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Earthquake multi-data combined three-dimensional velocity modeling method and system

A velocity modeling and seismic data technology, applied in the field of oil and gas geophysical prospecting engineering, can solve the problems of high computational cost and high dependence on low-frequency information, and achieve the effect of high inversion accuracy and reduced dependence

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Full waveform inversion has a perfect mathematical and physical theoretical basis, and can describe the physical parameter model of the underground medium with high precision. However, full waveform inversion has strong nonlinearity and dependence on the initial model and low-frequency information in the data. High, high computational cost and other issues

Method used

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  • Earthquake multi-data combined three-dimensional velocity modeling method and system
  • Earthquake multi-data combined three-dimensional velocity modeling method and system
  • Earthquake multi-data combined three-dimensional velocity modeling method and system

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Experimental program
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Effect test

Embodiment 1

[0066] like figure 1 Shown, the inventive method comprises the following steps:

[0067] S1, establishing a weighted target functional based on the first arrival travel time residual of the seismic wave and the residual error of the seismic wave waveform;

[0068] The step S1 establishes a weighted target functional, the specific formula is as follows:

[0069]

[0070] Among them, ω t is the residual weight factor of the first arrival travel time of the earthquake, ω u is the seismic waveform residual weight factor; is the residual error between the collected waveform data and the theoretically calculated waveform data (the waveform residual obtained by using the following S7), is the first arrival travel time information picked up from seismic records and the first arrival travel time residual obtained by theoretical calculation (the travel time residual obtained by using S5 below). ω t with ω u The selection criterion of is determined according to the inversion ...

Embodiment 2

[0085] The system includes: a memory, a processor, and a computer program stored on the memory, and the computer program is executed by the processor to perform the following steps:

[0086] (1) Input the initial observed seismic data, picked up first-arrival traveltime data, initial velocity model and polar encoding matrix;

[0087] (2) Utilizing the polar encoding matrix and initial observed seismic data to synthesize super shot seismic data;

[0088] (3) Utilize described initial speed model to calculate and obtain first arrival travel time;

[0089] (4) Obtain travel time residual;

[0090] (5) using the target wavelet and the polar encoding matrix to generate polar encoding forward modeling super shot seismic data through the initial velocity model;

[0091] (6) Obtaining the waveform residual;

[0092] (7) Obtaining the gradient of the novel target functional by utilizing the traveltime residual and the waveform residual;

[0093] (8) Obtain the optimal step size cor...

Embodiment 3

[0097] A 3D velocity modeling method for seismic multi-data joint, such as figure 1 shown, including the following steps:

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Abstract

The invention provides an earthquake multi-data combined three-dimensional velocity modeling method and system, and belongs to the field of oil and gas geophysical prospecting engineering. According to the seismic multi-data combined three-dimensional velocity modeling method, travel time data and waveform data in seismic exploration are combined, and three-dimensional velocity modeling is realized by using the travel time data and the waveform data. On the basis of the traditional velocity modeling technology, travel time data and waveform data in seismic exploration are combined and jointly participate in the velocity modeling process, so that the cycling-ski phenomenon existing in the conventional FWI and the dependency on an initial model and low-frequency data are reduced, and the velocity modeling accuracy is improved. And a speed modeling result with higher inversion precision under the same data condition is obtained.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysical prospecting engineering, and in particular relates to a three-dimensional velocity modeling method and system for combining multiple seismic data. Background technique [0002] The accuracy of velocity modeling is of great significance to the accuracy of migration imaging of subsurface structures and the reliability of structural interpretation. To some extent, the quality of velocity modeling results directly determines the success or failure of seismic exploration. High-precision velocity modeling technology can be applied not only in the oil exploration industry, but also in natural earthquakes, water and soil resources, engineering geophysical exploration and other industries. With the continuous advancement of seismic exploration technology and the rapid development of high-performance computing bases, the current seismic exploration is completely processed in the depth domain, so the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 袁双齐
Owner CHINA PETROLEUM & CHEM CORP