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:
Aug. 27, 2013
Filed:
Jun. 09, 2010
Chanh Cao Minh, Katy, TX (US);
Marie Laure Mauborgne, Fontenay aux Roses, FR;
Roger Griffiths, Schaffhausen, CH;
Darwin Ellis, Ridgefield, CT (US);
Chanh Cao Minh, Katy, TX (US);
Marie Laure Mauborgne, Fontenay aux Roses, FR;
Roger Griffiths, Schaffhausen, CH;
Darwin Ellis, Ridgefield, CT (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
The present disclosure relates to a method to determine the capture cross-section of a subsurface formation at a desired depth in the formation. A database of Sigma values for known lithologies, porosities, and salinities is provided, and multiple Sigma measurements are obtained from a downhole logging tool. Within the database, Sigma values are interpolated to determine the respective depths of investigation of the multiple Sigma measurements. A monotonic function is fitted to the multiple Sigma measurements at the determined depths of investigation, and the capture cross-section of the subsurface formation at any desired depth in the formation is determined using the fitted function. Similarly, a system to determine the capture cross-section of a subsurface formation at a desired depth in the formation and/or a depth of invasion of drilling fluids is also disclosed.