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Time delay vibration source combined parameter calculating method for protecting excitation frequency

A technology of parameter calculation and excitation frequency, which is applied in the field of petroleum exploration, can solve the problems of less use of delay excitation, no consideration of the influence of combination frequency, and less consideration, so as to achieve the effect of improving the signal-to-noise ratio

Inactive Publication Date: 2019-03-29
中石化石油工程技术服务有限公司
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Problems solved by technology

[0007] 1. There is no quantitative method to evaluate the pros and cons of a combination. The quality of a combination is completely determined by comparing the effects after testing various combinations;
[0008] 2. The influence of the combination on the frequency is not considered;
[0009] 3. Less consideration is given to changes in combination depth;
[0010] 4. Delayed excitation is rarely used

Method used

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  • Time delay vibration source combined parameter calculating method for protecting excitation frequency
  • Time delay vibration source combined parameter calculating method for protecting excitation frequency
  • Time delay vibration source combined parameter calculating method for protecting excitation frequency

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Embodiment 1

[0075] The calculation process involved in this embodiment is implemented by C++.

[0076] Such as Figure 5 As shown, the method for calculating the time-delay seismic source combination parameters of the protection excitation frequency of the present embodiment includes the following steps:

[0077] Step (1), according to the actual situation of the work area, establish a three-dimensional geological model;

[0078] Step (2), based on the three-dimensional geological model, determine the combination center to be optimized, and arrange a certain number of seismic sources around the center on the nodes of the geological grid. Set the combined center coordinates (0,0,0), and later need to optimize calculations in the range of X∈[-10m~10m], Y∈[-10m~10m], Z∈[-10m~10m], geological network If the grid interval is 1m, 11*11*11 seismic sources need to be arranged around the composite center;

[0079] Such as Figure 8 As shown, in this embodiment, (0,0,0) is used as the combined ...

Embodiment 2

[0116] In the method for calculating the combination parameters of time-delay seismic sources for protecting the excitation frequency in this embodiment, in step (6), a greedy algorithm is used to optimize the combination parameters.

[0117] The greedy algorithm can guarantee to find the global optimal solution but the calculation speed is slow. The calculation time of the particle swarm optimization algorithm is controllable, but it cannot guarantee to find the global optimal solution. If the empirical value close to the optimal solution is given as the initial input, the calculation effect is better .

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Abstract

The invention relates to a time delay vibration source combined parameter calculating method for protecting an excitation frequency. The method comprises the steps of establishing a geological model,laying a vibration source at a coordinate position which may be used in later optimization, laying detectors on a sphere surface in which a lowest target layer depth is used as a radius and a combinedcenter is used as a sphere center, and finishing single-shot forward modeling of all vibration sources; then based on a preset number of combinations and a combination form through a number optimizing algorithm or a greedy algorithm, wherein the calculation process requires satisfaction of a preset main frequency restraining condition. The method overcomes some defects in design of current vibration source combined parameter and realizes a quick combined parameter quantitative method. Furthermore the time delay vibration source combined parameter calculating method has high operability and can supply plan guidance for field construction.

Description

technical field [0001] The invention relates to a calculation method for a time-delay seismic source combination parameter, in particular to a calculation method for a time-delay seismic source combination parameter for protecting an excitation frequency, and belongs to the field of petroleum exploration. Background technique [0002] In my country's land seismic exploration, explosive sources are still frequently used energy sources. The explosive source can be regarded as a point source. In a homogeneous medium, the energy excited by the source spreads evenly around. The wave front is a spherical surface. In a non-uniform medium, there is additional reflection of the wave. The propagating wave field is complex, and the energy distribution is related to the structure of the medium. Regardless of whether the subsurface medium is uniform or not, one thing is certain, that is, the reflected energy received by seismic exploration is only a small part of the excitation energy of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/02G01V13/00
CPCG01V1/02G01V13/00
Inventor 刘传山陈明春尹以东谭勇韦相宁
Owner 中石化石油工程技术服务有限公司
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