Method for inversion constituting virtual well data using before-folded seismic wave form

A technology of waveform inversion and pre-stack seismic, which is applied in the fields of seismology and seismic signal processing for well logging records, can solve the problems of non-uniqueness and large amount of calculation, and improve the The effect of resolution

Inactive Publication Date: 2007-11-28
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0008] The above four advances have basically solved the highly nonlinear and local minimum problems faced by pre-stack se

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  • Method for inversion constituting virtual well data using before-folded seismic wave form
  • Method for inversion constituting virtual well data using before-folded seismic wave form
  • Method for inversion constituting virtual well data using before-folded seismic wave form

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Embodiment Construction

[0044] Specific embodiments of the present invention are described in detail below.

[0045] Prestack waveform inversion is to generate synthetic seismic records based on the formation model and compare them with the measured data, modify the model parameters according to the degree of matching between the two, so as to obtain the virtual wave impedance logging curve under the condition of no well, so as to improve the no-well constraint. The resolution of seismic wave impedance inversion under certain conditions can be used for the purpose of oil and gas exploration in deep sea without wells.

[0046]The invention uses genetic algorithm (GA) pre-stack seismic waveform inversion to estimate elastic parameters, so as to construct virtual well data by using pre-stack seismic waveform inversion. Prestack inversion is performed on corner gathers to reduce computational effort.

[0047] The material basis of the invention is to collect a large amount of original seismic data throu...

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Abstract

The method includes steps: (1) through analysis of collected prestacked seismic data gives out seismological record of actual measured angle track set; (2) setting up geologic model; (3) selecting convergent function and determining precision of inversion; (4) determining search range and interval of model parameters, and integral encoding parameters, generating total body of initial stochastic model for fitting geologic model; (5) calculating synthetic seismogram of total body, comparing synthetic seismogram with seismological record actual measured, and calculating value of objective function; (6) calculating GA generates new total body of mode P[j] to update initial total body; (7) calculating synthetic seismogram Syn[j] of P[j] , comparing Syn[j] with Seis, and calculating and saving value of objective function; (8) ending steps and outputting result if termination condition is met; otherwise repeating (6)-(8). The method raises resolution of inversion without constraint condition of well.

Description

technical field [0001] The invention relates to a wave impedance inversion algorithm in petroleum geophysical exploration, in particular to a method for obtaining virtual acoustic logging data by using pre-stack seismic data based on genetic algorithm. Background technique [0002] Seismic inversion can be divided into pre-stack inversion and post-stack inversion. The physical properties obtained by the general pre-stack inversion method provide more detailed characteristics of the subsurface strata than the post-stack inversion method. Pre-stack inversion has high resolution, but is slow and poor in stability. It is currently in the research stage, and there is still a certain distance from large-scale production and application. Although post-stack inversion has a lower resolution, it is fast and stable and meets the needs of large-scale production applications. Therefore, inversion is usually performed on post-stack data, but post-stack seismic data lacks the With rich ...

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Application Information

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IPC IPC(8): G01V1/28G01V1/40
Inventor 王英民杨绍国
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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