Mountainous area seismic data statics calculation method based on floating datum plane
A technology of static correction and seismic data, applied in the field of static correction processing of seismic data, can solve problems such as inaccurate calculation of static correction, and achieve high reliability, easy implementation, and simple calculation
Active Publication Date: 2020-12-18
OCEAN UNIV OF CHINA
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[0004] In view of the above-mentioned defects in the prior art, the present invention proposes a method for calculating the static correction of seismic data in mountainous areas based on floating datums, which solves the problem of inaccurate calculation of the static correction in the existing method in areas with complex near-surface conditions
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Embodiment 1
[0084] In the following, the theoretical model test of the present invention will be explained and described in conjunction with specific implementation methods.
[0085] In order to further illustrate the realization idea and implementation process of this method and prove the effectiveness of the method, a near-surface velocity model of a two-layer medium with severe surface fluctuations is used for testing, and the short-wavelength static correction value is obtained by fitting the first arrival travel time method for comparison.
[0086] S1: A near-surface velocity model of a two-layer medium is used as the true velocity model. In the real velocity model, the surface undulates violently, and the velocity varies laterally (see figure 2 ). The true velocity model has a width of 10,000 m and a depth of 700 m. A square grid with a side length of 5 m is used to discretize the true velocity model.
[0087] S2: Observation system: 50 shot points and 250 receiver points are e...
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The invention relates to a mountainous area seismic data statics calculation method based on a floating datum plane, and belongs to the technical field of seismic data static correction processing. The method comprises the following steps: acquiring first arrival travel time data and a near-surface velocity model; calculating a weathered layer bottom interface and a floating reference surface; calculating the vertical travel time of the seismic wave propagating from the floating reference surface to the weathered layer bottom interface; calculating the residual travel time of the seismic wave;selecting a minimum offset distance and a reference point; calculating delay time between adjacent detection points; calculating delay time between adjacent shot points; calculating delay time from the detection point and the shot point to the reference point; calculating statics of the shot point end and the detection point end; and outputting the calculated statics. According to the method, theinfluence of inaccurate medium speed estimation above the floating reference surface on statics calculation is solved, and the use of near-offset first arrival travel time data for calculating the statics is avoided.
Description
technical field [0001] The invention relates to a method for calculating the static correction amount of mountainous seismic data based on a floating reference plane, and belongs to the technical field of seismic data static correction processing. Background technique [0002] In areas with complex near-surface conditions, the problem of static correction is very prominent. The effect of static correction directly affects the quality of the final stacked section. The existing static correction calculation method uses the velocity change of the medium above the bottom interface of the regolith in the inverted near-surface velocity model and the influence of surface fluctuations on the travel time of seismic waves as the long-wavelength static correction, and then uses the remaining travel time to calculate the short-wavelength static correction. [0003] In mountainous areas where the surface elevation changes drastically, the velocity of the shallow formation near the surf...
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IPC IPC(8): G01V1/36
CPCG01V1/362G01V2210/53
Inventor 张建中杨华臣任凯
Owner OCEAN UNIV OF CHINA