Patent ID: 6512371
Filing Date: 2003-01-28
Classification: G01N,G01V,Y02A

Abstract:
A method for making nuclear magnetic resonance (NMR) measurements of a geologic formation using a NMR logging tool, comprising the steps of:(a) providing a static magnetic field in a volume of said formation; (b) applying a modified CPMG pulse sequence according to the expression: Wiâˆ’&pgr;/2âˆ’TDj/2âˆ’&pgr;âˆ’TDj/2âˆ’echoâˆ’[TE/2âˆ’&pgr;âˆ’TE/2âˆ’echo]k where Wi is a variable delay with i&gE;1; TDj is variable echo spacing, j&gE;1; TE/2 is the Carr-Purcell echo spacing, TDj>TE; k=1 , . . . , N; and (c) measuring the induced NMR echo signals.