NMR Log Interpretation Workbook: T2 Distribution, BVI/FFI & Coates Permeability
Interpret NMR T2 distributions: partition clay-bound, capillary-bound (BVI) and free-fluid (FFI) porosity, estimate permeability with Coates and SDR models, and QC against conventional porosity.
TAGLINE
Interpret NMR T2 distributions: partition clay-bound, capillary-bound (BVI) and free-fluid (FFI) porosity, estimate permeability with Coates and SDR models, and QC against conventional porosity.
WHO IT'S FOR
Formation evaluation engineers and petrophysicists interpreting NMR logs for porosity partitioning and permeability estimation.
WHAT IT DOES
Accepts T2 bin amplitudes, applies clay-bound and capillary-bound cutoffs, calculates Coates, Timur and SDR permeability (SDR from the log-mean T2), and builds a depth-log summary. NMR porosity comes from the scaled amplitudes, so the QC against conventional porosity is a real comparison.
TABS INCLUDED (11)
• Instructions & Legend • Assumptions — T2 cutoffs and model constants • T2 Input — bin amplitudes with cumulative • Porosity Partition — CBW / BVI / FFI, effective porosity, T2 log mean • Permeability Estimates — Coates, Timur, SDR • Depth Log — station summary • Porosity QC Crossplot — NMR vs conventional with 1:1 • BVI vs FFI Crossplot — partition by station • Permeability QC Crossplot — Coates vs SDR k • BVI FFI Bar Chart — partition summary • Summary & QC
KEY FORMULAS
BVI = amplitude between the clay-bound and T2 cutoffs; Coates k = 10⁴·φe⁴·(FFI/BVI)²; SDR k = 4·φ⁴·T2LM²; T2LM = exp(Σ amp·ln T2 / Σ amp)
TECHNICAL SPECS
• Excel 2016+; 390+ formulas; 11-bin T2 sample; crossplots & charts included • MDT professional color scheme throughout • Yellow cells = inputs; white cells = formulas
ABOUT RESERVOIR RISK SOLUTIONS
Built by petroleum engineers for petroleum engineers. All workbooks require only Microsoft Excel (2016+) — no plugins, no subscriptions. www.reservoir-risk-solutions.com
What you get
- Instant workbook access after payment in your Excel Library
- Formula-driven worksheet designed for petroleum workflows
- No recurring fees and no plugin requirements
Licence
Single-user licence: the purchaser may use and modify this workbook for their own work, including work for their employer and clients. It may not be resold, shared publicly or redistributed as a template. Results are engineering estimates for screening and must be checked by a qualified professional before they are relied on.
FAQ
Is this a one-time purchase?
Yes. Each workbook is sold as a one-time purchase with no recurring subscription.
How do I access purchased files?
After checkout, your file appears in Excel Library under your account for download.
Do these templates require macros or plugins?
No. Templates are designed for Excel 2016+ and do not require VBA macros or external add-ins.
