penentuan porositas
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8/19/2019 Penentuan porositas
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Penentuan porositas
•Sonic log
•Density Log•Neutron Log
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Sonic Log
Keterangan :
Øs=porositas sonic
∆tma=interval transite time matriks∆tlog=interval transite time formasi
∆tf=interval transite time fluida dalam sumur (fresh
mud=189, salt mud =185)
tmatf
tmat s
∆−∆
∆−∆=
logφ
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Kecepatan sonic dan ∆t untuk beberapa enis matriks
Assumsi : porositas antar butiran seragam, formasimengandung air, formasi terkompaksi (padat, formasibersi! (tidak mengandungs!ale
Jenis Material Vma (ft/sec) tma ( sec/ft) tma ( sec/ft)
Sandstone 18000-19500 55.5-51.0 55.5-51.0
Limestone 21000-23000 !."-3.5 !."
#olomites 23000-2"000 3.5-38.5 3.5
$n%&drites 20000 50.0 50.0
Salt 15000 "".! "!.0
'asin (iron) 1!500 5!.0 5!.0
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Density Log
te)(mudfiltragr!cc1"1,1
gr!ccrata,ratafluidadensit#$f
gr!cclog,densit# batuandensitas$b
gr!cc batuan,matriksdensitas$ma
$f $ma
$b$ma
−=
−=
=
=
−
−=φ
Jenis at*an #ensitas(r/cc)
$n%&drit 2.95
#olomite 2.85
'alcite 2.!1
Limestone 2.!0
+*art, 2.""
aolinite 2."3
llite 2.!"Monmorillonite 2
alite 2.1!
'oal 1 1.8
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Neutron Log
shalelapisan padaneutronkurva padaterbaca#ang porositas%&sh
)(dari'ogshalevolume*sh
+keterangan
%&sh)(*sh%&%&-
shale(%halterhadapterkoreksi#angneutron.orositas
formationlimestoneterhadapkoreksi/"/05
neutronlogkurva padaterbaca#ang.orositas%&log
+keterangan
/"/05%&og)(1"/%&imestone
=
=
−=
=
=
+=