Patent ID: 11898976
Assignee: EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 8:
9. A method comprising:
determining a porosity of a core sample, wherein the core sample has a permeability of 10 milliDarcy (mD) or less;
taking a first nuclear magnetic resonance (NMR) measurement of fluid in the core sample that is saturated;
diffusionally exchanging a first fluid in the saturated core sample in a NMR exchange fluid, wherein the first fluid is a hydrophobic fluid and the NMR exchange fluid is a hydrophobic NMR exchange fluid;
taking a first plurality of NMR measurements overtime of the fluid in the saturated core sample during diffusional exchange with the first NMR exchange fluid;
analyzing a pore connectivity based on the porosity, a NMR signal to fluid volume calibration, and a comparison between the first NMR measurement and the first plurality of NMR measurements, wherein when using the hydrophobic NMR exchange fluid the pore connectivity analysis includes pore types selected from the group consisting of a nanopore oil volume, a micropore oil volume, a macropore oil volume, and any combination thereof;
diffusionally exchanging a hydrophilic fluid in the saturated core sample in a hydrophilic NMR exchange fluid;
taking a second plurality of NMR measurements of the fluid in the saturated core sample during diffusional exchange with the hydrophilic NMR exchange fluid; and
deriving the pore connectivity analysis that further includes pore types selected from the group consisting of a nanopore water volume, a micropore water volume, a macropore water volume, and any combination thereof based on the porosity and a comparison between at least one of the first plurality of NMR measurements and the second plurality of NMR measurements.