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Design method of virtual source earthquake observation system

A seismic observation system and design method technology, applied in the field of seismic exploration and development, can solve problems such as false signals and failure to meet theoretical requirements

Active Publication Date: 2014-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

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Problems solved by technology

[0007] It can be seen that the observation method adopted in the virtual source seismic technology cannot meet its theoretical requirements, and will lead to false signals in the process of virtual source construction

Method used

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  • Design method of virtual source earthquake observation system
  • Design method of virtual source earthquake observation system
  • Design method of virtual source earthquake observation system

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Embodiment Construction

[0047] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0048] The principle used by the inventive method is as follows:

[0049] (1) Determination of the maximum allowable source spacing: In order to prevent spatial aliasing, the maximum allowable source spacing Δx max (or Nyquist wavenumber), maximum frequency f max , and the relationship between the slope p in the f-k spectrum should satisfy the following conditions:

[0050] pf max ≤k N or Δ x max ≤ 1 2 pf max - - - ( 2 )

[0051]It can be seen that the maximum allowable source spacing decreases with the increase of the maximum frequency and the maximum slope of the reflected wave event in the relevant gather. The research shows...

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Abstract

The invention provides a design method of a virtual source earthquake observation system, and belongs to the field of earthquake exploration and development. The method comprises the following steps: first of all, estimating a possible maximum source space deltaXmax, then determining a source hole diameter scope Lshot, constructing a correlation channel set by use of different source spaces through numerical simulation, and according to whether false frequencies exist in an f-k spectrum, determining an optimum source space excited on the ground surface, and accordingly obtaining the virtual source earthquake observation system. The method provided by the invention provides a guarantee for obtaining a good virtual source construction result.

Description

technical field [0001] The invention belongs to the field of seismic exploration and development, and in particular relates to a design method of a virtual source seismic observation system. Background technique [0002] The virtual source seismic technology is a new seismic exploration technology proposed for oil and gas exploration and development in complex areas near the surface. image and monitor the lower portion of the overburden. Therefore, this method has a good application prospect in the imaging of high and steep structures in the near-surface complex area and the monitoring of oil and gas reservoirs. [0003] The theory of the virtual source method shows that if a pair of given receivers record the wave field excited by the source located on a closed surface around the two receivers (such as figure 1 As shown, the source is located on a closed surface surrounding two receivers (A and B). ), then, the true impulse response D between these two receivers AB (t) ...

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Application Information

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IPC IPC(8): G01V1/00
Inventor 陈国金曹辉吴永栓张亚红
Owner CHINA PETROLEUM & CHEM CORP