Time-domain full waveform inversion method by utilizing variable-step-length grid acoustic wave field simulation

A technology of full waveform inversion and acoustic wave field, applied in the field of petroleum exploration, can solve the problems of reducing the amount of calculation, insufficient simulation accuracy in the time direction, etc., and achieve the effects of improving the accuracy, solving the low calculation efficiency and reducing the calculation amount.

Active Publication Date: 2015-10-14
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

[0004] The purpose of the present invention is to provide a solution to the numerical dispersion phenomenon caused by insufficient simulation accuracy in the time direction in the realization of the full waveform in

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  • Time-domain full waveform inversion method by utilizing variable-step-length grid acoustic wave field simulation
  • Time-domain full waveform inversion method by utilizing variable-step-length grid acoustic wave field simulation
  • Time-domain full waveform inversion method by utilizing variable-step-length grid acoustic wave field simulation

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Embodiment approach

[0027] The technical problem to be solved by the invention is a high-precision and high-efficiency acoustic wave field simulation technology applied to full wave field inversion. Concrete implementation scheme is as follows:

[0028] (1) Artificially stimulate seismic waves along the shot line direction in the work area, receive and record the seismic wave field by the geophone, and obtain seismic observation data d ij (t)=d(x i ,x j ,t), where x i and x j , represent the spatial positions of the source and receiver points, respectively, and t represents the observation time.

[0029] (2) Using the sampling theorem, the variable-step-size spatial grid is established according to the propagation velocity of each layer of wave field and the main frequency of the simulated data, and the variable-step-size grid is used to subdivide the work area using the extension depth. According to the geological information of the work area, etc. initial velocity field.

[0030] (3) Adop...

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Abstract

The invention relates to a time-domain seismic waveform inversion method by utilizing variable-step-length grid acoustic wave field simulation in the field of seismic data depth modeling. The method is characterized by carrying out subdivision by utilizing a variable-step-length grid in continuation depth direction; increasing calculating grid points on grid diagonals of a star convolution operator; obtaining an accurate relational expression of a wave field evolved with the time in a time-wave number domain; calculating convolution coefficients of the grid points according to wave field propagation speed of spatial points and time continuation step length to enable the error of wave number domain time evolution relationship corresponding to each point to be minimum; in the simulation space range, establishing speed indexes and calculating convolution operators corresponding to the speeds; and carrying out wave field forward simulation by utilizing the convolution operators and the speed indexes to enable error of a seismic wave field recorded in the field and a seismic wave field obtained through forward simulation to be reduced, and iteratively updating a speed model and finishing inversion. The method solves the problem of poor precision of time derivative approximate calculation caused by an existing algorithm and solves the problem of heavy wave field simulation calculation burden and low calculating efficiency.

Description

technical field [0001] The invention relates to oil exploration technology, and is a time-domain seismic waveform inversion method applied to seismic data depth modeling by using variable step size grid acoustic wave field simulation. Background technique [0002] One of the important purposes of seismic data processing is to obtain high-quality depth-domain images through depth migration. The quality of depth domain image depends on the quality of seismic velocity model, so modeling technology plays a pivotal role in the whole seismic data processing. Full Waveform Inversion (Full Waveform Inversion) is a data domain (Data Domain) seismic modeling technology. Its basic principle is to determine the amount of model change by comparing the difference between the simulated data obtained by forward modeling and the actual observed data, and iterate repeatedly. This process is performed until the difference between simulated and observed data is minimized. Compared with the tr...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 戴南浔武威
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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