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Three-dimensional integral prestack depth migration method

A pre-stack depth migration, maximum energy technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as the lack of seismic imaging, and achieve the effect of small amount of calculation and flexible imaging

Inactive Publication Date: 2007-08-22
匡斌
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AI Technical Summary

Problems solved by technology

Although the seismic wave first arrival travel time method is computationally efficient, in many complex geological structures, accurate seismic imaging cannot be obtained using the seismic wave first arrival travel time

Method used

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  • Three-dimensional integral prestack depth migration method
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  • Three-dimensional integral prestack depth migration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] 1. Theoretical model test example:

[0038] Data situation: The SEG / EAGE salt dome model is used for testing, which is a theoretical geological model commonly used internationally to test the effects of complex structure imaging and other 3D processing techniques. This test selects the narrow azimuth data of data C. The data size is 6 G, 1 shot and 8 lines streamer observation, the recording length is 5 seconds, the sampling is 8 milliseconds, and each channel has 625 samples.

[0039] Calculation parameters of travel time and amplitude: the theoretical source is excited on the surface, and the following parameters are selected according to the data and structural conditions: a total of 84 shot lines are calculated, each line has 84 shots, the shot spacing and line spacing are both 160 meters, and the grid of each shot: Nx , Ny, Nz are 241, 241, 120 respectively, Dx, Dy, Dz are all 40 meters.

[0040] Prestack depth migration parameters: 3D prestack depth migration ca...

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Abstract

The invention relates to pre-fold depth excursion technology in the data processing of the oil and earthquake exploration. It includes: setting up the depth speed module for the pro-fold earthquake data; designing the observation grating to solve the wave equation which modulates the propagating process of the earthquake wave in the ball coordinate system; the earthquake wave field switch with computed the frequency field is changed to the time field, then to fit the earthquake wave field Green function energy spectrum and get the reaching time and the swing of the max energy; transforming the travel time and the swing field computed in the ball coordinate system to the orthogonal coordinate system; according to the travel time and the swing to get the max energy integral pro-fold depth excursion; analyzing the speed of the image path collection to modify the depth speed module; by iteration to modify the module until the excursion result fit for the precision. The invention provides the self adaptive switch difference grating computing technology to make the difference grating change thin along with the radius, so the limit difference computing precision can be assured.

Description

Technical field: [0001] This technology relates to the pre-stack depth migration technology in the process of petroleum seismic exploration data processing, specifically a method that uses wave field extrapolation technology to calculate the travel time and amplitude of seismic waves to improve the accuracy of pre-stack depth migration of the three-dimensional integration method. Background technique: [0002] The core of Kirchhoff integration prestack depth migration is the calculation of seismic wave travel time in complex media. At present, the commonly used travel time calculation methods at home and abroad are basically based on the echelon-function equation to calculate the first arrival time of seismic waves. Although the seismic first arrival travel time method has high calculation efficiency, in many complex geological structures, accurate seismic imaging cannot be obtained by using the first seismic wave travel time. Invention content: [0003] The purpose of the...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36G06F17/00
Inventor 匡斌
Owner 匡斌
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