SYSTEMS AND METHODS FOR FORMATION EVALUATION USING MAGNETIC RESONANCE LOGGING MEASUREMENTS

摘要

A method for obtaining formation measurements. The method includes deriving a pulse sequence and magnetizing a formation by applying a static magnetic field, via a nuclear magnetic resonance (NMR) system, to the formation. The method further includes applying the pulse sequence by: a) measuring a first spin echo train after waiting a first time period; b) measuring at least two spin echo trains subsequent to the first spin echo train, where the at least two spin echo trains include a wait time shorter than the first time period; and c) repeating b at least two times. The method additionally includes determining a T1 and a T2 based on inversions of the measuring the first spin echo train, the measuring the at least two spin echo trains, or a combination thereof, to determine a formation measurement.