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A method and device for removing ghost reflection interference

A virtual reflection and seabed reflection technology, applied in the field of geological exploration, can solve the problems of incomplete restoration of seismic wavelet spectrum, low frequency loss, etc.

Active Publication Date: 2018-12-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods can only partially recover the frequency dips caused by ghost reflections, and cannot fully recover the loss of the seismic wavelet spectrum, especially the low frequency loss

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  • A method and device for removing ghost reflection interference
  • A method and device for removing ghost reflection interference
  • A method and device for removing ghost reflection interference

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Embodiment Construction

[0042] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0043] Considering that when the existing method is used to eliminate the noise interference generated by sea level ghost reflection multiple waves, the frequency depression caused by the ghost reflection can only be partially recovered, and the loss of the seismic wavelet spectrum cannot be fully recovered. The inventor proposed By direc...

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Abstract

The invention provides a method and a device for removing ghost reflection interference. The method comprises the steps of acquiring seismic data of each detection point in the frequency domain; acquiring the distance between each detection point and a seismic focus and the distance between the seal level to a sub-bottom reflection interface, and determining an offset factor reflecting the offset of each detection point according to the distances; determining the delay time of ghost reflection of each detection point according to a preset calculation method for the ghost reflection delay time on the basis of the offset factor; determining an operator for removing the ghost reflection of each detection point according to a preset calculation method for removing the ghost reflection on the basis of the delay time; and determining a frequency domain value of the seismic data with the ghost reflection interference being removed of each detection point according to the seismic data and the operator. In the embodiment of the invention, not only a low-frequency component of the seismic data in the frequency domain is recovered, and a high-frequency component of the seismic data is also recovered, so that the effective frequency band is effective expanded, the resolution and the signal-to-noise ratio of the seismic data are improved, and the noise interference of seal level ghost reflection multiple waves can be effectively removed.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and device for removing ghost reflection interference. Background technique [0002] With the development of seismic exploration technology, offshore oil and gas exploration is becoming more and more difficult and deeper, and the requirements for signal-to-noise ratio and resolution of seismic data are also getting higher and higher. Offshore streamer acquisition technology, the geophone is fixed on the streamer, and high-resolution 3D seismic data can be obtained. Specifically, the marine towline acquisition technology may be to fix fixed array geophones on the towline to receive seismic waves, and the same ship tows an air gun source to excite seismic waves. The precise position of the gunship can be provided by the Global Positioning System (GPS) or radio positioning based on the coast, and the position of the geophone on the streamer should also be pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
CPCG01V1/362
Inventor 高少武赵波黄少卿孙鹏远马凯张丽梅
Owner BC P INC CHINA NAT PETROLEUM CORP
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