Seismic inversion method, system and device based on wave equation and medium

A wave equation and seismic inversion technology, applied in seismology, measurement devices, seismic signal processing, etc., can solve problems such as limited practicality, and achieve the effect of reducing the amount of calculation, low memory requirements, and memory occupancy advantages

Pending Publication Date: 2021-10-15
GUANGDONG ZHANJIANG PROVINCIAL LAB OF SOUTHERN MARINE SCI & ENG +2
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Problems solved by technology

[0003] However, for the first-arrival tomography of the 3D wave equation, even if the wave field reconstruction strategy is used to calculate the gradient, the calculation amount is still several orders of magnitude higher than that of ray tomography, which severely limits the practical application of this technology.

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  • Seismic inversion method, system and device based on wave equation and medium
  • Seismic inversion method, system and device based on wave equation and medium
  • Seismic inversion method, system and device based on wave equation and medium

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Embodiment Construction

[0050] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention. For the step numbers in the following embodiments, it is only set for the convenience of illustration and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art sexual adjustment.

[0051] In the existing technology, for the first arrival tomography of the 3D wave equation, even if the wave field reconstruction strategy is used to calculate the gradient, the calculation amount is still se...

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Abstract

The invention provides a seismic inversion method, system and device based on a wave equation, and a medium. The method comprises the following steps: obtaining and determining calculation parameters of a single-frequency sensitivity kernel function according to seismic observation parameters and initial velocity model parameters; generating a speed model of a random boundary; performing wave equation forward modeling according to the calculation parameters and the speed model to obtain a synthetic seismic record and a frequency domain incident wave field; determining a travel-time accompanying seismic source according to the synthetic seismic record, and determining a single-frequency gradient of a travel-time target functional according to the travel-time accompanying seismic source; extracting a low wave number part from the single-frequency gradient, and carrying out seismic velocity inversion according to the low wave number; compared with a wave equation travel time chromatography technology based on a wave field reconstruction framework, the method has remarkable advantages in the aspects of calculation efficiency, memory occupation and algorithm complexity, and can be widely applied to the technical field of seismic velocity modeling.

Description

technical field [0001] The invention relates to the technical field of seismic velocity modeling, in particular to a seismic inversion method, system, device and medium based on wave equations. Background technique [0002] In the traditional wave equation traveltime inversion (Luo and Schuster, 1991; Tromp et al., 2005), the gradient of the objective function can be derived using the adjoint state theory, which can usually be expressed as a zero-delay cross-correlation between the incident field and the adjoint field (Lailly, 1983; Liu and Tromp, 2006, 2008; Fichtne et al., 2006). It is considered that the incident field propagates forward along time, while the accompanying wave field propagates backward in time. In order to simultaneously obtain the incident field and accompanying field at a certain moment, some strategies need to be adopted to balance calculation and storage: such as optimal checkpointing method (Symes, 2007), random boundary conditions (random boundary ...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/303G01V1/282G01V2210/6222G01V2210/675
Inventor 张海荣李列高永德欧阳敏童传新胡林杨文博景鹏飞刘守伟邓聪邱宇吴涛
Owner GUANGDONG ZHANJIANG PROVINCIAL LAB OF SOUTHERN MARINE SCI & ENG
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