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Petrophysics,

Connecting people

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Well Logging

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Well Logging

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Log Header, containing manyinformations of Logging program,

including :1. Logging interval2. Total depth3. Mud and filtrate resistivity

measurement4. Elevation etc

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Log Gamma Ray

(Pertamina EPTC. 2011)

(Malcolm rider. 2002)

(Malcolm rider. 2002)

Aplikasi log Gamma Ray (Rider. 2000) : Perhitungan Kandungan serpih Pendugaan fasies Identifikasi mineral

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Log Densitas

(Oberto Serra. 1984)(Malcolm rider. 2002)(Afdil Evan. 2009)

Aplikasi log Densitas (Rider. 2000) : perhitungan porositas Perhitungan AI Pendugaan litologi secara umum

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Log Neutron

(Pertamina EPTC. 2011) (Malcolm rider. 2002)(Singer. 2008)

Aplikasi log Neutron (Rider. 2000) : Perhitungan porositas Identifikasi gas

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Log Resistivitas

Aplikasi log Resistivitas (Rider. 2000) : Saturasi fluida Karakter perlapisan

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Log SP

Aplikasi log SP (Rider. 2000) : Perhitungan resistivitas air formasi Indikasi zona permeabel Perhitungan kandungan serpih

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Log Sonik

Aplikasi log Sonic (Rider. 2000) : Perhitungan porositas Perhitungan AI

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Log Caliper

Aplikasi log Caliper (Rider. 2000) : Pengukuran kondisi ukuran lubang

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Clay + silt + other

Clays

Plate-like form

Large surface area

Contain Al+3 and Si+4

Substitution by Mg+2

Negative chargeresults

Attraction by waterand cations

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Shale Distribution Types

Dispersed Clay

Clay Lamination

Structural Clay(Rock Fragments,

Rip-Up Clasts,Clay-Replaced Grains)

fe

fe

fe

ClayMinerals

Detrital QuartzGrains

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Structural replaces matrix

may not affect porosity-permeability

relatively uncommon

e.g., clasts in channels

Structural Clay

(Rock Fragments,

Rip-Up Clasts,

Clay-Replaced Grains)

fe

Clay

Minerals

Detrital Quartz

Grains

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Laminated

replaces matrix andporosity

reduces porosity-permeability

common e.g., intercalations

assume similar tonearby shale

Clay Lamination

fe Clay

Minerals

Detrital QuartzGrains

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Dispersed

replaces pore space

very common

forms in situ

may differ greatly from nearby shales

porosity-permeability reduction depends onform

Dispersed Clay

feClay

Minerals

Detrital Quartz

Grains

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Kaolinite booklets

moderate perm effects

may dislodge, blockthroats

Chlorite coating

significant perm loss

traps water

Illite tangle

chokes pores and throats

drastic perm reduction

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