VSP initial velocity modeling method and device

A technology of initial velocity and modeling method, applied in the field of seismic exploration data processing, can solve the problems of uneven coverage of the observation system and small imaging aperture, and achieve the effect of improving the velocity modeling ability and high practicability

Active Publication Date: 2018-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

However, the VSP technology has the problems of uneven cov

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  • VSP initial velocity modeling method and device
  • VSP initial velocity modeling method and device

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Embodiment 1

[0030] figure 1 A flow chart of a VSP initial velocity modeling method according to an embodiment of the present invention is shown. The method may specifically include:

[0031] Step 101: Picking the first arrival time of the seismic wave on the VSP data.

[0032] In VSP technology, the first arrival time of seismic wave is the key to calculate the average velocity and layer velocity, so the picking of first arrival time of seismic wave from shot point to receiver point is very important. The existing first-arrival picking methods mainly include time-window seismic feature method, correlation method, data image processing method, ejaculation network algorithm and so on. Those skilled in the art should understand that any appropriate method can be used to pick up the first arrival time of the seismic wave on the VSP data.

[0033] Step 102: Invert discrete velocity values ​​based on the first arrival time of the seismic wave.

[0034] In one example, discrete velocity valu...

Embodiment 2

[0062] According to another embodiment of the present invention, a VSP initial velocity modeling device is provided. The device may include: a unit for picking up the first arrival time of the seismic wave on the VSP data; a unit for inverting discrete velocity values ​​based on the first arrival time of the seismic wave; a unit for obtaining a seismic migration profile based on ground seismic data; and means for interpolating the discrete velocity values ​​using the seismic migration profile as a guide to build a velocity model.

[0063] In an example, inverting the discrete velocity value based on the first arrival time of the seismic wave may include: inverting the discrete velocity value using a layer-by-layer recurrence method.

[0064] In one example, using the seismic migration profile as a guide to perform velocity interpolation to establish a velocity model may include the following steps: based on the tensor field D(x) of the seismic migration profile, the distance b...

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Abstract

The invention discloses a VSP initial velocity modeling method and device. The VSP initial velocity modeling method comprises following steps of picking up seismic wave first arrival time from VSP data; inverting discrete velocity values based on the seismic wave first arrival time; obtaining a seismic migration section based on ground seismic data; carrying out interpolation on the discrete velocity values by taking the seismic migration section as the guide in order to establish a velocity model. With respect to the VSP initial velocity modeling method and device, by combining the VSP and the ground seismic data, the VSP initial velocity is modeled relatively accurately.

Description

technical field [0001] The invention relates to the field of seismic exploration data processing methods, and more specifically, to a VSP initial velocity modeling method and a VSP initial velocity modeling device. Background technique [0002] VSP is the abbreviation of Vertical Seismic Profile, that is, the vertical seismic profile, which corresponds to the horizontal seismic profile observed on the ground. The big difference between VSP technology and ground seismic technology is that ground seismic technology places both the source and receiver on the ground, so in addition to receiving the direct wave and surface wave propagating along the surface, it can only receive waves from the underground interface. The upgoing wave; and the VSP technology, because the detector is placed inside the formation, it can receive both upgoing waves and downgoing waves. Compared with surface seismic technology, VSP technology has many advantages, most of which come from the observation ...

Claims

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Application Information

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IPC IPC(8): G01V1/30
Inventor 李栋刘定进徐兆涛
Owner CHINA PETROLEUM & CHEM CORP
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