Well Logging Mid - I, September - 2014

1.The main uses of GR-log are
  • To determine hydrogen content in the formation
  • To determine porosity in the formation
  • To identify sand-shale zones in the formation
  • To identify interval travel time
Answer: C
2.Borehole enlargement are most commonly observed in
  • Shale & shaly formations
  • Sandy formations
  • Silty formations
  • Hard and compact rocks
Answer: A
3.Section drilled in gauge means
  • Borehole diameter is larger than bit-size
  • Borehole diameter is less than bit-size
  • Borehole diameter is equal to the bit-size
  • All the above
Answer: C
4.In the well log sheet SP-Curves are plotted in the
  • 1st track-linear scale
  • 2nd track-logarithmic scale
  • 3rd track-linear scale
  • 1st track-logarithmic scale
Answer: A
5.What is the full form of LWD in logging
  • Lowering while drilling
  • Logging while drilling
  • Log with diameter
  • None of the above
Answer: B
6.Common value of matrix-density (g/cm3) of sand or sandstone is
  • 2.98
  • 2.87
  • 2.65
  • 2.71
Answer: C
7.The SP observed in boreholes is of __________________origin.
  • Electrokinetic & electrochemical
  • Electromagnetic
  • Thermal
  • Electromagnetic and electrokinetic
Answer: A
8.Football effect (crossover between neutron-porosity curves) normally indicates
  • Salt water bearing zone
  • Fresh water bearing zone
  • Gas bearing zone
  • None of the above
Answer: C
9.Formation resistivity factor (F) depends on
  • The tortuosity of the rock
  • The porosity of the rock
  • Both (a) & (b)
  • Other factors, not the factors (a) & (b)
Answer: C
10.Rt (True Resistivity) of the formation is the resistivity of
  • Mud cake
  • Flushed zone
  • Transition zone
  • Un-invaded zone
Answer: D
11.Resistivity of the mud-filtrate can be expressed by symbol____________________.
Answer: Rmf
12.Caliper tool mainly measures the____________________.
Answer: diameter of borehole
13.Generally subsurface temperature varies ____________________with depth.
Answer: linearly
14.The most abundant source of natural radioactivity is the radioactive isotope of____________________.
Answer: potassium‐K40
15.____________________ may formed in the borehole wall when mud filtrate invades in the permeable zone.
Answer: mud cake
16.The full form of MSFL is____________________.
Answer: micro‐spherical focused log
17.Formation water resistivity (Rw) can be derive frequently with the help of____________________ Log.
Answer: Essp
18.Bulk density of the formation can be measured with ____________________ tool.
Answer: litho‐density
19.Presence of secondary porosity usually complicates the quantitative evaluation of____________________log.
Answer: sonic
20.The neutron log helps to understand the __________________content of the formation.
Answer: hydrogen