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Calculation method of 3D seismic data stacking velocity based on ellipsoid expansion

A technology of stacking velocity and 3D seismic, applied in the field of exploration geophysics, can solve the problems of ineffective processing of 3D seismic data, achieve the effect of improving data use efficiency and processing accuracy, reducing reflection point dispersion, and improving velocity analysis accuracy

Active Publication Date: 2017-07-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] In order to overcome the deficiency that the existing ellipse velocity analysis method cannot realize the effective processing of 3D seismic data, the present invention proposes a method for calculating stacking velocity of 3D seismic data based on ellipsoid expansion

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  • Calculation method of 3D seismic data stacking velocity based on ellipsoid expansion
  • Calculation method of 3D seismic data stacking velocity based on ellipsoid expansion
  • Calculation method of 3D seismic data stacking velocity based on ellipsoid expansion

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Embodiment Construction

[0023] Such as figure 1 As shown in , the method for calculating stacking velocity of 3D seismic data based on ellipsoid expansion includes the following steps:

[0024] Step 1: Divide the surface elements of the common normal exit point

[0025] Considering the accuracy and resolution requirements of the work area research and referring to the division of the corresponding bins of the CMP point, divide the common normal direction exit point bins in the work area, and determine the position of each bin. The specific method is as follows:

[0026] According to the characteristics of the work area, the resolution and accuracy of the velocity field in the required target area are determined, and the three-dimensional normal exit point panel where each target analysis point is located is calculated to complete the common normal exit point panel division. For the sake of simplicity, the binning of the common normal exit point and the binning of the CMP can be kept consistent.

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Abstract

The invention relates to a method for calculating the stacking velocity of three-dimensional seismic data based on ellipsoid expansion, comprising the following steps: dividing the common normal direction exit point bins in the work area, and determining the position of each bin; taking the location of the bin center as the analysis point , extract the common normal exit point gather at the analysis point; perform ellipsoid expansion and calculate the velocity spectrum based on the three-dimensional relationship equation of the seismic data space and the stacked data space; pick the root mean square velocity from the velocity spectrum; analyze all bins Repeat the above process at each analysis point to obtain the root mean square velocity at each analysis point; by interpolating and extrapolating the root mean square velocity at each analysis point, a superimposed velocity field in the study area is established. The superimposed velocity field obtained by the present invention is accurate and reliable, and can provide a high-precision initial velocity field for the migration velocity analysis method, and the obtained zero-offset superimposed section has complete layers of main reflection events, clear wave group characteristics, and high signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the field of exploration geophysics, and in particular relates to a method for calculating stacking velocity of three-dimensional seismic data based on ellipsoid expansion. Background technique [0002] Geophysical exploration mainly involves two spaces: seismic data space D and geological body space S. Among them, the seismic data space involves the seismic observation system, kinematic characteristics (travel time, etc.), dynamic characteristics (amplitude, frequency, phase, waveform, etc.) and other information; the geological body space describes the geometric shape of the target body, medium elasticity properties, velocity distribution, etc. The general problem of seismic exploration is to obtain the spatial information of geological bodies by studying the spatial information of seismic data. However, the resolution of this problem is complicated by the resolution of the seismic signal. The ellipse expansion method (EDR...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 杜启振李文滨韦亮
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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