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

Claim 0:
1. A method comprising:
determining a porosity of a core sample, wherein the core sample has a permeability of 10 milliDarcy (mD) or less;
saturating the core sample with a nuclear magnetic resonance (NMR) saturation fluid to achieve a saturated core sample;
taking a first NMR measurement of fluids in the saturated core sample;
hydraulically exchanging a fluid in the saturated core sample with a NMR exchange fluid;
taking a second NMR measurement of the saturated core sample after hydraulic exchange; and
deriving a volume for pore types based on a correlation between the first NMR measurement, the second NMR measurement and a NMR signal to fluid volume calibration, wherein the volume for pore types identifies an amount of water disposed in nanopores of the saturated core sample relative to macropores of the saturated core sample; and
developing a production plan based on the amount of water disposed in nanopores of the saturated core sample relative to macropores of the saturated core sample.