[12] Patent
[11] Patent No.:GC0007520  
[45] Date of Publishing the Grant of the Patent: 30/Apr /2018                48/2018  
Number of the Decision to Grant the Patent:2018/125683
Date of the Decision to Grant the Patent:05/Apr/2018

[21] Application No.:GC 2013-23994

[22] Filing Date:1/4/2013

[30] Priority:

[33] State [32] Priority date [31] Priority No.
PCT
2/4/2012
PCT/US2012/031912

[72] Inventors:1- Mark V. COLLINSŲŒ2- Arthur CHENG

[73] Owner: Halliburton Energy Services,Inc., 10200 Bellaire Boulevard, Houston, 77072, Texas , USA

[74] Agent: Saba & Co. T.M.P

  

 

  

[51]IPC:
Int. Cl.: G01V 1/50 (2006.01)

[56] Cited Documents:

-US 2011/058451 Al (YONESHIMA SHINJI [JP]) 10 March 2011
-US 2003/167835 Al (SINHA BIKASH K [US] ET AL) 11 September 2003
-ZHENXIN ZHANG ET AL: Shear Slowness Estimation by Inversion of LWD Borehole Quadrupole Mode ,PROCEEDINGS OF THE 2010 SEG ANNUAL MEETING, 22 October 2010
 
Examiner: Eng. Mohammed A. AlJaafar

[54] ACOUSTIC LOGGING SYSTEMS AND METHODS EMPLOYING MULTI-MODE INVERSION FOR ANISOTROPY AND SHEAR SLOWNESS
[57] Abstract: Acoustic logging systems and methods are provided with multi-mode inversion for at least vertical shear slowness and shear anisotropy. At least some method embodiments acquire waveforms for multiple acoustic wave modes as a function of tool position in a borehole, derive position-dependent mode dispersion curves from the waveforms, match the derived dispersion curves with parameterized dispersion curves to determine a vertical shear slowness and a shear anisotropy as a function of position, and displaying a borehole log that represents at least one of the vertical shear slowness and the shear anisotropy as a function of position. The objective function employed for the inversion is evaluated across multiple wave propagation modes and mud slownesses and may employ an adaptive, frequency-dependent weighting based on distance between the derived dispersion curves and the parameterized dispersion curves.
No. of claims: 18     No. of figures: 8


 

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