NMR T2 distribution from simultaneous T1 and T2 inversions for geologic applications

US10061053B2 · kind B2 · utility

Assignee

• Baker Hughes, a GE company, LLC · US

Inventors

• Martin Blanz · Culham, GB
• Holger Thern · Hannover, DE
• Holger Tietjen · Hannover, DE
• Mouin Hamdan · Celle, DE
• Radu Coman · Hannover, DE

Key dates

• Filing date: Apr 30, 2015
• Grant date: Aug 28, 2018
• Expiry date: May 19, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/448
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for estimating a property of a subsurface material includes conveying a carrier through a borehole penetrating the subsurface material and performing an NMR measurement in a volume of interest in the subsurface material using an NMR tool having an antenna disposed at the carrier. The method further includes receiving with the antenna a short build-up signal due to a short magnetization build-up time of the NMR measurement, an echo-train signal with short polarization time due to the NMR measurement, and an echo-train signal with long polarization time due to the NMR measurement. The method further includes inverting, simultaneously, the short build-up signal, the short-polarization-time echo-train signal, and the long-polarization-time echo-train signal using a processor to estimate the property; and transmitting a signal comprising the property to a signal receiving device.