The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 2022
Filed:
Mar. 11, 2019
Applicant:
Saudi Arabian Oil Company, Dhahran, SA;
Inventors:
Xuekai Sun, Beijing, CN;
Chris B. Ayadiuno, Dhahran, SA;
Assignee:
Saudi Arabian Oil Company, Dhahran, SA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01V 1/36 (2006.01); E21B 47/00 (2012.01); G01V 1/46 (2006.01); G01V 1/50 (2006.01);
U.S. Cl.
CPC ...
G01V 1/368 (2013.01); E21B 47/00 (2013.01); G01V 1/46 (2013.01); G01V 1/50 (2013.01); G01V 2210/1234 (2013.01);
Abstract
The present disclosure describes methods and systems for estimating dispersion spectra for full waveform sonic (FWS) logging. One computer-implemented method includes receiving FWS data, performing frequency-spatial (FX) transform on the FWS data, using a nonstationary predictive error filtering (PEF) inversion on the transformed FWS data to estimate local matrix L and matrix P, calculating an inverse covariance matrix based on the estimated local matrix L and matrix P, and obtaining a nonstationary maximum likelihood method (MLM) spectra based on the inverse covariance matrix.