Surface layer quality factor Q value determination method and device
A technology of quality factor and surface, which is applied in the field of petroleum seismic exploration data processing, can solve the problems of low precision of surface quality factor Q value, affecting the calculation accuracy of Q value, affecting the calculation of Q value, etc.
Pending Publication Date: 2021-02-26
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
The near-field component will produce an apparent attenuation of the same dimension as the intrinsic attenuation, which seriously affects the calculation of the Q value; ④ the influence of interference waves; interference waves such as surface waves, shallow refracted waves, and ghost reflections interfere with direct waves (transmitted waves), affecting Q value calculation accuracy
Therefore, the accuracy of determining the surface quality factor Q value in the prior art is not high
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[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0040] The embodiment of the present invention provides a method for determining the Q value of the surface quality factor to improve the accuracy of the Q value of the surface quality factor, such as figure 1 As shown, the method includes:
[0041] Step 101: Obtain micro-logging data of the target area; wherein, the micro-logging data includes micro-logging collection records;
[0042] Step 102: Establish a surface horizontal layered geological...
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The invention provides a surface layer quality factor Q value determination method and device. The surface layer quality factor Q value determination method comprises the steps of: building a surfacelayer horizontal stratified geological model according to the micro-logging data of a target region; correcting a low-speed layer stratum speed of the surface layer horizontal stratified geological model to obtain a corrected surface layer horizontal stratified geological model; acquiring a forward direct wave record on the corrected surface layer horizontal stratified geological model by using aray tracing method; according to the forward direct wave record, identifying the position of a direct wave on a micro-logging acquisition record, and removing seismic traces of first arrival wave indirect waves on the micro-logging acquisition record; eliminating interference waves through frequency wave number domain filtering to obtain a filtered micro-logging record; and determining a surface layer quality factor Q value of a target region according to the filtered micro-logging record. By removing seismic traces of first arrival wave indirect waves, interference waves are removed through frequency wavenumber domain filtering, the influence of the interference waves on the Q value calculation precision is reduced, and therefore the precision of the surface layer quality factor Q value is improved.
Description
technical field [0001] The invention relates to the technical field of petroleum seismic exploration data processing, in particular to a method and device for determining the Q value of a surface quality factor. Background technique [0002] When the seismic wave propagates in the formation, the energy of the seismic wave is absorbed by the medium, resulting in the attenuation and dispersion of the seismic wave. The quality factor Q is a basic parameter to describe the absorption and attenuation characteristics of the formation, and it is of great significance to improve the resolution of seismic data. Quality factor Q can be calculated from laboratory, surface seismic, VSP, crosswell seismic data and microlog data. The calculation methods of quality factor Q can be divided into two categories: direct estimation and inversion. Direct estimation methods can be divided into three categories according to the different computational domains: time domain, frequency domain and t...
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IPC IPC(8): G01V1/50
CPCG01V1/50G01V2210/6169
Inventor 张录录夏建军秦鑫郭再平宋娜许杰忠
Owner BC P INC CHINA NAT PETROLEUM CORP