Methods of investigating formation samples using NMR data

US9939506B2 · kind B2 · utility

Assignee

• SCHLUMBERGER TECHNOLOGY CORPORATION · US

Inventors

• Lalitha Venkataramanan · Lexington, US
• Fred K. Gruber · Boston, US
• Tarek M. Habashy · Burlington, US
• Ridvan Akkurt · Lexington, US
• Badarinadh Vissapragada · Walpole, US
• Richard Evans Lewis, II · Saratoga, US
• Erik Rylander · Midland, US

Key dates

• Filing date: May 24, 2013
• Grant date: Apr 10, 2018
• Expiry date: May 22, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V3/38
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A methods are provided for investigating a sample containing hydrocarbons by subjecting the sample to a nuclear magnetic resonance (NMR) sequence using NMR equipment, using the NMR equipment to detect signals from the sample in response to the NMR sequence, analyzing the signals to extract a distribution of relaxation times (or diffusions), and computing a value for a parameter of the sample as a function of at least one of the relaxation times (or diffusions), wherein the computing utilizes a correction factor that modifies the value for the parameter as a function of relaxation time for at least short relaxation times (or as a function of diffusion for at least large diffusion coefficients).