Method for determining more accurate diffusion coefficient distributions of reservoir fluids using Bi-polar pulsed field gradients

For use in conjunction with a logging device downhole in an earth borehole, a method for determining a property of a substance in a downhole measurement region, comprising the steps of:

• providing a static magnetic field having a static magnetic field gradient in the measurement region;
• applying, in the measurement region, a pulse sequence that includes a tipping pulse, a re-focusing pulse, and a pulsed field gradient pulse train;
• wherein the pulsed field gradient pulse train includes a first portion and a second portion;
• the first portion comprising a first pulse or set of pulses having a first polarity and a second pulse or set of pulses having a second polarity, the second polarity being opposite to the first polarity, and wherein the first portion occurs before the re-focusing pulse;
• the second portion comprising a third pulse or set of pulses having the first polarity and a fourth pulse or set of pulses having the second polarity, and wherein the second portion occurs after the re-focusing pulse;
• and
• receiving one or more spin echoes from the measurement region.