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US 12,282,135 B2Granted
Nuclear magnetic resonance based Archie parameter determination
AssigneeHalliburton Energy Services, Inc.
InventorGabriela Singer
Life of this patent
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Abstract
A method comprises determining a Nuclear Magnetic Resonance (NMR) response of a subsurface formation that is based on an NMR response signal that traversed through the subsurface formation and that is result of a magnetic field being emitted into the subsurface formation; determining an Archie cementation exponent for an Archie equation based on the NMR response; and determining a property of the subsurface formation based on the Archie cementation exponent.
Claims20
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.
4 more elements
One or more non-transitory machine-readable storage media including instructions executable by a processor, the instructions comprising:
- instructions to determine, 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 and that is a result of a magnetic field being emitted into the subsurface formation;
- instructions to generate, during a wellbore operation, an NMR diffusion relaxation distribution map based, at least in part, on the first NMR response;
- instructions to determine a value of a surface relaxivity of the subsurface formation, wherein the instructions to determine the value of the surface relaxivity comprise instructions to determine 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;
- instructions to determine an Archie cementation exponent for an Archie equation based on both the NMR diffusion relaxation distribution map and the roughness corrected surface relaxivity, wherein the instructions to determine the Archie cementation exponent comprise instructions to determine the Archie cementation exponent based on a D-T2 fit line;
- instructions to determine 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
- instructions to adjust the wellbore operation for a wellbore that is formed in the subsurface formation based on the determined property.
4 more elements
A system comprising:
- a Nuclear Magnetic Resonance (NMR) logging tool to be positioned in a wellbore formed in a subsurface formation, the NMR logging tool to detect an NMR response signal that traversed through the subsurface formation and that is result of a magnetic field being emitted into the subsurface formation;
- a processor;
- and
- a machine-readable storage medium including instructions executable by the processor, the instructions comprising:
- instructions to control the NMR logging tool to determine a first NMR response of the subsurface formation based on the NMR response signal;
- instructions to generate, during a wellbore operation, an NMR diffusion relaxation distribution map based, at least in part, on the first NMR response;
- instructions to determine a value of a surface relaxivity of the subsurface formation, wherein the instructions to determine the value of the surface relaxivity comprise instructions to determine 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;
- instructions to determine an Archie cementation exponent for an Archie equation based on both the NMR diffusion relaxation distribution map and the roughness corrected surface relaxivity of the subsurface formation, wherein the instructions to determine the Archie cementation exponent comprise instructions to determine the Archie cementation exponent based on a D-T2 fit line;
- instructions to determine 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
- instructions to adjust the wellbore operation for the wellbore that is formed in the subsurface formation based on the determined property.
8 more elements
Dependencies are inferred from the claim text.