Well Log QC Checklist: N-D, M-N, GR-Density Crossplots + Environmental Corrections
Systematic QC for every curve in your log suite: quality ratings and range flags computed from the data, depth coverage and casing-shoe checks, N-D, M-N and GR-density crossplots, histograms, and an environmental corrections checklist.
TAGLINE
Systematic QC for every curve in your log suite: quality ratings and range flags computed from the data, depth coverage and casing-shoe checks, N-D, M-N and GR-density crossplots, histograms, and an environmental corrections checklist.
WHO IT'S FOR
Petrophysicists and log analysts who need a documented, reproducible QC workflow before starting formation evaluation.
WHAT IT DOES
Rates each curve Good/Fair/Poor from its data and your thresholds (out of range, bad hole from the caliper, sonic cycle skip), flags curves outside their expected ranges, and checks zone coverage against the logged interval, TD and the casing shoe. Flags fluid effects at each station from the neutron-density separation, with bad-hole stations marked unreliable. Plots the Neutron-Density, M-N lithology and GR-Density crossplots and histograms of GR, RHOB, NPHI and CALI from one set of 30 depth stations. The QC summary, analyst notes and correction flags are generated from the computed results.
TABS INCLUDED (10)
• Instructions • Log Run QC — 8-curve table with Good/Fair/Poor ratings, range flags, bad-hole and cycle-skip notes • Depth & Coverage QC — log top/bottom vs TD, zone coverage (full/partial), casing-shoe check • N-D Crossplot — 30 stations: RHOB vs NPHI by GR class, density and neutron porosity, fluid flag from neutron-density separation • Curve Statistics — min, max, mean, median, P10, P90, std dev and QC status per curve; histograms • QC Flag Summary — Good/Fair/Poor and out-of-range counts; generated analyst notes • QC Report — one-page summary for the file • M-N Lithology Plot — M and N per station vs five mineral endpoints, nearest-mineral lithology flag • GR-Density Crossplot — GR vs RHOB with IGR, Larionov (Tertiary) Vshale and clean–shale line • Environmental Corrections — borehole, salinity, gas, temperature checklist with flags from the data
KEY FEATURES
• N-D crossplot: fluid flag from density vs neutron porosity separation (thresholds are inputs); sandstone, limestone and dolomite lines • M-N plot: M = 0.01·(Δtf − Δt)/(ρb − ρf), N = (φNf − φN)/(ρb − ρf); 5 mineral endpoints (sandstone, limestone, dolomite, anhydrite, gypsum) • Quality and out-of-range flags per curve from the data and expected min/max • Environmental corrections: RHOB borehole, NPHI salinity & gas, RT shoulder bed, DT cycle-skip; BHT from surface temperature and gradient
TECHNICAL SPECS
• Excel 2016+ compatible — no add-ins required • 1,300+ formulas across 10 tabs • Sample dataset with 30 log depth stations included • MDT color scheme: input cells blue, calculated grey
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.
