispersion file; and step 4, inversion fitting of the frequency dispersion file acquired in the distance frequency domain in the step 3 is carried out to acquire a stratum model integration accomplishment graph. The method employing surface wave information in the seismic records to investigate the surface structure settles a problem of strict requirements for a stratum speed and wave impedance existing in a traditional surface structure method and can acquire accurate shallow surface thickness and the speed data.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a method for investigating surface structure using surface wave information in seismic records. Background technique [0002] The methods commonly used in seismic exploration near-surface structure investigation have their own advantages and disadvantages. Lithology coring is more reliable, but the cost is high and it is destructive to the formation; The reflection is weak and difficult to distinguish, especially the refraction method requires that the velocity of the lower medium must be greater than that of the upper medium. If there is a low-velocity interlayer in the formation and the velocity is reversed, the refraction method will be powerless. The surface wave prospecting method is a new type of shallow seismic prospecting method, which is not restricted by the above physical property conditions, and only requires the difference in shear wave velocity among the media of...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 冯刚段卫星宁鹏鹏卢湘鹏刘斌张光德何京国张在武田根海
Owner CHINA PETROLEUM & CHEM CORP
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