VSP (vertical seismic profiling) wave field separation method
A wave field separation and reflection wave technology, which is applied in seismic signal processing and other directions, can solve the problems of residual energy, incomplete separation of waves, and poor separation effect, so as to achieve optimal separation and overcome the effect of incomplete separation of wave fields
Active Publication Date: 2014-08-27
SHANGHAI JINDI SOFTWARE DEV
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Problems solved by technology
The calculation of the polarization angle of the traditional polarization filtering method is based on the propagation direction of the direct wave. Therefore, due to the influence of the observation angle, in addition to the orthogonal direction, the waves in other directions cannot be completely separated, especially the uplink P-P reflection wave, Uplink P-SV reflection waves, etc., there is residual energy, and the separation effect is poor
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[0020] The present invention will be further described below in conjunction with the accompanying drawings.
[0021] Such as figure 1 The schematic diagram of the three-component VSP observation is shown. The traditional method is based on the Cartesian coordinate system and uses the polarization angle of the direct wave to separate the wave field;
[0022] Assuming that the direct P wave transmitted from the P wave source to the first depth point in the well has the same particle motion direction as the wave propagation direction, and both are in the plane determined by the source and the well, then the polarization direction of the direct P wave is linear, and its projection on the horizontal plane is also a straight line.
[0023] The specific method process is:
[0024] (A) Using the projection of the direct wave polarization direction in the horizontal plane as a reference, measure the relative orientation of the horizontal component when the three-component detector ob...
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The invention relates to a seismic data processing technique, and particularly relates to the field of affine coordinate system-based VSP (vertical seismic profiling) data wave field separation processing. The method specifically comprises the following steps of: (A) carrying out synthesis on components x and y in a horizontal direction; (B) separating wave fields of P waves and SV waves in a horizontal component x' direction and a vertical component z direction; and (C) assuming the polarizing angles alpha (H) of an upcoming P-P wave and an upcoming P-SV wave with different depths H in a new coordinate system. Compared with the prior art, according to the method disclosed by the invention, for any underground reflection point, an affine coordinate system can be established according to the direction of upcoming reflection waves of the point so as to carry out wave field separation, and the coordinate systems for different points are different. By using the method disclosed by the invention, a defect that a wave field can not be completely separated by using the traditional rectangular coordinate system is overcome; and completely based on a required wave field, the optimal separation of the wave field can be realized.
Description
[technical field] [0001] The invention relates to a seismic data processing technology, in particular to the field of wave field separation processing of VSP data based on an affine coordinate system. [Background technique] [0002] The wave fields received by VSP data are very rich, including direct wave, uplink P-P wave, downlink P-P wave, uplink P-SV wave, downlink P-SV wave and other wave fields. These wave fields can be completely recorded by the three-component detector. But how to separate them becomes the key to VSP data processing. Usually the most effective method is three-component polarization filtering to realize the preliminary separation of the wave field. The calculation of the polarization angle of the traditional polarization filtering method is based on the propagation direction of the direct wave. Therefore, due to the influence of the observation angle, in addition to the orthogonal direction, the waves in other directions cannot be completely separated...
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IPC IPC(8): G01V1/28
Inventor 初少林
Owner SHANGHAI JINDI SOFTWARE DEV