Prestack earthquake multi-parameter inversion method mixed with global optimization algorithm

A pre-stack seismic and global optimization technology, which is applied in the field of seismic data inversion in oil and gas geophysical exploration, can solve problems such as instability and immature convergence of traditional particle swarm algorithm, and achieve obvious inversion effect and improved inversion effect , to overcome the unstable effect

Inactive Publication Date: 2017-09-22
HOHAI UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a pre-stack seismic multi-parameter inversion method with a hybrid global optimization algorithm, overcome the unstable problem of pre-stack seismic multi-parameter inversion, and solve the problem of immature convergence of the traditional particle swarm optimization algorithm , the inversion results of three seismic parameters can be obtained synchronously and accurately

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  • Prestack earthquake multi-parameter inversion method mixed with global optimization algorithm
  • Prestack earthquake multi-parameter inversion method mixed with global optimization algorithm
  • Prestack earthquake multi-parameter inversion method mixed with global optimization algorithm

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Embodiment Construction

[0041] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. 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.

[0042] Such as figure 1 Shown is the flowchart of the inversion method of the present invention, and the specific steps are as follows:

[0043]Step 1, initialize the settings. Discretize the model to be inverted, set the value range of the P-wave velocity, S-wave velocity and density to be inverted at each position; set the number of particles N, the maximum number of iterations K and the simulated annealing cooling schedule; set the weighting coefficient of the learning item c 1 and c 2 .

[0044] Weighting coefficient c 1 and c 2 Simulated annealing learning item and multidimensional learning item corresponding to particle velocity update, respectively. The ch...

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Abstract

The invention discloses a prestack earthquake multi-parameter inversion method mixed with a global optimization algorithm. According to the method, particle swarm optimization (PSO) is effectively combined with a rapid simulated annealing algorithm, the problem that traditional PSO tends to cause premature convergence is solved, multiple dimensions of learning items which are combined preferentially on the basis of the joint probability density of three parameters are added to the PSO, the problem that synchronous inversion of multiple pre-stack earthquake parameters is not stable is overcome,and inversion results of three parameters, namely the longitudinal wave speed, the transverse wave speed and the density, can be obtained synchronously and accurately. The method can be used to inverse synthesized earthquake data to obtain a satisfied result, and the inversion effect is obviously is improved obviously compared with that obtained via traditional PSO.

Description

technical field [0001] The invention relates to a pre-stack seismic multi-parameter inversion method of a hybrid global optimization algorithm, in particular to a hybrid global optimization algorithm combined with a multidimensional learning particle swarm algorithm and a fast simulated annealing algorithm, which belongs to seismic data inversion in oil and gas geophysical exploration. Acting technology field. 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 Geological 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. ...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/303G01V1/306G01V2210/512G01V2210/6222G01V2210/6224
Inventor 郭强张宏兵尚作萍
Owner HOHAI UNIV
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