neutron log tools and characteristics
TRANSCRIPT
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Asriza
Dimas
Almer
NEUTRON LOG
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OUTLINE Definition.
Types
Units & Presentation Theories of measurement
Tool and Characteristics
Quantity and Quality Using on Neutron Porosity
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NEUTRON LOG Neutron log is a porosity log that measured the concentration of
hydrogen ion in rocks formation
Used for determined the total porosity of rocks, regardless of
whether the pores filled by hydrocarbons and water in a formation
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NEUTRON LOG
Neutron logs all emit neutrons
from a source at the bottom of
the tool. (Americium atau
Berillium), that emitted to rocks
formation
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THE PRINCIPLES O NEUTRON LOGGING
Neutron source emits a continuous flu of high!energy
neutrons"
#ollisions with formation nuclei reduce the neutron energy
!thereby slowing it down, mostly in hydrogen" Neutrons are slowed sufficiently to be captured by
nuclei, at thermal energy le$els (approimately %"%&' e)
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*+ -.N#./+0 12 N+U-1N /133.N3
Neutron capture results in an emission of gamma rays"
Capturing nuclei become excited and emit gamma
rays The detector will captured the gamma radiation, and
if the amount of gamma rays per second quite bit
high so the porosity will very low
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EL!STIC !N" INEL!STIC SC!TTERING
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NEUTRON LOG TOOLS !N"
CH!R!CTERISTICS
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GAMMA A! N"UT#N $#G %GNT
.s the first generation of neutron log" .t use the
basic measurement using the principle of neutron
logging" .gnore bore hole diameter, only source
and detector with no configuration
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'(D")A$$ N"UT#N P##'(T! %'NP
borehole effects minimized
automatic corrections
applicable to empty holes
4 -ugosity and mudcake effects
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C#MP"N'AT"D N"UT#N $#G %CN$
Neutron 0ource emitting , and causing
scattering of gamma ray" wo detector
detect with distance to gi$e a proper
measurement with less error
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C#MP"N'AT"D N"UT#N $#G %CN$
thermal neutron detection instrument
wo detectors minimize borehole effects
ertical resolution ! & ft
-adial in$estigation f(porosity) No porosity ! 5ft"6*igh porosity less
#ased or openhole
0tatistical in nature, logging speed &%!7% fpm
#an be run with other logs
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DUA$ N"UT#N $#G %DN$
he 0ame with #N/, gi$es proper
measurement " -adial scattering cause
more effect on gamma radiation from all
sides
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SNP #S CNL
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$U!NTIT% !N" $U!LIT% USING ON
NEUTRON POROSIT%
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QUANT(T! U'(NG
orosity formula 8
with 0igma 9 true porosity 6 a : B 9 constant 6 N 9 Neuron read
o determine the porosity $alue of formation
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&e can 'etermine
(orosit) of formation
*ith gra(h +
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G!S EECT TO NEUTRON LOG
3as content $ery low
hydrogen, so the
neutron log turn to right
etreamly
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NEUTRON LOGGING APPLICATIONS
Neutron tools are used primarily to determine8
orosity, usually in combination with the density tool
3as detection, usually in combination with the density tool, but alsowith a sonic tool
0hale $olume determination, in combination with the density tool /ithology indication, again in combination with the density log and;or
sonic log 2ormation fluid type"
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$U!LIT% USING
o determine the litology, we ha$e
to knowing distribution of
hydrogen in a formation *ydrogen that detect on neutron
log are hydrogen on hydrocarbon
and hydrogen on water
/ecture notes for + 7
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CONCLUSION
Neutron log measure porosity of the formation
Neutron log is an active sensor, its emit neutron and detect
gamma rays
Neutron log can be used both open and closed hole for some
equipment like CNL To determine formation, usually neutron log combine with other
log
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REERENCE
+ngler, "=", &%5&, /ecture notes for + 7ournal, p"5&!7