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Real-World Petrophysics Training
Three Day Training Course
Course includes manual, PPL_quick-look.xls, charts, equations, check lists, abbreviations, worked examples and course slides.
Day1 What makes a reservoir rock? Mudlogs: Cuttings, total gas, chromatograph, cut & fluorescence Micropractical: Locate reservoir on mudlog
LWD and Conventional logs: GR, Caliper, Resistivity, Density, Neutron, Sonic, SP, NMR: - Basic operating principles, resolution - LWD problems and differences with wireline - Typical log plots of non-reservoir, reservoir and pay - Key qualitative features of logs in reservoir and pay
Log summary table: tool, principle, curves, function Practical. For each tool: Test on operating principles. Role in identifying reservoir.
Qualitative Quick Look - GR and shaliness, DN crossover and reservoir quality - Resistivity in water and HC zones - Resistivity porosity trends in water vs. HC zones - Invasion profiles - How shaliness obscures reservoirs
Practical. Identify reservoir rock from conventional logs using visual clues Distinguish pay from reservoir rock using visual clues List characteristics which are 1) present and 2) absent on mudlogs for a) reservoir b) pay
Day2 Recap, Course Progression, What's next, Questions Quantitative Quick Look Using Charts Identification of Reservoir rock and Pay with Explanation GR logs and vshale Using density-neutron crossplot for porosity and shaliness Practical. As above
Chart Gen-9 for Rw Why water zones are useful Pickett plots for aRw and m to define the water saturated condition Chart Sw-1 for Sw Practical. As above
Chart K-4 for permeability Do mudlogs support our findings? Practical. As above
Problems Common problems, how to recognize them and what to do: Badhole, Non GR fines and GR non-fines, Low porosity reservoirs with mineral variations and diagenesis, Shaly gas zones, Lack of water samples or water zones (Rw variations), Is Chart K-4 applicable?
Recap: volumetric inputs: porosity, saturation, pay thickness and permeability
Common Geological Features: Their Appearance on Conventional Logs and Mudlogs - Shaliness - Fining sequences -Thin beds - Bioturbated and convoluted beds - Cementation - Authigenic clays - Carbonates - Volcanics - Conglomerates - Faults - Solid hydrocarbons - Rw variations - Over pressure
Day3 Recap, Course Progression, What's next, Questions Wireline Formation Testers (WFTs) Quick operating principles Pressure tvdss plots: fluid type; contacts; reservoir separation Distinguishing good and bad pressure data How to acquire good pressure data
Practical. Distinguish good and pressure bad data Plot and identify fluid type and contacts Add a second well Your conclusions about this well are?
WFTs contd. Reservoir samples and permeability (movie) Compare and contrast WFTs and Well Tests (DSTs) Practical. Locate pressure and sampling points on log Distinguish good and bad reservoir fluid samples
The Petrophysics Pty Ltd Quick Look Log Analysis spreadsheet - GR vshale, - Density porosity, - Density-neutron porosity, - Rwa, - The Archie equation, - Coates Permeability (tvdss defaults), - Netpay and Netrock Cut-offs
Recap Key Equations List Practical. Calculations from log plots as above. One well vs. a second well
Optional InHouse Student Directed, Instructor performed Quick Log Analysis using Geolog Key Well (or client supplied key well)
Quality Control Do vertical trends of shaliness, porosity and bulk volume water make sense? Do mudlogs and well tests make sense?
Common Problems When to be cautious with logs and how to avoid the common pitfalls Practical. Identification of log problems. What to do
Check list for Petrophysical Results before their use in reserves or reservoir simulation
Extras LWD: Summary of differences with wireline logs. What to watch for Special Logs: Output and role in The Big Picture, More on NMR Logs (movie), Image Logs (movie), Sonic Logs (movie)
Practical. Quicklook evaluation mudlogs, vshale, porosity, Rw, Sw WFT contacts
Summary of Associated Topics. This Course and The Big Picture - Routine Core Analysis, - Special Core Analysis, - Capillary pressure, - Electrical properties, - Relative permeability, - Saturation-height modeling, - Seismic Petrophysics, - Facies Identification, - Geological Modeling
Glossary Curve and Tool Abbreviations
Course Recap How to relax and feel confident and what key words/sentences you must say when friends and colleagues start talking "Logs" and "Petrophysics" at the water cooler, or even at the bar on Friday night.
Lets face it, you just can't miss this one!
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