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Bi-phase medium parametric inversion method based on niche master-slave parallel genetic algorithm

A genetic algorithm and two-phase medium technology, which is applied in the field of two-phase medium parameter inversion based on niche master-slave parallel genetic algorithm, can solve the problems of low optimization efficiency, large niche serial genetic algorithm, and time-consuming inversion, etc. question

Inactive Publication Date: 2013-08-07
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

However, for the inversion of reservoir parameters in dual-phase media, the fitness calculation of the niche serial genetic algorithm is very large, so its optimization efficiency is very low, and the inversion is very time-consuming

Method used

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  • Bi-phase medium parametric inversion method based on niche master-slave parallel genetic algorithm
  • Bi-phase medium parametric inversion method based on niche master-slave parallel genetic algorithm
  • Bi-phase medium parametric inversion method based on niche master-slave parallel genetic algorithm

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[0059] According to the computing requirements, MPICH2 is installed and configured under Windows 7 system and Visual Studio 2008 to build the MPI parallel computing platform.

[0060] According to well logging and petrophysical data, a two-dimensional half-space dual-phase fractured medium BISQ model was made as an implementation model for reservoir parameter inversion of niche master-slave parallel genetic algorithm (as shown in Table 1).

[0061] Table 1: Model parameters

[0062]

[0063] The location for measuring seismic records is selected on the surface of the model in Table 1, that is, at z=0. The surface solid phase displacement response u of this two-phase medium model is calculated by the staggered grid finite difference method x = (x,0,t) and u z =(x,0,t) is an additional condition for parameter inversion, that is, the actual seismic measurement data, and then assume the parameters φ, ρ to be inverted s and ρ f is unknown, construct the objective function, a...

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Abstract

The invention relates to a bi-phase anisotropic medium reservoir parametric inversion method based on a niche master-slave parallel genetic algorithm. According to the method, the niche master-slave parallel genetic algorithm is used for solving bi-phase anisotropic medium reservoir parameters, the core ideology includes that a system comprises a master processor and a plurality of slave processors, the master processor monitors a whole population, at a fitness calculation stage, the master processor distributes calculation of the fitness to all slave processors, collects results after calculation and then performs operations such as niche elimination, selection, cross and variation to generate a new generation of population so as to finish one circulation, and the calculation efficiency of reservoir parametric inversion is improved greatly. According to the method, a concept of sharing degree is introduced in the reservoir parameter evolution solving process, substantial growth of some individuals are limited through adjustment of the fitness of each individual, niche evolution environments are created, and the capacity for solving multiple-peak reservoir parametric inversion optimization problems and the solving quality through the genetic algorithm are improved. The bi-phase medium parametric inversion method is widely applied to parametric inversion processes of oil and gas reservoirs.

Description

technical field [0001] The invention relates to a reservoir parameter inversion method in the field of petroleum exploration, in particular to a two-phase medium parameter inversion method based on niche master-slave parallel genetic algorithm. Background technique [0002] The inversion of reservoir parameters (such as porosity, fluid phase density and solid phase density) is of great significance for dynamic monitoring and optimal management in oil and gas development. With the deepening of exploration and development of oil and gas fields, the problems we face are becoming more and more complex, especially the problem of reservoirs. Generally, oil and gas reservoirs are in the form of fractures, fissures, or pores, so oil and gas reservoirs often appear as two-phase media, and the traditional pure solid elastic media theory is not perfect, and cannot describe the wave propagation in rocks in detail. process impact. Since the dual-phase medium theory can more accurately ...

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Application Information

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IPC IPC(8): G06F19/00G06N3/12
Inventor 刘春成韩立国张益明王者江张生强牛聪叶云飞汪小将杨小椿仝中飞
Owner CHINA NAT OFFSHORE OIL CORP
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