NMR processing & interpretation

Full NMR workflow — from raw echo data and joint inversion to the T2 distribution and the resulting porosity, permeability and capillary-pressure curves.

Raw data and inversion

• Preprocessing of raw NMR data — echo-train conditioning.
• Joint 1D NMR inversion — simultaneous inversion of the measured echoes.
• T2 array formation and T2 recording limits — define the T2 grid used downstream.

Interpretation

• Porosity from NMR — total and effective porosity referenced to the T2 cutoff.
• Permeability from NMR — bound/free-fluid based transforms.
• Capillary curves from NMR — capillary-pressure curves derived from the T2 distribution.

Outputs

• Pore-size distribution and its separation into bound and free fluid — directly usable for completion design.
• Applications in tight sands and carbonates where standard methods cannot resolve the pore system.

This page summarises the NMR section of the Wellbore.AI / Gamma technical manual.

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