Method for calculating high-accuracy seismic wave velocity by utilizing stacking velocity
A technology of superimposing velocity and seismic waves, applied in the field of geophysical exploration, can solve the problems of error, complex surface, non-wavy quality, etc., and achieve the effect of eliminating errors.
Active Publication Date: 2014-10-29
夏正元
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Problems solved by technology
For an ideal layered medium, this relationship is valid, but in actual seismic exploration, the surface is complex, and the underground stratum also has local changes and is non-massive, so there will be many errors
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Embodiment 1
[0039] The seismic wave velocity at the B1 well point obtained by the present invention is centered on the well point, and the 20 stacked velocity spectra in the bin are used as the basic data, and the average velocity obtained is compared with the average seismic velocity measured by the VSP of the B1 well ( image 3 ), the measured error with VSP is less than 10 meters, indicating that the accuracy is very high.
Embodiment 2
[0041] With the A1 well point seismic velocity obtained by the present invention, take this well point as the center, use 14 stacked velocity spectra in the bin as basic data, the average velocity obtained is compared with the seismic average velocity measured by A1 well VSP ( Figure 4 ), and the measured error with VSP is about 10 meters, indicating that the accuracy is very high.
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The invention provides a method for calculating the high-accuracy seismic wave velocity by utilizing the stacking velocity in a geophysical prospecting technology, proposes that a datum plane, inaccurate static correction, local change of formation lithology and thickness, an offset distance and the like in an area with earth's surface and underground geological conditions influence the stacking velocity, and establishes relation between the stacking velocity of complex areas and root-mean-square velocity. The method comprises the following steps of 1 calculating the stacking velocity of the datum plane under the near surface condition; 2 utilizing average of the stacking velocity or the stacking layer velocity in a limited surface element to eliminate the influence of the inaccurate static correction and formation anisotropism; 3 adopting layered velocity model time distance curve forward modeling to estimate an offset distance forming stacking velocity error. A depth error is within 10 meters through multiple-port VSP well logging inspection, a calculation result is reliable, and the accuracy is high.
Description
technical field [0001] The invention relates to geophysical exploration technology, belongs to the technical category of seismic data processing and interpretation, and is a method for obtaining high-precision seismic wave velocity by using stacking velocity technical background [0002] In seismic exploration, seismic wave velocity is a very important parameter, especially seismic data processing, seismic data interpretation, migration imaging, AVO oil and gas detection, etc. all require seismic wave velocity parameters. In seismic data processing, a large amount of velocity spectrum data is obtained. The stacking velocity explained by the processor is mainly used for dynamic correction, which can level the reflected wave event of the CMP gather, but when using it to calculate the seismic wave velocity, it is different from the VSP measurement. The calibration results of the well and seismic synthetic records have large errors; the adjacent stacking velocities also vary gre...
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IPC IPC(8): G01V1/28
Inventor 夏正元夏艺苟堡铭王润生畅永刚崔晓杰
Owner 夏正元
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