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
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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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