Common reflection point gather optimized processing method and system

A common reflection point gather and processing method technology, applied in the field of seismic inversion imaging processing, to achieve strong information correlation, improve overall quality, and improve the effect of signal-to-noise ratio

Active Publication Date: 2016-12-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method that can effectively solve the deficiencies in the traditional method in view of the problems existing in the prior art. While improving the overall signal-to-noise ratio of the gather, the residual time difference can be corrected and the track Method and system for optimal processing of common reflection point gathers with overall quality

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  • Common reflection point gather optimized processing method and system
  • Common reflection point gather optimized processing method and system
  • Common reflection point gather optimized processing method and system

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specific Embodiment 1

[0098] The specific implementation steps of specific embodiment 1 of the present invention are:

[0099] Step 1: Use conventional quadratic polynomials to analyze seismic data (S in the cross-correlation objective function k , S j That is, the actual discrete seismic data, the fitting relation t=t 0 +c 1 x+c 2 x 2 The obtained time t is the discrete-time sampling point corresponding to the seismic data S(t)) for fitting to estimate the stratum dip, such as image 3 As shown, it is a schematic diagram of the stratum dip estimated by the discrete scanning method of the present invention. In the calculation sliding time window, the local event satisfies the following quadratic fitting polynomial:

[0100] t=t 0 +c 1 x+c 2 x 2 Formula 1)

[0101] Among them: x is the relative track number of the fitting center track, x has positive and negative directions, and its value is x=-M,-M+1,...,-1,0,1...,M-1 , M, M is half of the number of fitting channels, t 0 is the time to...

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Abstract

The invention relates to a common reflection point gather optimized processing method and system. The common reflection point gather optimized processing method comprises the steps of firstly carrying out estimation on stratum inclination by adopting a discrete scanning method, and to enable inclination estimation to be more accurate, fitting seismic data by adopting a conventional quadratic polynomial so as to estimate the stratum inclination; then applying median filtering in the direction where a central sampling point event is located in a sliding time window, wherein a filtering result acts as output of a final central sampling point, namely, structural median filtering, and the signal-to-noise ratio of the gather is improved after processing; and finally, establishing a model trace on a stack section of the common reflection point gather, and carrying out residual moveout correction on the denoised common reflection point gather. The direction stratum inclination has higher information correlation, so that the method provided by the invention can effectively solve defects existing in a traditional method and enables the residual moveout to be corrected while improving the overall signal-to-noise ratio of the gather, the gather is flattened, the overall quality of the gather is improved, and effective signals and edge and detail features of strata such as faults and cracks can be well kept.

Description

technical field [0001] The invention belongs to the field of seismic inversion imaging processing in seismic exploration data processing, and in particular relates to a common reflection point gather optimization processing method and system. Background technique [0002] The common reflection point (CRP) gather obtained by prestack migration is composed of reflection information reflecting the same underground point, which basically eliminates the influence of interface curvature and inclined strata in theory, and the total superposition of a series of common reflection point gathers can be obtained Offset profile. For precise structural imaging, due to the influence of factors such as the signal-to-noise ratio of seismic data, the unevenness of the gather, and the stretching of sub-fluctuations, the stacking of common reflection point gathers cannot obtain ideal imaging results; for the pre-stack based on CRP gathers Inversion puts forward higher requirements for the proc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/36
Inventor 许璐刘志成谢金娥贾春梅宋林
Owner CHINA PETROLEUM & CHEM CORP
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