Ellipse Expansion Converted Wave Velocity Analysis Method and System
A technique of velocity analysis and ellipse expansion, applied in seismic signal processing and other directions, can solve problems such as inability to effectively form common conversion point gathers, inability to correlate and unify, lack of dip angle and velocity, etc., and achieve the effect of solving the problem of accurate calibration
Active Publication Date: 2019-09-03
新锦动力集团股份有限公司
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Problems solved by technology
The process is complicated, and the relevant formulas are approximate formulas, which are complex and inaccurate, and the common conversion points are prone to dispersion and shifting
[0026] When the underground reflection interface is of arbitrary shape and the surface has large fluctuations, the asymmetric sorting technique of the offset pair cannot effectively form the common conversion point gather
Due to the lack of information on inclination and velocity, no superimposed signal can be formed at the co-conversion point
In addition, the accurate information of the longitudinal wave and converted wave velocity ratio γ cannot be obtained, and the reflection interface of the PP wave profile and the PS wave profile cannot be correlated and unified.
Method used
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[0078] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0079] Such as figure 2 As shown, an embodiment of the present invention provides an ellipse expansion converted wave velocity analysis method, comprising the following steps:
[0080] Step S1, obtaining a common shot point gather, and establishing an observation system according to the common shot point gather data; preferably, in the observation system, the shot point is placed at the coordinate origin.
[0081] Step S2, on the basis of the observation system established in the step S1, the velocity analysis formula of the co...
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The invention provides an elliptical expansion converted wave velocity analysis method and system. The method includes the following steps that: a common shot point gather is obtained, and an observation system is established according to common shot point gather data; and converted wave velocity analysis is performed through using a converted wave velocity analysis equation, so that converted wave velocity and corresponding longitudinal wave velocity are obtained directly. According to a traditional converted wave processing technology, approximate processing is required to be performed on a common-conversion point gather at first, and then, velocity analysis can be performed, and as a result, a plurality of defects can be brought about, while, with the method and system of the invention adopted, a process is simple, and an approximation formula can be omitted; when an underground reflection interface has an arbitrary shape, the method of the present invention can be used to effectively form a common conversion point superposition profile; and by means of a velocity analysis result, the reflection interface of a PP wave profile and a PS wave profile can be correlated and unified.
Description
technical field [0001] The invention relates to the technical field of seismic data processing, in particular to an ellipse expansion converted wave velocity analysis method and system. Background technique [0002] The idea of developing converted wave seismic techniques arose in the second half of the 20th century. Due to the use of this technology, a higher resolution time section can be obtained during seismic data processing, and the velocity of longitudinal wave and shear wave and its ratio can be obtained, which can be used to study the lithology and stress state of the geological section and carry out lithofacies analysis, and seismic field acquisition The increase in investment is not large, so people once placed high hopes on this technology. But at present the main seismic work is done by studying a single longitudinal wave, and only a small part of seismic exploration uses converted wave, but it is only limited to the area where the seismic reflection layer is...
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IPC IPC(8): G01V1/30
Inventor 周青春康德拉什科夫田迎春张云波谢桂生姜瑞友陈相君涂国田赵正三
Owner 新锦动力集团股份有限公司