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 | At around 2158 m of depth |
B | At around 2177 m of depth |
C | At around 2102 m of depth |
D | At around 2110 m of depth |
E | At around 2105 m of depth |
Question 2 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | At 3011 m |
B | At 3095 m |
C | At 2893 m |
D | At 2995 m |
E | At 2955 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 | Prograding marine shelf |
B | Interbeds of coal and sand |
C | Transgressive marine shelf |
D | Channel point bar deposit |
E | Slope channel deposit |
Question 4 |
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 470 m of depth |
C | Around 460 m of depth |
D | Around 465 m of depth |
E | Around 451 m of depth |
Question 5 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Signal interference or poor tool calibration |
B | Inaccuracies in measurements due to mud infiltration |
C | Tight oil |
D | Poor tool pads in the well |
E | Borehole collapse |
Question 6 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Sandstone |
B | Dolomite |
C | Limestone |
D | Anhydrite |
E | Glauconitic Sandstone |
Question 7 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/07-eslog.htm
A | AT90 (dashed red line) |
B | It is difficult to determine with the given log. |
C | AT30 (dashed blue line) |
D | AT10 (black line) |
Question 8 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | At 1046.5 m |
B | At 1067 m |
C | At 1079 m |
D | At 1027 m |
E | At 1023 m |
Question 9 |
A | At position I |
B | Just below position II |
C | At position III |
D | Just above position II |
E | Just above position I |
Question 10 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | 2090 m (+/- 5m) |
B | 2057 m (+/- 5m) |
C | 2047 m (+/- 5m) |
D | 2047 m (+/- 5m) |
E | 2077 m (+/- 5m) |
Question 11 |
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 | Clean sand |
C | Carbonaceous sandstone |
D | Dolomite |
E | Limestone with sand interbeds |
Question 12 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Between ~1025 m and ~1028 m |
B | Between ~1070 m and ~1078 m |
C | Between ~1066 m and ~1071 m |
D | Between ~1042 m and ~1043 m |
E | Between ~1066 m and ~1078 m |
Question 13 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/22-fracloc5.htm
A | 40 degrees Southeast |
B | 60 degrees Southeast |
C | 50 degrees Southeast |
D | 30 degrees Northwest |
E | 150 degrees Northwest |
Question 14 |
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 | ~75 |
C | ~0.013 |
D | ~0.38 |
E | 0.0 |
Net sand interval = 3075 m - 3000 m = 75 m (read off the GR curve)
Hence, net:gross = 75 m/75 m = 1.0
Question 15 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/18-shalegas.htm
A | Between 1211.5 m to 1239.5 m |
B | Between 1212.5 m to 1223.5 m |
C | Between 1203 m to 1239.5 m |
D | Between 1209.5 m to 1211.5 m |
Question 16 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | Between 1071 m and 1078 m |
B | Between 1066 m and 1078 m |
C | Between 1047 m and 1060 m |
D | Between 1066 m and 1071 m |
E | Between 1049 m and 1055 m |
Question 17 |
A | Natural gas |
B | Oil (petroleum) |
C | Brine water |
D | Low density bitumen |
E | Fresh water |
Question 18 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/22-fracloc5.htm
A | Fractures |
B | Hydrocarbon saturated zones |
C | Bedding contacts |
D | Effective porosity |
E | Lithological contacts |
F | Coal seams |
Question 19 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Feldspatic (K-spar rich) arenite |
B | Gas-bearing calcite |
C | Gas-bearing dolomite |
D | Gas-bearing sandstone |
E | Shale interbeded sandstone |
F | Shaly sandstone |
Question 20 |
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 | Dolomite |
C | Calcite |
D | Limestone |
E | Anhydrite |
F | Shale |
Question 21 |
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 7 |
B | Fracture 4 and 5 |
C | Fracture 4 |
D | Fracture 8 and 9 |
E | Fracture 1 and 2 |
Question 22 |
Image credit: United States Geological Survey, online at USGS database
A | High pressure due to increased in depth |
B | Soft lithological facies |
C | Drilling mud infiltration |
D | Borehole collapse |
E | Intentionally changed the drill bit |
Question 23 |
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 9600 ft. |
C | Between 9500 ft and 9600 ft. |
D | From KB down to 9500 ft. |
Question 24 |
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 | Calcite |
E | Anhydrite |
F | Dolomite |
Question 25 |
A | Glauconitic sandstone |
B | Interbeds of clean sand with shale |
C | Gas bearing sandstone |
D | Heavy metals |
E | Organic rich black shale |
Question 26 |
A | At around 2158 m of depth |
B | At around 2145m of depth |
C | At around 2110 m of depth |
D | At around 2180 m of depth |
E | At around 2102 m of depth |
Question 27 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/30-tmprlog.htm
A | 9600 ft |
B | 9500 ft |
C | 958 0ft |
D | 9640 ft |
E | 9540 ft |
Question 28 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | ~ 0.24 |
B | ~ 0.48 |
C | ~ 0.36 |
D | ~ 0.18 |
E | ~ 0.27 |
Question 29 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/18-shalegas.htm
A | Coal seam regions |
B | Water saturated zone |
C | Oil saturated zone |
D | Gas saturated zone |
E | Water invaded zone |
Question 30 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Between 2945 m and 2970 m |
B | At 3075 m |
C | Between 2890 m and 2895 m |
D | Between 3075 m and 3085 m |
E | Between 2970 m and 3075 m |
Question 31 |
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 | Sandstone formation |
C | High porosity formation |
D | High concentration of gas ("gas effect") |
E | Presence of hydrocarbons |
Question 32 |
A | Trangessive marine shelf |
B | Braided channel |
C | Prograding delta |
D | Channel-point bar |
E | Super-fan depositional lobes |
F | Slope channel |
Question 33 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Between ~1025 m and ~1028 m |
B | Between ~1066 m and ~1071 m |
C | Between ~1042 m and ~1043 m |
D | Between ~1070 m and ~1078 m |
E | Between ~1066 m and ~1078 m |
Question 34 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Mudstone |
B | Seal |
C | Sandtone |
D | Shale |
E | Caprock |
Question 35 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Limestone |
B | Dolomite |
C | Shale |
D | Sandstone |
E | Anhydrite |
Question 36 |
Original at: image log; Borehole image log analysis for sedimentary environment and clay volume interpretation by A. Shahinpour (NTUN) 2013
A | Fracture 3, 8 and 9 |
B | Fracture 4 and 5 |
C | Fracture 5 and 6 |
D | Fracture 4, 6 and 7 |
E | It is impossible to determine. |
Question 37 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Quartz arenite |
B | Dolomitic pelmicrite |
C | Shale |
D | Limy dolomite |
E | Shaly sandstone |
Question 38 |
A | Low density shale |
B | Heavy metals |
C | Organic rich black shale |
D | Shaly sandstone |
E | Coal |
Question 39 |
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 414 m , 422 m , 464 m , 470 m and 477 m |
C | At around 412 m , 414 m , 422 m , 470 m and 475 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 40 |
A | Sandstone |
B | Coal |
C | Shale |
D | Interbedded clean sandstone and shale |
E | Clean limestone |
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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.