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 |
A | Low density shale |
B | Heavy metals |
C | Organic rich black shale |
D | Coal |
E | Shaly sandstone |
Question 2 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | Between 1047 m and 1060 m |
B | Between 1049 m and 1055 m |
C | Between 1066 m and 1071 m |
D | Between 1066 m and 1078 m |
E | Between 1071 m and 1078 m |
Question 3 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Shale |
B | Dolomitic pelmicrite |
C | Limy dolomite |
D | Shaly sandstone |
E | Quartz arenite |
Question 4 |
A | At around 2102 m of depth |
B | At around 2177 m of depth |
C | At around 2110 m of depth |
D | At around 2158 m of depth |
E | At around 2105 m of depth |
Question 5 |
A | Oil (petroleum) |
B | Low density bitumen |
C | Natural gas |
D | Fresh water |
E | Brine water |
Question 6 |
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 | Clean sand |
D | Carbonaceous sandstone |
E | Limestone with sand interbeds |
Question 7 |
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 ~1025 m and ~1028 m |
D | Between ~1042 m and ~1043 m |
E | Between ~1070 m and ~1078 m |
Question 8 |
Original at: image log; Borehole image log analysis for sedimentary environment and clay volume interpretation by A. Shahinpour (NTUN) 2013
A | It is impossible to determine. |
B | Fracture 3, 8 and 9 |
C | Fracture 4, 6 and 7 |
D | Fracture 5 and 6 |
E | Fracture 4 and 5 |
Question 9 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-whatisalog.htm
A | Coal bearing formation |
B | High porosity formation |
C | High concentration of gas ("gas effect") |
D | Sandstone formation |
E | Presence of hydrocarbons |
Question 10 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Dolomite |
B | Limestone |
C | Glauconitic Sandstone |
D | Anhydrite |
E | Sandstone |
Question 11 |
A | At around 2145m of depth |
B | At around 2158 m of depth |
C | At around 2102 m of depth |
D | At around 2110 m of depth |
E | At around 2180 m of depth |
Question 12 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Shale |
B | Seal |
C | Caprock |
D | Mudstone |
E | Sandtone |
Question 13 |
A | Just below position II |
B | At position I |
C | Just above position II |
D | Just above position I |
E | At position III |
Question 14 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/30-tmprlog.htm
A | 9640 ft |
B | 9540 ft |
C | 9500 ft |
D | 9600 ft |
E | 958 0ft |
Question 15 |
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 1 and 2 |
B | Fracture 4 and 5 |
C | Fracture 4 |
D | Fracture 7 |
E | Fracture 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 | Limestone |
B | Dolomite |
C | Argillaceous limestone |
D | Shale |
E | Calcite |
F | Anhydrite |
Question 17 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/18-shalegas.htm
A | Water invaded zone |
B | Oil saturated zone |
C | Coal seam regions |
D | Gas saturated zone |
E | Water saturated zone |
Question 18 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Shale |
B | Argillaceous limestone |
C | Argillaceous dolomite |
D | Dolomite |
E | Calcite |
F | Anhydrite |
Question 19 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/07-eslog.htm
A | Around 422 m of depth |
B | Around 460 m of depth |
C | Around 451 m of depth |
D | Around 465 m of depth |
E | Around 470 m of depth |
Question 20 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Channel point bar deposit |
B | Slope channel deposit |
C | Interbeds of coal and sand |
D | Transgressive marine shelf |
E | Prograding marine shelf |
Question 21 |
Image credit: United States Geological Survey, online at USGS database
A | High pressure due to increased in depth |
B | Intentionally changed the drill bit |
C | Drilling mud infiltration |
D | Borehole collapse |
E | Soft lithological facies |
Question 22 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | 2047 m (+/- 5m) |
B | 2047 m (+/- 5m) |
C | 2057 m (+/- 5m) |
D | 2077 m (+/- 5m) |
E | 2090 m (+/- 5m) |
Question 23 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | ~1.0 |
B | 0.0 |
C | ~75 |
D | ~0.38 |
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 24 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/22-fracloc5.htm
A | Effective porosity |
B | Lithological contacts |
C | Bedding contacts |
D | Hydrocarbon saturated zones |
E | Coal seams |
F | Fractures |
Question 25 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/30-tmprlog.htm
A | Between 9550 ft to 9650 ft. |
B | From KB down to 9500 ft. |
C | From KB down to 9600 ft. |
D | Between 9500 ft and 9600 ft. |
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 2890 m and 2895 m |
B | Between 2970 m and 3075 m |
C | Between 2945 m and 2970 m |
D | At 3075 m |
E | Between 3075 m and 3085 m |
Question 27 |
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 28 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Between ~1070 m and ~1078 m |
B | Between ~1042 m and ~1043 m |
C | Between ~1066 m and ~1071 m |
D | Between ~1066 m and ~1078 m |
E | Between ~1025 m and ~1028 m |
Question 29 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Tight oil |
B | Signal interference or poor tool calibration |
C | Inaccuracies in measurements due to mud infiltration |
D | Poor tool pads in the well |
E | Borehole collapse |
Question 30 |
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 31 |
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 | ~ 0.27 |
C | ~ 0.24 |
D | ~ 0.36 |
E | ~ 0.48 |
Question 32 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | At 1067 m |
B | At 1027 m |
C | At 1046.5 m |
D | At 1079 m |
E | At 1023 m |
Question 33 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Gas-bearing calcite |
B | Shaly sandstone |
C | Gas-bearing dolomite |
D | Feldspatic (K-spar rich) arenite |
E | Gas-bearing sandstone |
F | Shale interbeded sandstone |
Question 34 |
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 | 40 degrees Southeast |
C | 50 degrees Southeast |
D | 30 degrees Northwest |
E | 150 degrees Northwest |
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 414 m , 422 m , 464 m , 470 m and 477 m |
B | At around 412 m , 414 m , 422 m , 470 m and 475 m |
C | At around 414 m , 451 m , 457 m , 464 m and 475 m |
D | At around 416 m , 451 m , 457 m , 470 m and 475 m |
E | At around 416 m , 451 m , 464 m , 470 m and 475 m |
Question 36 |
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 3095 m |
D | At 2995 m |
E | At 2955 m |
Question 37 |
A | Coal |
B | Interbedded clean sandstone and shale |
C | Shale |
D | Clean limestone |
E | Sandstone |
Question 38 |
A | Glauconitic sandstone |
B | Interbeds of clean sand with shale |
C | Organic rich black shale |
D | Gas bearing sandstone |
E | Heavy metals |
Question 39 |
A | Super-fan depositional lobes |
B | Slope channel |
C | Braided channel |
D | Channel-point bar |
E | Trangessive marine shelf |
F | Prograding delta |
Question 40 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Sandstone |
B | Dolomite |
C | Anhydrite |
D | Limestone |
E | Shale |
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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.