A Converted-Wave Static Correction Method Based on Surface-Wave Traveltime Tomography
A travel-time tomography and converted wave technology, which is applied in the field of converted wave static correction based on surface wave travel-time tomography, can solve the problems of limited exploration accuracy and difficulty in obtaining the static correction of receiver points, and achieve flexible calculation and improved Horizontal resolution, high processing precision effect
Active Publication Date: 2021-06-08
XI'AN PETROLEUM UNIVERSITY
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[0002] Static correction is a key step in the processing of converted wave exploration data. The amount of static correction is related to the velocity structure of the low-velocity shear wave zone, which usually changes drastically. The traditional surface wave static correction processing method uses a set of multi-channel seismic records as The processing unit obtains the average static correction value of multiple geophone points, and it is difficult to obtain the independent static correction value of each geophone point, which limits the accuracy of exploration
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[0036] A converted wave static correction method based on surface wave travel time tomography, comprising the following steps:
[0037] (1) Recording of converted wave data: record the collected converted wave data as D(x i ,t j ),See figure 2 , where x i Indicates the position of the detection points of each converted wave data on the survey line, i=1,2,3...,n, n represents the total number of detection points in the converted wave data; t j Represents the sampling time series of each converted wave data record, j=1,2,3,...,m, m represents the total sampling length of the sampling time series;
[0038] (2) Separation of surface wave and wave field modes: using F-K transformation for wave field separation processing, from the converted wave data D(x i ,t j ) to separate surface wave field records, denoted as D 面波 (x i ,t j ),See image 3 , where x i and t j and x in step (1) i and t j The meaning expressed is the same;
[0039] (3) Dispersion curve calculation: ...
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A converted wave static correction method based on surface wave travel time tomography of the present invention is characterized in that the surface wave wave field record with high signal-to-noise ratio is obtained from the converted wave data by using the surface wave wave field mode separation method, and then The phase difference method is used to calculate the surface wave dispersion curve between the two converted wave detectors, and then the travel time of each frequency component surface wave is extracted, and tomographic inversion is performed to obtain the pure path frequency of each converted wave detector point. Finally, the above-mentioned dispersion curve is inverted to establish the shear wave velocity structure, and the static correction process is completed according to the shear wave velocity structure of each receiver point. The benefit of the present invention is that a converted wave static correction method based on surface wave travel time tomography of the present invention obtains the shear wave static correction of each independent receiver point through the travel time tomography method, which solves the problem that the traditional surface wave method only The short board of being able to obtain the average static correction of multiple receiver points, and greatly improve the accuracy of exploration.
Description
technical field [0001] The invention belongs to the data processing method and technology of converted wave static correction in the technical field of petroleum exploration, and in particular relates to a converted wave static correction method based on surface wave travel time tomography. Background technique [0002] Static correction is a key step in the processing of converted wave exploration data. The amount of static correction is related to the velocity structure of the low-velocity shear wave zone, which usually changes drastically. The traditional surface wave static correction processing method uses a set of multi-channel seismic records as The processing unit obtains the average static correction value of multiple geophone points, and it is difficult to obtain the independent static correction value of each geophone point, which limits the accuracy of exploration. Using the two-channel dispersion curve extraction technology, the surface wave travel time between ...
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IPC IPC(8): G01V1/36
Inventor 李欣欣
Owner XI'AN PETROLEUM UNIVERSITY