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Tridimensional integral prestack depth migration method based on maximum energy travel calculation

A technology of pre-stack depth migration and maximum energy, which is used in seismology and seismic signal processing for logging records, and can solve problems such as lack of seismic imaging.

Inactive Publication Date: 2009-09-30
匡斌
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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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  • Tridimensional integral prestack depth migration method based on maximum energy travel calculation
  • Tridimensional integral prestack depth migration method based on maximum energy travel calculation
  • Tridimensional integral prestack depth migration method based on maximum energy travel calculation

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Experimental program
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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 the prestack depth migration technique during the data processing of petroleum seismic prospecting, including the following concrete steps: establishing depth rate pattern of prestack seismic data; well designing observation grids, and solving wave equation in sphere coordinate system to simulate the communication process of seismic waves; changing and converting the calculated seismic wave field of a frequency domain into a time domain, and fitting the Green function energy spectrum of the seismic wave field in the time domain to detect the arriving time and the vibration amplitude when the maximum energy arrives; transferring the travel time and the vibration amplitude field calculated in the sphere coordinate system to a rectangular coordinate system; accomplishing the maximum energy integral prestack depth migration according to the well calculated travel time and the vibration amplitude; analyzing the operation of speed to the imaging gather of the prestack depth migration to modify the depth rate pattern; and modifying the depth rate pattern by iteration, and outputting the ultimate result until the migration result meets the precision requirement. The invention provides the self-adapting variation difference grid calculation technique so as to achieve the purpose that the difference grids are automatically and gradually thinned along with radius increase, thereby guaranteeing the finite difference calculation precision.

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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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36G01V1/32G01V1/40
Inventor 匡斌
Owner 匡斌
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