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Pre-stack seismic multi-parameter synchronous inversion nonlinear method based on hybrid Markov neighborhood

A pre-stack seismic and multi-parameter technology, applied in the field of oil and gas geophysical exploration, can solve problems such as unstable inversion results, and achieve the effects of improving timeliness, improving stability, and controlling stability

Inactive Publication Date: 2021-01-22
HOHAI UNIV
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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a non-linear method for synchronous inversion of pre-stack seismic multi-parameters based on simulated annealing, so as to solve the problem of unstable inversion results existing in the prior art

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  • Pre-stack seismic multi-parameter synchronous inversion nonlinear method based on hybrid Markov neighborhood
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  • Pre-stack seismic multi-parameter synchronous inversion nonlinear method based on hybrid Markov neighborhood

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[0047] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings, which cannot be used to limit the protection scope of the present invention.

[0048] A pre-stack seismic multi-parameter synchronous inversion nonlinear method based on hybrid Markov neighborhood to obtain logging data, including logging velocity and density;

[0049] Obtain reflection coefficient according to logging data and Zoeppritz equation;

[0050] Obtain fitting deviation value according to well logging data, assumption conditions and background trend relationship;

[0051] According to the reflection coefficient and fitting deviation value, the objective function is solved to obtain the inversion data.

[0052] Such as figure 1, Figure 4 As shown, the specific methods include:

[0053] Step 1: Establish the mathematical model of the pre-stack angle gather, that is, the Zoeppritz equation...

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Abstract

The invention relates to a pre-stack seismic multi-parameter synchronous inversion nonlinear method based on a hybrid Markov neighborhood. The inversion method uses an accurate Zoeppritz equation instead of an approximate formula to realize pre-stack seismic inversion, and introduces two constraint conditions, thereby overcoming instability during solving at different angles caused by huge difference of orders of magnitudes in multi-parameter inversion. Then minimization of a target function is solved by using a rapid simulated annealing algorithm, so that inversion results of three parameters, namely longitudinal wave speed, transverse wave speed and density, can be synchronously and accurately obtained. The neighborhood of the hybrid Markov random field (MRF) is used for boundary protection regularization, so that the precision of the inversion result is improved, the stability of the inversion result is controlled, and the timeliness of the inversion process is improved. When the method is used for inversion of the synthetic seismic data, a satisfactory result is obtained, and compared with traditional prestack seismic inversion, the inversion effect is obviously improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas geophysical exploration, in particular to a non-linear method for synchronous inversion of pre-stack seismic multi-parameters based on mixed Markov neighborhood. Background technique [0002] Prestack seismic inversion is a kind of inversion based on convolution model. It is based on the theory that amplitude varies with offset, and can simultaneously obtain multiple elastic parameters such as P-wave velocity, S-wave velocity, and density, and can effectively identify reservoir fluid types and Structural features. Therefore, pre-stack seismic inversion is currently one of the most widely used and most mature seismic inversion techniques, and plays an important role in the exploration and development of oil and gas resources. [0003] Seismic inversion is a nonlinear optimization problem that minimizes the error between the synthetic and observed seismic records corresponding to the estimated ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30G01V2210/512G01V2210/6169
Inventor 严立志张宏兵尚作萍韩飞龙
Owner HOHAI UNIV
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