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Answered Same Day Dec 22, 2021

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Robert answered on Dec 22 2021

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Part I: True or False
2) True, the resistivity changes when rock is cut into two pieces.
3) False, Oil Saturation is defined as the fraction of the pore space occupied by the oil.
Part II: Multiple Choice Questions
1)F = 0.81 2
4) Determine permeability for permeable formation
9) Tortuosity Factor
Part III: Short Questions
1)
Log Principle
Drilling fluid in
which log can be
applied
List the
applications for
each log
Caliper Logs
The Caliper Log is a
tool for measuring the
diameter and shape of
a borehole. It uses a
tool which has 2, 4, or
more extendable arms.
Useful to estimate
the amount of
drilling mud in the
orehole, and to
estimate the amount
of cement required
to case the hole
*Indicator of good
permeability and
porosity zones
(reservoir rock) due
to development of
mudcake in
association with
gamma ray log.
*Calculation of
mudcake thickness,
hmc = (dbit – dh)/2,
where hstands for
the hole, in inches.
*Measurement of
orehole volume, Vh
= (dh
2/2)+1.2%, in litres
per metre.
SP Log
Salinityofa fluid is
inverselyproportionalto
itsresistivity, so in
practicemud filtrate
salinityis indicatedby
mud filtrate
esistivity(Rmf) and
formationwater
salinityby
formationwater
esistivity(Rw)
Conductive fluid *Detect permeable
eds
*Detect boundaries
of permeable beds
*Determine
formation-water
esistivity (Rw)
*Determine the
volume of shale in
permeable beds
Gamma Ray Log
Gamma Ray(GR) tool
measures the natural
adioactivity in
formations
Used to identify
lithologies, co
elation
and Vsh calculation
Clean sst with K-
feldspar, mica,
glauconite, or U-rich
waters may also
produces high GR
eadings
Processing that
information gives
curves for the
presence of Th, K
and U in the
formation
High K, High GR
esponse may
indicate glauconitic
or micaceoussst
Induction Log
Principle of the
measurement is that
the voltage induced in
the receiver coil is
proportional to the
ground loop cu
ent,
and therefore,
proportional to the
formation
conductivity.
Oil based mud,
water-in-emulsion
mud, air or gas
*Measures deep
esistivity of the
formation or close to
the true resistivity
(Rt)
*Measures the
medium resistivity of
the formation or
esistivity of the
invaded zone(Ri)
*Shallow focused
laterolog measures
the shallow
esistivity of
the formation or the
esistivity of the
flushed zone (Rxo)
Lateral Log
Works best in fresh
mud, low porosity
2) The four methods to determine water resistivity:
a) From SP log:...

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