[12] Patent
[11] Patent No.:GC0004552  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2016                32/2016  
Number of the Decision to Grant the Patent:2016/89880
Date of the Decision to Grant the Patent:21/Dec/2016

[21] Application No.:GC 2012-20447

[22] Filing Date:5/2/2012

[30] Priority:

[33] State [32] Priority date [31] Priority No.
US
US
30/3/2011
15/7/2011
61/469,478
61/508,440

[72] Inventors:1- Partha S. Routh،2- Spyridon K. Lazaratos،3- Anatoly Baumstein،4- Ivan Chikichev،5- Ke Wang

[73] Owner: ExxonMobil Upstream Research Company, P.O. Box 2189, Houston, Texas, USA

[74] Agent: Saud M. A. Shawwaf Law Office

  

 

  

[51]IPC:
Int. Cl.: G01V 1/28 (2006.01)

[56] Cited Documents:

- US 2011/000678 A1 (KREBS JEROME R [US] ET AL) 06 January 2011
- US 2010/270026 A1 (LAZARATOS SPYRIDON [US] ET AL) 28 October 2010
 
Examiner: Eng. Mohammed A. AlJaafar

[54] IMPROVING CONVERGENCE RATE OF FULL WAVEFIELD INVERSION USING SPECTRAL SHAPING
[57] Abstract: Method for speeding up iterative inversion of seismic data (106) to obtain a subsurface model (102), using local cost function optimization. The frequency spectrum of the updated model at each iteration is controlled to match a known or estimated frequency spectrum for the subsurface region, preferably the average amplitude spectrum of the subsurface P-impedance. The controlling is done either by applying a spectral-shaping filter to the source wavelet (303) and to the data (302) or by applying the filter, which may vary with time, to the gradient of the cost function (403). The source wavelet’s amplitude spectrum (before filtering) should satisfy , where f is frequency, is the average amplitude spectrum of the seismic data, and is the average amplitude spectrum for P-impedance in the subsurface region (306,402) or an approximation thereof.
No. of claims: 23     No. of figures: 12


 

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