A method for multiple echo trains jointing inversion of NMR relaxation measurements

A method for multiple echo trains jointing inversion of NMR measurement data sets is suggested in this paper. The availability of the method is proved by processing NMR porosity measurements data, multiple echo trains data sets with variable waiting time and variable echo spacing. The one-dimensional T2 distribution obtained by this method is not only smooth, it also shows subtle features in the short relaxation time. The accuracy of NMR porosity is improved. (T_2,T_1 ) or (T_2, D) two-dimensional distributions can be obtained by prodessing multiple echo trains with variable waiting time or variable echo spacing respectively. The results demonstrate the advantage of using two-dimensional NMR for fluid typing over conventional T_2 distribution.