Method to determine an uncorrupted nuclear magnetic resonance response from a sample

An NMR system, comprising:

• a pressure cell comprising a sealable open end, a closed end, and an interior volume;
• a volume of filler fluid configured to be introduced injected inside the interior volume of the pressure cell at a first temperature, wherein a filler fluid has a negligible NMR response;
• a sample, configured to be insertable into the pressure cell through the sealable open end and into the filler fluid at a second temperature, wherein the sample displaces an upper surface of filler fluid to a predetermined level within the interior volume of the pressure cell, wherein the predetermined level is located above a top NMR coil surface and below a top surface of the sample;
• an NMR pressure and injection system configured to establish a predetermined measurement pressure within the pressure cell;
• and
• an NMR control and data acquisition system configured to:
• determine an uncorrupted NMR response from the sample at the predetermined measurement pressure, and
• determine a reservoir characteristic of the sample based, at least in part, on the uncorrupted NMR response, wherein the reservoir characteristic comprises a porosity, a composition, a water and a hydrocarbon content, a permeability, or a behavior of an injected fluid.