NMR APPARATUS AND METHODS FOR MEASURING VOLUMES OF HYDROCARBON GAS AND OIL

摘要

A multifrequency method and apparatus for NMR logging. The apparatus and method uses a triple-wait-time (TWS1, TWS2, TWL1) NMR sequence to determine gas and light-oil filled porosity over a broad range of reservoir conditions. A set of conditions is derived for the selection of optimum acquisition parameters. The conditions are developed to aid in the selection of wait time combinations. <IMG>