Rapid VSP ray tracing calculation method for high and steep mountain structure

A technology of ray tracing and calculation method, which is applied in seismic signal processing, seismology for logging records, etc., can solve the problems that the calculation efficiency of ray tracing method cannot meet the needs of production, the amount of calculation is huge, and the surface fluctuation is large. Achieve the effects of stable computing performance, avoiding ray computing, and efficient organization

Pending Publication Date: 2021-10-12
成都爱为贝思科技有限公司
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Problems solved by technology

[0003] In the case of high and steep mountainous and complex geological structures, VSP ray tracing has a relatively special scenario: ① The VSP observation system is deployed on the surface for excitation (well shot or vibroseis), and the geophone is deployed in the well, which is different from ground seismic surface excitation and surface reception; ②High and steep mountain structures usually have large surface undulations, so high and steep mountain VSP ray tracing must be adapted to the ray tracing method for undulating surfaces; ③In VSP processing and imaging applications, more control horizons (40-80 ), at the same time, it is necessary to calculate the reflected rays of each shot det

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  • Rapid VSP ray tracing calculation method for high and steep mountain structure
  • Rapid VSP ray tracing calculation method for high and steep mountain structure
  • Rapid VSP ray tracing calculation method for high and steep mountain structure

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Embodiment Construction

[0052] Due to the existence of high, steep and complex geological structures in the mountains, there are multiple rays between each offset pair. Aiming at the special scene of VSP processing and imaging, the present invention proposes a VSP fast ray tracing technology for complex geological structures in high and steep mountains.

[0053]The basic principle of VSP ray tracing is that the ray starts from the source point and propagates underground along the initial ray direction. According to the known model structure, when the ray encounters the interface, the ray is transmitted according to the Snell theorem, the ray parameters remain unchanged, and the ray direction changes. When When encountering the target interface, the ray is reflected according to the Snell theorem, the ray propagates upward, and ends when the ray reaches the position of the geophone, completing a test launch tracking. Due to the existence of high and steep undulating structures in the mountains, there ...

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Abstract

The invention discloses a rapid VSP ray tracing calculation method for a high and steep mountain structure. The method comprises the following steps: S1, constructing an angle grid with a vertical angle of 0-90 degrees and a horizontal angle of 0-180 degrees; S2, performing trial shooting based on the angle grid: S21, judging a closed block unit where a seismic source point S is located, and acquiring speed and density parameters of the closed block unit; S22, finding out intersected closed block sub-surfaces in the closed block along an initial ray direction, and solving coordinates of an intersection point; S23, determining the next closed block unit into which rays will enter, acquiring the speed and the density of the rays, and determining the direction parameter of transmission rays; and S24, repeating the operation as described in the step S22 and the step S23 until the rays reach receiving ground; and S3, iteratively calculating the rays. According to the method, efficient organization of the rays is realized by utilizing the angle grid, multiple rays of the same offset pair can be calculated by different grids, and high efficiency and accuracy of VSP ray tracing calculation are realized.

Description

technical field [0001] The invention relates to a fast VSP ray tracing calculation method for high and steep mountain structures. Background technique [0002] VSP technology for high and steep mountainous and complex geological structures is one of the important technologies for future oil and gas resource exploration. Due to the complex structure and irregular VSP observation system, the quality and efficiency of VSP velocity modeling and imaging cannot meet the production requirements of well-seismic joint data processing and analysis. On the basis of establishing the initial velocity model, in key processes such as VSP velocity tomography inversion, wave field separation, NMO and imaging, ray tracing can obtain accurate travel time and ray trajectory, which is of great significance in the above key links. [0003] In the case of high and steep mountainous and complex geological structures, VSP ray tracing has a relatively special scenario: ① The VSP observation system i...

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Application Information

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IPC IPC(8): G01V1/28G01V1/42
CPCG01V1/42G01V1/28
Inventor 鲁才陈豪胡光岷
Owner 成都爱为贝思科技有限公司
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