air jebakan
DESCRIPTION
sumber googleTRANSCRIPT
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[email protected]/2013
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Air jebakan
PorositasPermeabilitas
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Porositas
o Volume free space pada sedimen
padatair
air
VV
xVp
% 100
% 100
x
samplerockVol
spaceporetotalVolp
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Kisaran porositas : 0 – 100 %
Porosities in sediments : 5 – 25 %
Porosities 25-35 % : excellent if found in
an aquifer or
oil reservoir
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Primary Porosity Secondary Porosity
Terbentuk ketika proses sedimentasi
batuan terjadi
Terbentuk setelah
sedimentasi terjadi
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a. intergranulas, b. Sucrosic,
c. Moldic or Oolitic, d. Matrix or Chalky,
e. Moldic or Vuggy, f. Fracture porosity.
Intergranular porosity is primary, the
balance are secondary
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Porosities : lower in deeper and older
rocks
Due to overburden stresses on the rock
and cementation
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Permeabilitas
o Kemampuan air untuk melewati pori partikel
padat
o Interconnectedness ruang pori dalam
sedimen/batuan
http://withfriendship.com/user/mithunss/permeability.php
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Permeabilitas dipengaruhi beberapa
variabel :
a) Porositas
b) Geometri pori
c) Tortuositas
d) Ukuran pori
e) Pressure gradient
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Air Jebakan = Air pori = Interstitial water
• Ketika partikel pertama kali menempel di sedimen, akan ada sejumlah air laut yang masuk di antara butiran partikel tersebut
• Air laut tersebut akan terjebak di antara partikel seiring dengan proses kompaksi air jebakan
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Suatu larutan/air yang
mengisi ruang pori
antara batuan dan
sedimen
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Tolok ukur kondisi kimia sedimen
Media terjadinya :kelarutan
solidifikasiadsorbsi – desorbsi,
Absorbsioksidasi – reduksitranspor elemen
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(Shultz and Zabel, 2006)
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(Shultz and Zabel, 2006)
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(Andersen & Andersen, 1971)
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Sampling Porositas & Permeabilitas
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Sampling Air Jebakan
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http://minerals.usgs.gov/west/projects/pathdel.htm
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