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Method of pressing ghost waves of marine variable-depth cable earthquake data

A technology of seismic data and depth, applied in the direction of seismic signal processing, etc., can solve the problem that the influence of ghost waves cannot be completely eliminated, and achieve the effect of broadening the spectrum of seismic signals, improving accuracy, and improving resolution

Active Publication Date: 2015-02-18
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Although the existing ghost wave suppression technology can suppress some influences of ghost waves, it cannot completely eliminate the influence of ghost waves

Method used

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  • Method of pressing ghost waves of marine variable-depth cable earthquake data
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  • Method of pressing ghost waves of marine variable-depth cable earthquake data

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] Such as figure 1 As shown, the method for suppressing ghost wave of sea variable depth cable seismic data of the present invention comprises the following steps:

[0032] 1) Collect the seismic data received by the variable depth cable to form a common center point gather;

[0033] 2) Perform dynamic correction on the common center point seismic data, and perform Fourier transform on the common center point seismic data after dynamic correction to obtain the frequency spectrum of the original seismic data containing ghost waves;

[0034] 3) According to the different depths of the receiver points, the frequency spectrum of the obtained original seismic data containing ghost waves is simplified to obtain H;

[0035] S r(t)=w(t)*r(t) (1)

[0036] Among them, S r (t) represents the seismic signal reflected back from the ground, which is equiv...

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Abstract

The invention relates to a method of pressing ghost waves of marine variable-depth cable earthquake data. The method comprises the following steps: firstly, transforming variable-depth cable earthquake data to a frequency domain; then, fitting frequency spectrum in the frequency domain, so that the difference between the frequency spectrum of the synthesized data and the frequency spectrum of the actually received data is extremely small, and the ghost wave pressing problem is transformed into a frequency spectrum fitting inversion problem. According to the characteristic of the variable-depth cable data, in an inversion process, a horizontal restrain item is introduced, so that the frequency spectrums on a trapped wave point position supplement with one another horizontally. The method of pressing ghost waves of variable-depth cable data disclosed by the invention is adopted, so that gradation is distinct; the transverse restrain item is adopted and a restrain factor is used to control the transverse restrain item, and therefore, the tapped wave effects of the ghost wave-pressed earthquake data are corrected in the frequency domain very well, the noises can be restrained very well in a time domain, and very good ghost wave pressing effects are achieved. The method disclosed by the invention can be directly used to a treatment process of acquired marine variable-depth cable earthquake data.

Description

technical field [0001] The invention relates to the field of offshore oil and gas exploration, in particular to a method for suppressing ghost waves of seismic data of variable-depth cables in the sea. Background technique [0002] Seismic exploration is an important means of oil and gas exploration, especially offshore oil and gas exploration. Due to the high drilling cost and the lack of geological and other data, seismic exploration plays a more important role in offshore oil and gas exploration. Collecting seismic data in a wide frequency band has always been the pursuit of marine seismic exploration, but so far, due to various constraints, this is still an unattainable goal. The depth of the traditional marine acquisition streamer is fixed, and the obtained ghost wave notch frequency of the receiver point is the maximum frequency that can be recovered. In order to make the entire frequency higher, the streamer must be fixed at a depth as shallow as possible, but the no...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 王建花李绪宣张金淼郝振江杨俊孙文博朱振宇张云鹏糜芳薛东川
Owner CHINA NAT OFFSHORE OIL CORP
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