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A joint static correction method based on surface shear wave velocity inversion

A shear wave velocity and static correction technology, which is applied in the field of seismic exploration or surveying, can solve the problems of difficulty in picking up converted refracted waves, uncertainty in picking up reflected waves, and difficulty in calculating static corrections, so as to solve inaccurate static corrections and improve accuracy. , Improve the effect of imaging level

Active Publication Date: 2018-02-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] In addition, the method of using converted refracted waves and reflected waves to correct converted wave statics proposed by Yao Yao et al. has also achieved certain results, but because the converted refracted wave is a continuous arrival wave rather than a first arrival wave, it is difficult to pick up and there are problems when picking up reflected waves. Uncertainty makes it difficult to calculate static correction

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  • A joint static correction method based on surface shear wave velocity inversion
  • A joint static correction method based on surface shear wave velocity inversion
  • A joint static correction method based on surface shear wave velocity inversion

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[0065] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0066] As a composite wave of body P-wave and S-wave, the velocity of Rayleigh surface wave is related to the velocity of P-wave and S-wave, so the near-surface S-wave velocity structure can be inverted by Rayleigh surface wave. As a common noise in land seismic exploration, Rayleigh waves have always been suppressed as strong linear interference. If the static correction of the converted wave can be realized by using the extracted surface wave, it is equivalent to "turning waste into treasure".

[0067] A combined static correction method based on surface shear wave velocity inversion, comprising the following steps:

[0068] Step 1: High-precision interpolation of the wave field

[0069] In seismic exploration, ...

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Abstract

The present invention relates to a combined longitudinal and transverse wave static correction method based on surface shear wave velocity inversion. The method uses high-precision wave field interpolation, combined application of longitudinal wave and converted wave data surface wave information, and through weighted superposition, effectively improves the direct inversion The accuracy of shear-wave velocity calculation effectively solves the problem of inaccurate static correction through the indirect calculation of shear-wave static correction by conventional methods, thus effectively improving the imaging level of multi-wave data. Through the application test of three-component seismic data processing in Luojia area of ​​Shengli Oilfield, a good processing effect has been achieved, which proves that the combined compression and shear wave static correction method based on surface shear wave velocity inversion is a feasible method.

Description

technical field [0001] The invention relates to the field of seismic prospecting or surveying, in particular to a combined static correction method based on surface shear wave velocity inversion. Background technique [0002] Due to the undulations of the terrain or the presence of horizontal velocity inhomogeneities in the shallow layer, the reflected seismic signals reaching the surface will not only have the normal time difference caused by the normal offset and depth changes on different geophones, but also appear due to the surface The change of travel time caused by the abnormality of the shallow low and deceleration zone. This change in travel time must be eliminated in the processing of the reflected wave signal in order to obtain normal imaging of the subsurface medium. The correction of this time difference is called static correction in the field of artificial seismic signal processing. [0003] Static correction is generally divided into two categories: one met...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 王延光韩世春石建新林松辉王高成武小杰赵茂强刘丽媛
Owner CHINA PETROLEUM & CHEM CORP
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