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Seismic source wavelet optimal setting method and device

A technology of source wavelet and seismic wavelet, applied in the field of seismic exploration

Active Publication Date: 2015-05-06
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no method has been proposed in the prior art to provide reliable source wavelets for numerical simulation of acoustic and elastic waves, migration imaging, and full waveform inversion.

Method used

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  • Seismic source wavelet optimal setting method and device
  • Seismic source wavelet optimal setting method and device
  • Seismic source wavelet optimal setting method and device

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Embodiment 1

[0110] The advantages of the present invention are illustrated by taking a homogeneous acoustic medium as an example. The speed is 3000m / s, the time sampling interval is 1ms, the space adopting interval is h=10m, and the operator length is M=5. image 3 It is the 30HZ Rake wavelet waveform; image 3 The Lake wavelet in is used as the initial source wavelet for the finite difference numerical simulation of the acoustic wave equation. When used in the finite difference numerical simulation of the one-dimensional acoustic wave equation, the waveform obtained is as follows Figure 4 As shown; when used for the finite difference numerical simulation of the two-dimensional acoustic wave equation, the waveform obtained is shown as Figure 5 Shown; When used in the finite difference numerical simulation of the three-dimensional acoustic wave equation, the waveform obtained is shown as Figure 6 shown. Depend on image 3 and Figure 4 , 5 , 6, we can see that only in the three-d...

Embodiment 2

[0113] The advantages of the present invention are illustrated by taking a homogeneous elastic medium as an example. The longitudinal wave velocity is 3200m / s, the shear wave velocity is 1600m / s, the time sampling interval is 1ms, the space interval is h=10m, and the operator length is M=5. Figure 10 It is the 20HZ Raike wavelet waveform; Figure 10 The Lake wavelet in is used as the initial source wavelet for the finite-difference numerical simulation of the two-dimensional elastic wave equation, and the obtained waveform (including horizontal and vertical components), such as Figure 11 shown. Depend on Figure 10 and 11 It can be seen that there is a big difference between the added initial source wavelet and the simulated waveform. Therefore, it is also necessary to optimize the source wavelet in the case of elastic waves.

[0114] We still use the regularized inversion algorithm proposed in this paper to optimize the source wavelet, as Figure 10 The 20HZ Reich wav...

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Abstract

The invention provides a seismic source wavelet optimal setting method and device. The seismic source wavelet optimal setting method comprises the following steps that seismic wavelets are extracted from seismic data to serve as a target wavelet and an initial seismic source wavelet; the initial seismic source wavelet is updated by means of the target wavelet and the initial seismic source wavelet through a regularization inverse algorithm; when a preset convergence condition is met, optimized seismic source wavelets are output. According to the seismic source wavelet optimal setting method and device, the optimized seismic source wavelets are obtained through regularization algorithm inversion, the initial seismic wavelets extracted from the seismic data can directly serve as the seismic source wavelets to be output to a two-dimensional migration and inversion process, and therefore the reliable seismic source wavelets can be provided for numerical simulation, migration imaging and full waveform inversion of acoustic waves and elastic waves.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a method and device for optimally setting seismic source wavelets. Background technique [0002] With the increasingly complex exploration objects, seismic imaging technology urgently needs an accurate migration method suitable for imaging of any complex structural media, and the emergence of the reverse time migration (Reverse Time Migration, RTM) method brings geophysicists Here comes hope. The reverse time migration method based on the two-way wave equation has many advantages such as simple theory, accurate imaging, no inclination limit, and adaptability to arbitrary complex velocity models. At present, the reverse time migration method has been widely used in the imaging processing of complex media. [0003] In addition, the basic problem of geophysics is to make qualitative or quantitative judgments on the underground geological structure and mineral resources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 任志明刘洋蔡晓慧
Owner BC P INC CHINA NAT PETROLEUM CORP
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