Warning!
All log images are copyrighted and have been reproduced on this site with permission. The original copyright holder is not, Sanuja Senanayake.Petrophysical (Well) Log Interpretation or Petrophysics Log Interpretation is a specialized area of science that deals with borehole data. In Canada, it is typically taught with physical core log interpretation and other geological and engineering fundamental concepts in most universities. Technical educational institutions and professional organizations offer courses in well log interpretation as a stand along subject. You can learn in depth at CRAIN’S PETROPHYSICAL HANDBOOK (www.spec2000.net). This page is best viewed on desktop computers due to small font size in well logs.
Disclaimer: While every reasonable effort is made to ensure that the information provided is accurate, no guarantees for the currency or accuracy of information are made. It takes several proof readings and rewrites to bring the quiz to an exceptional level. If you find an error, please contact me as soon as possible. Please indicate the question ID-Number or description because server may randomize the questions and answers.
Petrophysical Log Interpretation
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Question 1 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Shale interbeded sandstone |
B | Gas-bearing calcite |
C | Shaly sandstone |
D | Gas-bearing sandstone |
E | Gas-bearing dolomite |
F | Feldspatic (K-spar rich) arenite |
Question 2 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/18-shalegas.htm
A | Between 1203 m to 1239.5 m |
B | Between 1209.5 m to 1211.5 m |
C | Between 1211.5 m to 1239.5 m |
D | Between 1212.5 m to 1223.5 m |
Question 3 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/22-fracloc5.htm
A | Fractures |
B | Bedding contacts |
C | Effective porosity |
D | Hydrocarbon saturated zones |
E | Lithological contacts |
F | Coal seams |
Question 4 |
Original at: schematic diagram; http://www.google.com/patents/US20110064277
image log; Borehole image log analysis for sedimentary environment and clay volume interpretation by A. Shahinpour (NTUN) 2013
A | Fracture 4 |
B | Fracture 8 and 9 |
C | Fracture 7 |
D | Fracture 1 and 2 |
E | Fracture 4 and 5 |
Question 5 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | 0.0 |
B | ~0.38 |
C | ~1.0 |
D | ~75 |
E | ~0.013 |
Net sand interval = 3075 m - 3000 m = 75 m (read off the GR curve)
Hence, net:gross = 75 m/75 m = 1.0
Question 6 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Shale |
B | Sandstone |
C | Dolomite |
D | Limestone |
E | Anhydrite |
Question 7 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/22-fracloc5.htm
A | 60 degrees Southeast |
B | 50 degrees Southeast |
C | 150 degrees Northwest |
D | 40 degrees Southeast |
E | 30 degrees Northwest |
Question 8 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Argillaceous limestone |
B | Anhydrite |
C | Shale |
D | Dolomite |
E | Calcite |
F | Argillaceous dolomite |
Question 9 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/30-tmprlog.htm
A | 9540 ft |
B | 9600 ft |
C | 9500 ft |
D | 958 0ft |
E | 9640 ft |
Question 10 |
A | Fresh water |
B | Low density bitumen |
C | Oil (petroleum) |
D | Natural gas |
E | Brine water |
Question 11 |
A | Sandstone |
B | Clean limestone |
C | Coal |
D | Interbedded clean sandstone and shale |
E | Shale |
Question 12 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/18-shalegas.htm
A | Gas saturated zone |
B | Water saturated zone |
C | Oil saturated zone |
D | Coal seam regions |
E | Water invaded zone |
Question 13 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | At 1023 m |
B | At 1046.5 m |
C | At 1079 m |
D | At 1067 m |
E | At 1027 m |
Question 14 |
A | At position III |
B | At position I |
C | Just above position I |
D | Just above position II |
E | Just below position II |
Question 15 |
Original at: image log; Borehole image log analysis for sedimentary environment and clay volume interpretation by A. Shahinpour (NTUN) 2013
A | Fracture 4, 6 and 7 |
B | Fracture 4 and 5 |
C | It is impossible to determine. |
D | Fracture 5 and 6 |
E | Fracture 3, 8 and 9 |
Question 16 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | At 2893 m |
B | At 3011 m |
C | At 2955 m |
D | At 2995 m |
E | At 3095 m |
Question 17 |
A | Coal |
B | Low density shale |
C | Shaly sandstone |
D | Heavy metals |
E | Organic rich black shale |
Question 18 |
A | At around 2180 m of depth |
B | At around 2110 m of depth |
C | At around 2145m of depth |
D | At around 2158 m of depth |
E | At around 2102 m of depth |
Question 19 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | Dolomite with clay interbeds |
B | Dolomite |
C | Limestone with sand interbeds |
D | Carbonaceous sandstone |
E | Clean sand |
Question 20 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Interbeds of coal and sand |
B | Prograding marine shelf |
C | Transgressive marine shelf |
D | Slope channel deposit |
E | Channel point bar deposit |
Question 21 |
A | Channel-point bar |
B | Trangessive marine shelf |
C | Braided channel |
D | Slope channel |
E | Super-fan depositional lobes |
F | Prograding delta |
Question 22 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/07-eslog.htm
A | Around 470 m of depth |
B | Around 451 m of depth |
C | Around 465 m of depth |
D | Around 422 m of depth |
E | Around 460 m of depth |
Question 23 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Between ~1066 m and ~1071 m |
B | Between ~1066 m and ~1078 m |
C | Between ~1070 m and ~1078 m |
D | Between ~1042 m and ~1043 m |
E | Between ~1025 m and ~1028 m |
Question 24 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Signal interference or poor tool calibration |
B | Borehole collapse |
C | Inaccuracies in measurements due to mud infiltration |
D | Poor tool pads in the well |
E | Tight oil |
Question 25 |
A | Interbeds of clean sand with shale |
B | Gas bearing sandstone |
C | Glauconitic sandstone |
D | Organic rich black shale |
E | Heavy metals |
Question 26 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Between 3075 m and 3085 m |
B | Between 2890 m and 2895 m |
C | Between 2945 m and 2970 m |
D | Between 2970 m and 3075 m |
E | At 3075 m |
Question 27 |
A | At around 2177 m of depth |
B | At around 2110 m of depth |
C | At around 2102 m of depth |
D | At around 2158 m of depth |
E | At around 2105 m of depth |
Question 28 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | ~ 0.18 |
B | ~ 0.48 |
C | ~ 0.24 |
D | ~ 0.36 |
E | ~ 0.27 |
Question 29 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Dolomitic pelmicrite |
B | Quartz arenite |
C | Shaly sandstone |
D | Shale |
E | Limy dolomite |
Question 30 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | 2047 m (+/- 5m) |
B | 2090 m (+/- 5m) |
C | 2057 m (+/- 5m) |
D | 2047 m (+/- 5m) |
E | 2077 m (+/- 5m) |
Question 31 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/07-eslog.htm
A | AT10 (black line) |
B | It is difficult to determine with the given log. |
C | AT30 (dashed blue line) |
D | AT90 (dashed red line) |
Question 32 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Between ~1066 m and ~1078 m |
B | Between ~1066 m and ~1071 m |
C | Between ~1025 m and ~1028 m |
D | Between ~1070 m and ~1078 m |
E | Between ~1042 m and ~1043 m |
Question 33 |
Image credit: United States Geological Survey, online at USGS database
A | Intentionally changed the drill bit |
B | Borehole collapse |
C | Soft lithological facies |
D | Drilling mud infiltration |
E | High pressure due to increased in depth |
Question 34 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-whatisalog.htm
A | High porosity formation |
B | Presence of hydrocarbons |
C | Coal bearing formation |
D | High concentration of gas ("gas effect") |
E | Sandstone formation |
Question 35 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/07-eslog.htm
A | At around 416 m , 451 m , 464 m , 470 m and 475 m |
B | At around 412 m , 414 m , 422 m , 470 m and 475 m |
C | At around 414 m , 422 m , 464 m , 470 m and 477 m |
D | At around 416 m , 451 m , 457 m , 470 m and 475 m |
E | At around 414 m , 451 m , 457 m , 464 m and 475 m |
Question 36 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/30-tmprlog.htm
A | Between 9500 ft and 9600 ft. |
B | From KB down to 9500 ft. |
C | Between 9550 ft to 9650 ft. |
D | From KB down to 9600 ft. |
Question 37 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Seal |
B | Sandtone |
C | Caprock |
D | Shale |
E | Mudstone |
Question 38 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Dolomite |
B | Anhydrite |
C | Glauconitic Sandstone |
D | Limestone |
E | Sandstone |
Question 39 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | Between 1066 m and 1071 m |
B | Between 1047 m and 1060 m |
C | Between 1049 m and 1055 m |
D | Between 1071 m and 1078 m |
E | Between 1066 m and 1078 m |
Question 40 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Calcite |
B | Argillaceous limestone |
C | Shale |
D | Limestone |
E | Anhydrite |
F | Dolomite |
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Credits: Based on the excellent class notes provided by, Dr. Rudi Meyer during Fall 2014 and the generous support from CRAIN’S PETROPHYSICAL HANDBOOK (spec2000.net) by supplying the petrophysical well log images. Some of the welllogs are produced by E.R. Crain, P.Eng. Those logs obtianed from E.R. Crain is the copyrighted intellectual property of the author.
FAQ | Report an Error
Supplementary Materials
Petrophysical Techniques; Geology/Geophysics (449)
Introduction to Petroleum Geology (577)
CRAIN’S PETROPHYSICAL HANDBOOK (www.spec2000.net)
If you are a company or an organization willing to donate copies of well logs, please contact me. I really appreciate your contributions and proper credits will be provided.