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 |
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 2 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/30-tmprlog.htm
A | From KB down to 9500 ft. |
B | From KB down to 9600 ft. |
C | Between 9550 ft to 9650 ft. |
D | Between 9500 ft and 9600 ft. |
Question 3 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Argillaceous dolomite |
B | Argillaceous limestone |
C | Dolomite |
D | Anhydrite |
E | Calcite |
F | Shale |
Question 4 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | 2077 m (+/- 5m) |
B | 2047 m (+/- 5m) |
C | 2057 m (+/- 5m) |
D | 2047 m (+/- 5m) |
E | 2090 m (+/- 5m) |
Question 5 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | ~ 0.27 |
B | ~ 0.48 |
C | ~ 0.24 |
D | ~ 0.18 |
E | ~ 0.36 |
Question 6 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/07-eslog.htm
A | AT30 (dashed blue line) |
B | It is difficult to determine with the given log. |
C | AT90 (dashed red line) |
D | AT10 (black line) |
Question 7 |
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 | 9640 ft |
C | 9500 ft |
D | 9540 ft |
E | 958 0ft |
Question 8 |
A | Heavy metals |
B | Low density shale |
C | Organic rich black shale |
D | Shaly sandstone |
E | Coal |
Question 9 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/22-fracloc5.htm
A | Hydrocarbon saturated zones |
B | Coal seams |
C | Lithological contacts |
D | Bedding contacts |
E | Fractures |
F | Effective porosity |
Question 10 |
A | At around 2105 m of depth |
B | At around 2110 m of depth |
C | At around 2158 m of depth |
D | At around 2102 m of depth |
E | At around 2177 m of depth |
Question 11 |
A | Channel-point bar |
B | Trangessive marine shelf |
C | Super-fan depositional lobes |
D | Prograding delta |
E | Slope channel |
F | Braided channel |
Question 12 |
A | Oil (petroleum) |
B | Brine water |
C | Fresh water |
D | Natural gas |
E | Low density bitumen |
Question 13 |
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 14 |
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 , 457 m , 470 m and 475 m |
B | At around 414 m , 451 m , 457 m , 464 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 , 464 m , 470 m and 475 m |
E | At around 412 m , 414 m , 422 m , 470 m and 475 m |
Question 15 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Between ~1066 m and ~1078 m |
B | Between ~1070 m and ~1078 m |
C | Between ~1066 m and ~1071 m |
D | Between ~1042 m and ~1043 m |
E | Between ~1025 m and ~1028 m |
Question 16 |
A | Just above position I |
B | At position III |
C | Just below position II |
D | Just above position II |
E | At position I |
Question 17 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | Clean sand |
B | Carbonaceous sandstone |
C | Dolomite with clay interbeds |
D | Dolomite |
E | Limestone with sand interbeds |
Question 18 |
A | Coal |
B | Shale |
C | Interbedded clean sandstone and shale |
D | Sandstone |
E | Clean limestone |
Question 19 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Inaccuracies in measurements due to mud infiltration |
B | Poor tool pads in the well |
C | Borehole collapse |
D | Tight oil |
E | Signal interference or poor tool calibration |
Question 20 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | Between 1049 m and 1055 m |
B | Between 1047 m and 1060 m |
C | Between 1066 m and 1078 m |
D | Between 1066 m and 1071 m |
E | Between 1071 m and 1078 m |
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 1 and 2 |
B | Fracture 4 and 5 |
C | Fracture 7 |
D | Fracture 4 |
E | Fracture 8 and 9 |
Question 22 |
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 2995 m |
D | At 3095 m |
E | At 2955 m |
Question 23 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Slope channel deposit |
B | Channel point bar deposit |
C | Transgressive marine shelf |
D | Prograding marine shelf |
E | Interbeds of coal and sand |
Question 24 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Gas-bearing dolomite |
B | Shaly sandstone |
C | Feldspatic (K-spar rich) arenite |
D | Gas-bearing sandstone |
E | Gas-bearing calcite |
F | Shale interbeded sandstone |
Question 25 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Dolomite |
B | Anhydrite |
C | Argillaceous limestone |
D | Calcite |
E | Limestone |
F | Shale |
Question 26 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-whatisalog.htm
A | High concentration of gas ("gas effect") |
B | Sandstone formation |
C | Presence of hydrocarbons |
D | High porosity formation |
E | Coal bearing formation |
Question 27 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Anhydrite |
B | Limestone |
C | Glauconitic Sandstone |
D | Dolomite |
E | Sandstone |
Question 28 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Limestone |
B | Sandstone |
C | Shale |
D | Dolomite |
E | Anhydrite |
Question 29 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
A | Shale |
B | Seal |
C | Caprock |
D | Sandtone |
E | Mudstone |
Question 30 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/22-fracloc5.htm
A | 150 degrees Northwest |
B | 40 degrees Southeast |
C | 50 degrees Southeast |
D | 60 degrees Southeast |
E | 30 degrees Northwest |
Question 31 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | Between 2970 m and 3075 m |
B | At 3075 m |
C | Between 3075 m and 3085 m |
D | Between 2945 m and 2970 m |
E | Between 2890 m and 2895 m |
Question 32 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/13-lithvisual.htm
A | ~0.013 |
B | ~1.0 |
C | ~0.38 |
D | 0.0 |
E | ~75 |
Net sand interval = 3075 m - 3000 m = 75 m (read off the GR curve)
Hence, net:gross = 75 m/75 m = 1.0
Question 33 |
Image credit: Crain's Petrophysical Handbook, online at https://www.spec2000.net
Original at: https://www.spec2000.net/01-crainsrules.htm
A | At 1079 m |
B | At 1046.5 m |
C | At 1027 m |
D | At 1067 m |
E | At 1023 m |
Question 34 |
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 | Coal seam regions |
C | Water saturated zone |
D | Gas saturated zone |
E | Oil saturated zone |
Question 35 |
A | Organic rich black shale |
B | Interbeds of clean sand with shale |
C | Heavy metals |
D | Gas bearing sandstone |
E | Glauconitic sandstone |
Question 36 |
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 1212.5 m to 1223.5 m |
D | Between 1211.5 m to 1239.5 m |
Question 37 |
A | At around 2110 m of depth |
B | At around 2180 m of depth |
C | At around 2158 m of depth |
D | At around 2102 m of depth |
E | At around 2145m of depth |
Question 38 |
Image credit: United States Geological Survey, online at USGS database
A | Borehole collapse |
B | Intentionally changed the drill bit |
C | High pressure due to increased in depth |
D | Drilling mud infiltration |
E | Soft lithological facies |
Question 39 |
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 465 m of depth |
C | Around 451 m of depth |
D | Around 460 m of depth |
E | Around 422 m of depth |
Question 40 |
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 | Shale |
C | Quartz arenite |
D | Limy dolomite |
E | Shaly sandstone |
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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.