US 12,282,135 B2
Nuclear magnetic resonance based Archie parameter determination
Gabriela Singer, Richmond, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Nov. 16, 2021, as Appl. No. 17/455,157.
Prior Publication US 2023/0152483 A1, May 18, 2023
Int. Cl. G01V 3/14 (2006.01); E21B 49/00 (2006.01); G01V 3/38 (2006.01)
CPC G01V 3/14 (2013.01) [E21B 49/00 (2013.01); G01V 3/38 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
determining, via a Nuclear Magnetic Resonance (NMR) logging instrument, a first NMR response of a subsurface formation that is based on an NMR response signal that traversed through the subsurface formation as a result of a magnetic field being emitted into the subsurface formation;
generating, during a wellbore operation, an NMR diffusion relaxation distribution map based, at least in part, on the first NMR response;
determining a value of a surface relaxivity of the subsurface formation, wherein determining the value of the surface relaxivity comprises determining a roughness corrected surface relaxivity of the subsurface formation based on a Brunauer, Emmett, and Teller (BET) surface relaxivity, a T2 distribution, and a Laser Confocal Scanning Microscope (LSCM) surface roughness measurement;
determining an Archie cementation exponent for an Archie equation based on both the NMR diffusion relaxation distribution map and the roughness corrected surface relaxivity, wherein determining the Archie cementation exponent comprises determining the Archie cementation exponent based on a D-T2 fit line;
determining a property of the subsurface formation using the Archie cementation exponent determined based on both the NMR diffusion relaxation distribution map and the roughness corrected surface relaxivity; and
adjusting the wellbore operation for a wellbore that is formed in the subsurface formation based on the property.