Method and system for obtaining ray center coordinate
A ray center and coordinate technology, which is used in the coordinate calculation of regular grid points in the ray center coordinate system, and in the field of Gaussian beam operator calculation. It can solve large errors, low sampling point efficiency, and cannot guarantee efficiency and accuracy at the same time problems, to achieve the effect of improving accuracy and improving image quality
Active Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
When the ray tracing step size is large, the error of this method is large
Moreover, this method needs to traverse all the sampling points of the central ray. When the ray tracing step size is small, there are more sampling points, and the efficiency of traversing all sampling points is low.
In summary, this method cannot guarantee both efficiency and accuracy
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[0043] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0044] Such as Figure 9 As shown, the present invention proposes a method for obtaining the ray center coordinates under the ray center coordinate system under the ray center coordinate system when calculating the Gaussian beam offset operator, and proposes a method for obtaining the ray center coordinates.
[0045] Find the nearest sampling point on the central ray to the grid point based on the circular segmentation method;
[0046] Det...
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The invention provides a method and a system for obtaining a ray center coordinate. The method comprises the steps that a sampling point closest to a grid point on a central ray is found based on a circular segmentation method; the foot point position of the grid point to the central ray is determined; the arc length coordinate and dynamic ray parameters of the sampling point are acquired throughlinear interpolation; and the straight line distance between the foot point position and the grid point is obtained to acquire an n coordinate. The computational efficiency of the method provided by the invention is significantly better than the computational efficiency of a conventional sequential traversal method. According to the method provided by the invention, the precision is improved, andthe imaging quality of Gaussian beam shift is improved.
Description
technical field [0001] The invention belongs to the field of seismic data migration imaging in oil and gas exploration and development, belongs to the content of Gaussian beam operator calculation in Gaussian beam migration, and specifically relates to the calculation of coordinates of regular grid points in a ray center coordinate system. This method can be extended to the calculation of Gaussian beam operators in three-dimensional media, and can be used for large-scale Gaussian beam prestack depth migration processing. Background technique [0002] Gaussian beam migration is an efficient and accurate pre-stack depth migration method, which is widely used in the field of seismic data migration imaging. In the velocity model divided by rectangular grids, when calculating the Gaussian beam offset operator, it is necessary to determine the coordinates (s, n) of the rectangular grid points in the ray center coordinate system. The current commonly used method is on the center ra...
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IPC IPC(8): G01V1/36G01V1/28
CPCG01V1/28G01V1/362G01V2210/512G01V2210/74
Inventor 王守进蔡杰雄倪瑶
Owner CHINA PETROLEUM & CHEM CORP