An Optimal Processing Method for Common Reflection Point Gathers
A common reflection point gather and processing method technology, applied in the field of seismic inversion imaging processing, to achieve the effect of improving signal-to-noise ratio, strong information correlation, and improving overall quality
Active Publication Date: 2018-08-07
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 An Optimal Processing Method for Common Reflection Point Gathers of Collective Quality
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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 polynomial to analyze seismic data (S in cross-correlation objective function) k , S j That is the actual discrete seismic data, the fitting relationship 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)). Fitting to estimate the formation tendency, such as image 3 As shown, it is a schematic diagram of estimating formation tendency by the discrete scanning method of the present invention. In calculating the sliding time window, the local event axis 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 fitted central 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 of fitting...
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The present invention relates to a common reflection point gather optimization processing method. First, the discrete scanning method is used to estimate the stratum dip. In order to make the dip estimation more accurate, a conventional quadratic polynomial is used to fit the seismic data to estimate the stratum dip. In the sliding time window, the median filter is applied in the direction of the center sample event axis, and the filtering result is taken as the output of the final center sample point, that is, the structural median filter. After processing, the signal-to-noise ratio of the gather is improved. A model trace is established on the stacked section, and the residual moveout correction is performed on the common reflection point gather after denoising. Since the stratigraphic dip direction has a stronger information correlation, this method can effectively solve the shortcomings of the traditional method. While improving the overall signal-to-noise ratio of the gather, the remaining time difference is corrected, which is manifested as the leveling of the gather and improving the overall signal-to-noise ratio of the gather. The overall quality of the gather is improved, and the effective signal and formation edge and detail features such as faults and fractures can be well maintained.
Description
Technical field [0001] The invention belongs to the field of seismic inversion imaging processing in seismic exploration data processing, and specifically relates to a common reflection point gather optimization processing method. Background technique [0002] The common reflection point (CRP) gather obtained by pre-stack migration is composed of the reflection information reflecting the same point in the ground. Theoretically, the influence of interface curvature and inclined formation is basically eliminated. The total stack of a series of common reflection point gathers can be obtained Offset profile. For accurate structural imaging, due to the influence of seismic data signal-to-noise ratio, uneven gathers, sub-wave correction and other factors, the superposition of common reflection point gathers cannot obtain ideal imaging results; for pre-stack based on CRP gathers Inversion, higher requirements are placed on the processing of gathers. In addition to improving the signal-...
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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