Prestack migration method of two-dimensional Gaussian ray bundle

Abstract

The invention relates to geophysical exploration, in particular to a prestack migration technology of a two-dimensional Gaussian ray bundle. The technology comprises the following steps of: performing integral transformation on track data and Hilbert transformation data obtained by processing seismic data of each track in a shot gather to obtain a discrete template table; calculating the shot point ray path and travel time of a given shot point ray angle; calculating the Gaussian ray bundle kinetic parameter of the shot point according to the travel time by using a Gaussian ray bundle kineticequation; tracking a ray according to a time interval by using the kinetic equation; calculating the ray path, travel time and a Gaussian ray bundle kinetic parameter of a demodulator probe; and laminating a migration result and displaying a stratum section image. By adopting the technology, migration is performed by the Gaussian ray bundle instead of a Kirchhoff ray, so that the problems of blind area, caustic region and multi-value travel time of the ray are solved, an imaging effect is enhanced, and the advantages of flexibility and high efficiency of a ray method are kept simultaneously.

Description

technical field [0001] The invention relates to geophysical exploration technology, belongs to the category of pre-stack migration processing technology of seismic data, and is a kind of two-way method to realize the spatial homing of reflection interface, restore the characteristics of reflection wave field, and improve the seismic horizontal resolution and seismic signal fidelity. A method for prestack migration of dimensional Gaussian ray beams. Background technique [0002] In the field of pre-stack migration processing technology for geophysical exploration seismic data, the migration processing methods widely used in the industry can be divided into two categories: the Kirchhoff ray method based on the integral solution of the wave equation and the direct solution of the wave equation. Among them, the advantage of the Kirchhoff ray method is that the calculation speed is fast, it can be applied to the reflection interface with any inclination angle, and it has a strong...

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Problems solved by technology

Among them, the advantage of the Kirchhoff ray method is that the calculation speed is fast, it can be applied to the reflection interface with any inclination angle, and it has a strong adaptability to complex observation systems; the disadvantage is that due to the high-frequency approximation, the Kirchhoff method has a weak processing ability for complex structures , especially in the processing of multi-valued travel time, so the imaging quality is not ideal under the conditions of large horizontal and vertical velocity changes and complex structural shapes.

The direct solution of the wave equation improves the accuracy of migration imaging and overcomes the weak ability of the Kirchhoff ray method to image complex structures. However, due to the huge workload of directly solving the wave equation, the computational efficiency of this method is much lower than that of the Kirchhoff method.

[0003] Compared with the Kirchhoff and wave equation methods, the Kirchhoff method has an advantage in calculation efficiency, while the direct solution of the wave equation is better in effect, but there is no more reasonable balance between calculation efficiency and accuracy, which makes the actual migration process always have shortcomings

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