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Self-adaption interpolating method for real ground-surface ray tracking

A technology of ray tracing and interpolation method, which is applied in the field of oil and gas seismic exploration, and can solve the problems of insignificant practical operation in complex areas, unsuitable for complex structural imaging, and single function of calculation methods.

Active Publication Date: 2012-12-19
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0006] The accuracy and efficiency of 3D seismic ray traveltime calculation have always been difficult to effectively solve in 3D seismic migration imaging
[0007] Although the two-dimensional interpolation method and the three-dimensional linear interpolation method have their own advantages, they are not suitable for complex structure imaging, and the existing calculation methods have single functions, and the practical operation in complex areas is of little significance

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  • Self-adaption interpolating method for real ground-surface ray tracking

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Embodiment Construction

[0018] Embodiments of the invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0019] figure 1 is a flow chart showing the true-surface ray tracing adaptive interpolation method according to the present invention.

[0020] refer to figure 1 , in step 101, divide the space where travel-time ray tracing needs to be performed into spatial grids in the depth domain composed of multiple spatial grids, wherein the side length of each spatial grid may be 5 meters, that is, each A spatial grid is 5m x 5m x 5m. However, the present invention is not limited thereto, and the side lengths of the spatial grid can be set differently according to actual needs.

[0021] In step 102, a ray tracing calculation is performed starting from the real surface to obtain mult...

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Abstract

The invention provides a self-adaption interpolating method for real ground-surface ray tracking. The self-adaption interpolating method includes steps of (a), dividing a space required for travel-time ray tracking into spatial lattice bodies formed by a plurality of spatial lattices; (b) performing ray tracking computation from a real ground surface, and acquiring a plurality of travel-time rays in transmission of earthquake waves; (c) determining the number of travel-time rays penetrating through each spatial lattice; (d) selecting three travel-time rays penetrating through one or more spatial lattices adjacent to the spatial lattices with travel-time rays fewer than the preset number, and constructing a three-dimensional ray pentahedron on the basis of step length of the travel-time rays; (e) performing self-adaption interpolation via travel time of each control point at the six peaks arranged on the ray pentahedron, and accordingly, acquiring a travel-time ray penetrating through the spatial lattices; and (f), repeatedly executing the steps (d) and (e) until the number of the travel-time rays penetrating through the spatial lattices reaches the preset number.

Description

technical field [0001] The invention relates to the field of oil and gas seismic exploration, more specifically, relates to a true surface ray tracing self-adaptive interpolation method in complex mountainous seismic data processing. Background technique [0002] Research on migration imaging methods in complex areas is a frontier research topic that has existed for a long time in petroleum geophysical exploration and has not yet been fully resolved. Among them, the calculation accuracy of ray tracing directly affects the final imaging quality. Therefore, in the heterogeneous medium, the density of rays in different areas of the underground will inevitably be different, and the greater the difference in the medium, the greater the difference in the density of rays. For the area where the rays are sparse, the rays can only be encrypted by means of interpolation, so as to finally realize the offset imaging. Therefore, the precision of interpolation algorithm directly affects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 罗红明何光明陈爱萍曹中林熊晶璇陈三平张华
Owner BC P INC CHINA NAT PETROLEUM CORP
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