Converted-wave dynamic correcting method and system for longitudinal-wave constraint scanning
A technology of converted wave and dynamic correction, which is applied in the field of seismic exploration, can solve the problem of large offset dynamic correction inequality, and achieve the effect of solving large offset dynamic correction unevenness
Active Publication Date: 2014-12-17
BC P INC CHINA NAT PETROLEUM CORP +1
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[0014] In order to overcome the problems of uneven correction and upturning of large offsets in the conversion fluctuation correction scheme in the prior art when the offset is large, the present invention provides a conversion fluctuation correction method and system for longitudinal wave constrained scanning. The data scans the offset distance and the position of the conversion point, and obtains the dynamic correction time difference by scanning different offsets corresponding to different travel times within the full offset range, and dynamically corrects the conversion wave according to the dynamic correction time difference, realizing the accurate solution of the conversion wave The dynamic correction time difference can solve the problem of large offset dynamic correction existing in the existing conversion fluctuation correction, and realize the extraction of the conversion wave common conversion point gather
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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0035] The formulas (1) to (4) in the prior art are all based on the idea of the formulas to simulate the time-distance curve of the converted wave, which is a way of processing the converted wave starting from the converted wave itself. In addition to the converted wave, the longitudinal wave is usually acquired along with the converted wave, and the longitudinal wave is a conventionally obtained wave, and the processing method is mature and the result is ac...
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The invention provides a converted-wave dynamic correcting method and system for longitudinal-wave constraint scanning. The converted-wave dynamic correcting method includes acquiring longitudinal-wave data and converted-wave data; acquiring preset step length and a first incidence angle; determining a plurality of initial incidence angles according to the step length and the first incidence angle; determining offset and travel time corresponding to each initial incidence angle according to the longitudinal-wave data, the converted-wave data and the initial incidence angles; determining dynamic correction time difference according to the offset and the travel time corresponding to each initial incidence angle; subjecting the converted-wave data to dynamic correction according to the time difference of the dynamic correction. Dynamic-correction time difference of converted waves is solved accurately, the problem that dynamic correction of large offsets is uneven in existing converted-wave dynamic correction is solved, and extraction of gather of common conversion points of the converted waves is realized.
Description
technical field [0001] The present invention relates to the technical field of seismic exploration, in particular to the exploration and processing technology of converted waves, and specifically to a conversion fluctuation correction method and system for longitudinal wave constrained scanning. Background technique [0002] At present, the motion correction of converted waves has always been a difficult problem in converted wave processing technology, because the time-distance curve of converted waves is not a hyperbola. The time-distance curve equation of longitudinal wave can be expressed as: [0003] t p = 1 v p 4 z 2 + 4 h 2 = t p 0 ...
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IPC IPC(8): G01V1/36
Inventor 贺照权
Owner BC P INC CHINA NAT PETROLEUM CORP