Gauss beam prestack depth migration method and device

A Gaussian beam and depth domain technology, applied in the field of petroleum exploration, can solve problems affecting the stability and reliability of imaging results, and achieve the effect of improving accuracy and imaging quality

Active Publication Date: 2014-08-20
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0006] In order to solve the problem of using unreliable rays for migration imaging in the prio...

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  • Gauss beam prestack depth migration method and device
  • Gauss beam prestack depth migration method and device
  • Gauss beam prestack depth migration method and device

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0031] The invention discloses a Gaussian beam prestack depth migration method, such as figure 2 shown, including:

[0032] Step S101, processing the collected seismic wave data to generate time-domain shot seismic record data and determining the velocity interface;

[0033] Step S102, establishing a depth-domain velocity structure model and a velocity grid model;

[0034] Step S103, performing ray tracing on each shot point in the time-domain shot record d...

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Abstract

The invention provides a Gauss beam prestack depth migration method and device. The Gauss beam prestack depth migration method includes the steps that (1), collected seismic wave data are processed to generate time domain shot gather seismic record data and determine a speed interface; (2), a depth domain speed structural model and a speed grid model are built; (3), ray tracing is carried out on the time domain shot gather seismic record data according to the depth domain speed structural model, the speed grid model and the speed interface, and a shot point Gauss beam and a receiver point Gauss beam are generated; (4), the total complex value travel time is determined according to the shot point Gauss beam and the receiver point Gauss beam; (5), saddle points of the total complex value travel time are scanned, and the maximum energy Gauss beam is determined; (6), accumulated imaging is carried out according to the determined Gauss beam with the maximum energy contribution to generate a migration result. The ray tracing in the migration method is carried out by means of the speed grid model and the speed structural model at the same time, so that the accuracy of the ray tracing is improved, and the imaging quality is improved.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to petroleum exploration imaging technology, specifically a Gaussian beam pre-stack depth migration imaging method and device. Background technique [0002] Seismic migration technology is the core technology of seismic data processing. There are two main types of depth migration techniques based on the wave equation: the Kirchhoff integral method and the direct solution of the wave equation. The Kirchhoff integral method regards the underground imaging point as a possible diffraction point, and uses the ray method to calculate the travel time and amplitude from the source point to the imaging point and then to the receiving point under the condition of high frequency approximation, and then according to the calculated travel time and amplitude Stack the seismic data within the aperture. However, the ray-tracing technology used in traditional Kirchhoff integration migration ca...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 梁兼栋王磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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