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Comprehensive Well And Geological Constrained Seismic Inversion

Posted on:2004-03-10Degree:MasterType:Thesis
Country:ChinaCandidate:Y J XuFull Text:PDF
GTID:2120360122466475Subject:Geological Engineering
Abstract/Summary:PDF Full Text Request
Comprehensive well and geological constrained seismic inversion -Comprehensive Constrained inversion (CCI), is based on nonlinear inversion techniques. It makes full use of detailed vertical resolution of well data and horizontal dense sampling of seismic data. According to geological theory, it inverts lithological profile in multi-wells and complex geological condition..At present, there are no perfect mathematical methods to solve nonlinear equations. This paper has proposed a method controlling iteration number and stability of solution according to thought of integral convergence algorithm minimizing nonlinear equations. This method can approach local extreme value available, but it is not the optimal solution or optimal resolution. In fact, to obtain optimal solution is the optimization problem of nonlinear system. From one band, we must select good method to solute nonlinear equations. From other band, we must build a good control function .Using geological and well information to build control function to restrain inversion is put forwarded by this paper. Using this control function of CCI makes converge quickly, decreases interference caused by bad seismic data, makes iteration direction closely to solution, decreases multiple roots and improves resolution of impedance and reliability of seismic inversion. According to this paper, satisfactory results can be obtained by using maximum and minimum velocity and encircle of acoustic curves building control function to restrain seismic inversion...
Keywords/Search Tags:Nonlinear inversion, Iteration, Initial model, Lithological inversion, Reservoir prediction
PDF Full Text Request
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