Spectral decomposition based post-stack seismic data resolution ratio increasing method

A technology of seismic data and spectral decomposition, applied in seismic signal processing and other directions, can solve problems such as difficulty in distinguishing objects

Inactive Publication Date: 2014-10-29
GEOPHYSICAL EXPLORATION CO OF CNPC CHUANQING DRILLING ENG CO LTD
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Problems solved by technology

Although conventional deconvolution such as spectral simulation is the most widely used method to improve the res

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  • Spectral decomposition based post-stack seismic data resolution ratio increasing method
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[0060] Hereinafter, the method for improving the resolution of post-stack seismic data based on spectral decomposition according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0061] First, a brief description of the technical terms involved in this application.

[0062] Seismic data: A seismic source located on the surface or stratum emits seismic waves. The seismic waves propagate into each stratum, and are reflected back to the surface by each stratum to form a reflected wave. The reflected wave contains information about the stratum structure. The reflected wave constitutes the seismic data. It can be called seismic record or seismic data.

[0063] Seismic wavelet: A seismic wavelet is a signal with a definite starting time, limited energy, and a certain continuation length. It is the basic unit in seismic records.

[0064] Time window: Since seismic data is usually displayed with time as the vertical s...

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Abstract

The invention provides a spectral decomposition based post-stack seismic data resolution ratio increasing method. The method includes the steps: a, acquiring a post-stack seismic record; b, separating and extracting a secondary spectrum of a seismic wavelet from a secondary spectrum in the post-stack seismic record, and forming a zero-phase wavelet of the seismic record; c, building a seismic record reflection coefficient spectral decomposition object function based on a multilayered model by the aid of a spectral decomposition technology according to a reflection coefficient parity decomposition theory; d, globally optimizing the seismic record reflection coefficient spectral decomposition object function by the aid of a quick simulated annealing nonlinear optimization algorithm to inverse a seismic record reflection coefficient; e, convoluting the zero-phase wavelet of the seismic record and the seismic record reflection coefficient with the even component proportion being increased so as to form a seismic record with increased resolution ratio. According to the method, seismic data resolution ratio can be increased while thin interbed distinguishing capacity of seismic data can be improved.

Description

technical field [0001] The invention relates to petroleum seismic exploration, which belongs to the field of seismic exploration data processing, and more specifically relates to a method for improving the resolution of post-stack seismic data based on spectrum decomposition. Background technique [0002] With the development of exploration and development, seismic exploration has shifted from simple structural exploration to exploration of complex surface, complex structures, fractures, thin reservoirs and remaining oil in old oilfields. The exploration of remaining oil in thin reservoirs and mature fields has a direct relationship with seismic imaging resolution. At present, the main frequency of the seismic wavelet is about 30 Hz, and it is difficult to distinguish its top reflection and bottom reflection event for a thin layer below 25 meters. However, the thickness of industrial target geological bodies is generally 10 meters or less. Seismic event tracking is not eno...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 张华何光明周阿波巫芙蓉陈爱萍金德刚罗红明曹中林熊晶璇
Owner GEOPHYSICAL EXPLORATION CO OF CNPC CHUANQING DRILLING ENG CO LTD
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