Method for determining incidence angle and amplitude of seismic wave
A technology of incident angle and incident angle, which is applied in the field of geophysical exploration, can solve the problems of fitting value and actual amplitude error, low accuracy of results, and unpreserved amplitude, etc.
Active Publication Date: 2013-07-31
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
First, the straight line method is used to calculate the angle, and then the amplitude with the incident angle (AVA) curve is fitted according to the amplitude coefficient series expression. The biggest shortcoming of this method is that the amplitude is not preserved, and the angle limitation of seismic wave propagation is not considered. , and using the quadratic fitting formula, when the incident angle is too large, there is a large error between the fitted value and the actual amplitude
The simplest angle gather conversion method is to use the input root mean square velocity to calculate the angle stacked profile within the specified angle range by using the straight ray method. This method has the advantages of simplicity, speed, and high signal-to-noise ratio, but it can only The user subjectively specifies a certain angle range for partial superposition, and the accuracy of the result is not high
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[0025] specific implementation plan
[0026] The purpose of the present invention is to provide a method for determining the incident angle and amplitude of seismic waves capable of establishing high-quality angular gathers.
[0027] In the present invention, on the pre-stack common center point gather seismic records, firstly, according to the root mean square velocity field established in the processing process and the known layer velocity field, the ray parameter method is used to establish the accurate correspondence between the incident angle and the offset Then use the distance weighting method to obtain the reflection amplitude intensity at the incident angle of the target, so that the pre-stack common center point gather is converted into the pre-stack common incident angle gather.
[0028] The present invention realizes through following technical scheme:
[0029] 1) Seismic acquisition and processing to obtain amplitude-preserved pre-stack common center point gather...
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The invention relates to a method for determining an incidence angle and an amplitude of a seismic wave in the geophysical prospecting technology. Seismic data are collected and are processed so as to obtain an amplitude-preserving pre-stack common midpoint gather seismic record; an incidence angle is calculated; a reflection wave amplitude intensity value of an incidence angle corresponded to a shot-to-receiver distance is obtained; in an around small angle range taking a target incidence angle as a center, a distance inverse proportion of the angle is used as a weighted factor to carry out weighted stacking, so that a reflection amplitude intensity of the target incidence angle is obtained; and thus, the pre-stack common midpoint gather seismic record is converted into a high quality angle gather. According to the invention, an incidence angle and an amplitude of a seismic wave can be accurately determined; a pre-stack common midpoint gather seismic record is converted into a high quality angle gather; and data guarantee is provided for subsequent seismic inversion with amplitude variation with offset distances and an analysis on the amplitude variation with offset distances.
Description
technical field [0001] The invention relates to geophysical prospecting technology, belongs to the technical category of determining angle gathers in the process of seismic data processing, and is a method for determining the incident angle and amplitude of seismic waves. Background technique [0002] In seismic exploration, seismic waves excited on the surface propagate deep into the formation at a certain angle and amplitude. The angle of propagation varies with the velocity of the formation, and the amplitude also varies with the incidence angle, velocity and density of the formation, and its variation law conforms to the Zoeppritz formula. The purpose of seismic exploration is to determine the accurate petrophysical parameters of underground formations and their changing laws. If the incident angle of the collected seismic data and the variation of the amplitude of the reflected wave at different incident angles at the same reflection point are determined, and then comb...
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IPC IPC(8): G01V1/28G01V1/32
Inventor 赵剑张红英詹世凡罗国安陈亚军
Owner BC P INC CHINA NAT PETROLEUM CORP