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Desert complex noise suppression method based on manifold partitioned 2D-VMD

A 2D-VMD, noise suppression technology, applied in measurement devices, instruments, scientific instruments, etc., can solve the problem of inability to achieve effective suppression of low-frequency noise and effective signal recovery, and achieve the effect of effective suppression

Inactive Publication Date: 2019-09-06
JILIN UNIV
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Problems solved by technology

[0006] The present invention provides a method for suppressing complex noise in deserts based on manifold partition 2D-VMD, aiming at the complex and low-frequency characteristics of noise in desert areas, so as to solve the problem that the existing noise reduction technology cannot achieve effective suppression of low-frequency noise and effective signal recovery

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  • Desert complex noise suppression method based on manifold partitioned 2D-VMD
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  • Desert complex noise suppression method based on manifold partitioned 2D-VMD

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experiment example 1

[0082] Experimental Example 1 Synthetic Seismic Records

[0083] The simulation generates a synthetic seismic record with 80 traces and 2048 sampling points in each trace. The sampling frequency is 1000 Hz, and some actual desert noise is added to it. The resulting noisy record is shown in Fig. 3(a). There are five seismic events in this noisy record, all of which have a dominant frequency of 20 Hz. EMD, one-dimensional VMD and the method of the present invention are used to denoise them respectively, and the denoising results are shown in Fig. 3(b), 3(c) and 3(d). From the multi-channel results of the three methods, it can be seen that after the EMD method denoises, part of the noise has been effectively suppressed, but there are still many noises remaining. The denoising effect of one-dimensional VMD method is better than that of EMD method, but the noise suppression effect of some seismic traces is not very good. In contrast, after processing by the method of the present ...

experiment example 2

[0085] Experimental Example 2 Actual Seismic Records

[0086] In order to verify the practical application effect of the present invention, the method is applied to some actual field seismic data in Fig. 5(a), which comes from the Tarim Desert in China. The seismic section contains 216 traces, each with 2250 sample points, and the sampling frequency is 1000 Hz. There are large fluctuations in the noisy records, and the changes in the shape of the event are all caused by low-frequency noise. The noise-containing record is denoised by using the EMD method, the one-dimensional VMD method and the method of the present invention, and the results are shown in Figures 5(b), 5(c) and 5(d). In order to facilitate the observation of the denoising effect, we circled three representative areas, in which area A is the noise part before the first arrival, and the low-frequency noise in area B and area C caused large fluctuations in the event.

[0087] From the denoising results, it can be ...

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Abstract

The invention relates to a desert complex noise suppression method based on manifold partitioned 2D-VMD and belongs to a desert area complex noise suppression method. According to characteristics of desert noises, through utilization of an ISOMAP manifold learning algorithm, noise-contained seismic records are divided into signal-contained areas and no-signal areas, and the no-signal areas are regarded as pure noises and are cleared; multimode decomposition is carried out on data in the signal-contained areas through utilization of a 2D-VMD algorithm, thereby realizing division of different shapes and different frequencies of data; and a few of effective sub-mode signals are summed to recover seismic signals, thereby realizing noise suppression. The method has the beneficial effects that seismic data is analyzed and processed from a two-dimensional angle, correlation of events between adjacent seismic traces and influence of event forms on a denoising effect are taken into consideration, moreover, a spectral decomposition process with relatively low aliasing can be realized in a frequency domain, and the method is relatively applicable to low frequency noise suppression. Accordingto the method, effective suppression of complex low frequency noises and clear and coherent recovery of the effective seismic signals can be effectively realized.

Description

technical field [0001] The invention belongs to a complex noise suppressing method in a desert area. Background technique [0002] Seismic exploration is one of the important ways of geophysical exploration and oil and gas exploration. Oil and gas exploration is the foundation of the petroleum industry and plays an important role in the national economy. In recent decades, most oilfields have entered the stage of high production, and the production of major old oilfields is decreasing. The development of new oilfields is an urgent and important task. The Tarim Oilfield located in Northwest my country is the largest natural gas producing area and an important oil production base in China. The Tarim Basin where it is located is the largest oil and gas-bearing basin in China, with a total area of ​​560,000 square kilometers. It is the largest natural gas producing area and an important oil production base in China. [0003] In the processing of seismic exploration data, the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/364G01V2210/324
Inventor 田雅男李月吴宁董新桐李默
Owner JILIN UNIV
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