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Least squares reverse time migration method based on multi-source hybrid dynamic coding

A technique of least squares and reverse time migration, which is applied in the field of seismic exploration data processing and interpretation, can solve the problems of inconvenience and high calculation cost, and achieve the suppression of cross-term noise of the code, imaging focus, reduction of difficulty and The Effects of Risk on Reservoir Development

Inactive Publication Date: 2017-06-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Although the least squares reverse time migration has many advantages, its computational cost is too large to be conveniently applied in actual production

Method used

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  • Least squares reverse time migration method based on multi-source hybrid dynamic coding
  • Least squares reverse time migration method based on multi-source hybrid dynamic coding
  • Least squares reverse time migration method based on multi-source hybrid dynamic coding

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Embodiment Construction

[0048] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0049] A Least Squares Reverse Time Migration Method Based on Multi-Source Hybrid Dynamic Coding.

[0050] In the multi-source coded least squares reverse time migration, firstly, the multi-source coding matrix is ​​used to transform the single-shot gather into a super-shot gather, and then the super-shot gather is used to define the objective function for estimating the reflection coefficient,

[0051]

[0052] in, Represents the observed multi-source supershot gather; Represents the simulated multi-source super-shot gather; B represents the multi-source encoding matrix. Compared with formula (4), when B T When B=I, the result of least squares reverse time migration based on multi-source encoding is the same as that of common shot least squares reverse time migration. In order to achieve this goal, the encoding matrix needs to be an orthogonal matrix, which ...

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Abstract

The invention discloses a least squares reverse time migration method based on multi-source hybrid dynamic coding. In multi-source coding least squares reverse time migration, a multi-source coding matrix is firstly used for converting a single-shot gather component into a super-shot gather, then the super-shot gather is used for defining a target function of an estimated refection coefficient; cross term noise is introduced into a least squares reverse time migration result, an encoder matrix at each stage is selected to serve as an orthogonal matrix, and each sub-question is formed by using a hybrid coding mode. According to the least squares reverse time migration method based on a bi-directional wave equation theory and an inverse theory provided by the invention, amplitude with more fidelity can be provided, the image is more focused, a seismic offset result with less false appearance is imaged, and thus seismic interpretation difficulty and a petroleum reservoir exploitation risk are reduced. Meanwhile, according to the multi-source coding method provided by the invention, enhancement of computation efficiency and suppression of cross item noise of coding can be well achieved during a least squares reverse time migration iteration process.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration data processing and interpretation, in particular to a least squares reverse time migration method based on multi-source hybrid dynamic coding. Background technique [0002] Seismic migration imaging method technology is the core technology of seismic exploration. Currently, the imaging technology used in seismic exploration usually uses the conjugate operator of the seismic wave forward operator to estimate the subsurface reflection coefficient, such as the Kirchhoff migration method, the one-way wave migration method and the reverse time migration method. In order to better estimate the subsurface reflection coefficient, it is necessary to use the inversion theory to estimate the reflection coefficient, that is, the least squares migration method. Due to the imaging accuracy advantages of reverse time migration, compared with conventional migration methods, the least squares reverse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/34
CPCG01V1/308G01V1/345G01V2210/32G01V2210/612
Inventor 唐祥功匡斌单联瑜赵庆国王修敏王贤真隆文韬胡江涛王华忠刘守伟陈云峰杨淑卿
Owner CHINA PETROLEUM & CHEM CORP
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