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A Multiscale Full Waveform Inversion Method for Conventional Land Seismic Data

A technology of full waveform inversion and seismic data, applied in the field of seismic exploration, can solve the problems of small data offset, inability to obtain results, inability to obtain effects, etc., and achieve the effect of improving accuracy

Active Publication Date: 2022-05-13
中国地质科学院地球物理地球化学勘查研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, full waveform inversion has been successfully applied to marine seismic data, but there are still many difficulties in the application of conventional land seismic data
Compared with marine seismic data, conventional land seismic data has a small offset and lacks low-frequency information. Since the frequency of conventional industrial geophones is 10 Hz, while the frequency of land seismic data is often higher than 5 Hz, conventional land seismic data is of great importance to For the full waveform inversion method, the frequency is too high, and the full waveform inversion method is used to process conventional land seismic data, and it is impossible to obtain better results
[0003] At the same time, the application of the full waveform inversion method is limited by the "cycle slip" phenomenon commonly found in gradient inversion methods
The "cycle slip" phenomenon means that during inversion, when the difference between the initial record and the actual record is less than 1 / 2 cycle, the inversion converges to obtain the global optimal value, and when the difference between the initial record and the actual record is greater than 1 / 2 period, the inversion converges to get a local optimum, and the correct result cannot be obtained

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  • A Multiscale Full Waveform Inversion Method for Conventional Land Seismic Data
  • A Multiscale Full Waveform Inversion Method for Conventional Land Seismic Data
  • A Multiscale Full Waveform Inversion Method for Conventional Land Seismic Data

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Embodiment 1

[0058] The present invention proposes a multi-scale full waveform inversion method for conventional land seismic data, such as figure 1 As shown, it specifically includes the following steps:

[0059] Step 1, establish a full waveform inversion model, such as figure 2 As shown, it specifically includes the following steps:

[0060] Step 1.1, input the original seismic data, pick up the first arrival travel time of the original seismic data to obtain the actual travel time, combine the original seismic data to select the first arrival data, and set the tomographic imaging parameters.

[0061] Step 1.2, according to the first arrival data, based on the two-dimensional ray tracing seismic tomography method, the tomography result is obtained, and the tomography velocity model is determined.

[0062] Step 1.3: Carry out forward modeling on the tomographic imaging velocity model, calculate the first arrival travel time at each shot point excitation geophone position, obtain the f...

Embodiment 2

[0085] A multi-scale full-waveform inversion method for conventional land area seismic data proposed by the present invention is applied to an ideal model for testing, and an ideal inversion effect is obtained.

[0086] According to the seismic profile and rock physical data in a certain area, a two-dimensional P-wave velocity model is constructed. Based on the Gardner empirical relationship, the P-wave velocity is converted into a density, and the density model is constructed. The quality factor model is set as a constant, and multi-scale full waveform inversion is performed. The parameters used in the scale full waveform inversion process are shown in Table 1.

[0087] In the process of multi-scale full waveform inversion, according to the actual seismic data observation system in this area, the maximum offset of the forward modeling seismic data observation system is set to 14.4km, and the maximum offset of the forward modeling seismic data observation system is different fr...

Embodiment 3

[0092] A multi-scale full-waveform inversion method for conventional land area seismic data proposed by the present invention is applied to actual data processing, and ideal effects are obtained.

[0093] Select 40 km of land deep reflection seismic data in a certain area, and there is a geothermal well with a depth of 2500 meters at the position of 900 meters of the survey line, which is used as a verification well for the inversion results. The source of the seismic data excitation is an explosive source, and the geophone is a 10Hz analog geophone used in conventional industrial production. The track spacing is 20m, the shot distance is 100m, the number of receiving channels is 1440, the minimum offset distance is 10m, and the maximum offset distance is 14.4km.

[0094] Perform multi-scale full waveform inversion on actual data, including the following steps:

[0095] Step 1, establish an initial model;

[0096] Input the original seismic data, obtain the first arrival trav...

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Abstract

The invention provides a multi-scale full waveform inversion method for conventional land area seismic data, and specifically relates to the technical field of seismic exploration. This method uses the tomography results of the original seismic data to evaluate the cycle slip risk, establishes a full waveform inversion model, preprocesses the original seismic data and matches the amplitude of the forward simulated seismic data, and then transforms it from the time domain to the frequency domain as Multi-scale full-waveform inversion data, set inversion parameters, and perform multi-scale full-waveform inversion based on the Laplace-Fourier domain multi-scale full-waveform inversion method based on layer stripping. It traverses all Laplace constants and all frequencies from low frequency to high frequency, and obtains multi-scale full waveform inversion results. The invention overcomes the cycle slip problem existing in the full waveform inversion method, makes full use of the low-frequency information in the measured data, effectively improves the full waveform inversion effect of the land area seismic data, and provides a basis for the geological interpretation of the conventional land area.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a multi-scale full waveform inversion method for conventional land area seismic data. Background technique [0002] At present, full waveform inversion has been successfully applied to marine seismic data, but there are still many difficulties in the application of conventional land seismic data. Compared with marine seismic data, conventional land seismic data has a small offset and lacks low-frequency information. Since the frequency of conventional industrial geophones is 10 Hz, while the frequency of land seismic data is often higher than 5 Hz, conventional land seismic data is of great importance to For the full waveform inversion method, the frequency is too high, and the full waveform inversion method can not be used to process conventional land seismic data, and good results cannot be obtained. [0003] At the same time, the application of the full waveform i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/62
Inventor 王凯岳航羽张保卫王小江张凯李金丽
Owner 中国地质科学院地球物理地球化学勘查研究所