1/RT = (Sw^n*phi^m)/RW
atau
RT = RW/(Sw^n * phi ^m )
shale resistivity rendah bisa karena
1. banyak air yang tertrap di shale karena tidak sempat keluar pada saat
rapid sedimentation dan overburden serta kecilnya permeabilitas di shale
(SW besar RT kecil)
2. Shale diendapkan di daerah dengan salinity tinggi (offshore / jauh dari
source ) Salinity tinggi , Rw rendah, RT kecil
Jadi belum tentu juga bahwa resisitivity shale yang rendah bisa jadi
indikasi overpressure
Regards
Kartiko-Samodro
Telp : 3852
|---------+---------------------------->
| | "Bambang Murti" |
| | <[EMAIL PROTECTED]> |
| | |
| | 09/08/2005 09:18 |
| | AM |
| | Please respond to|
| | iagi-net |
| | |
|---------+---------------------------->
>------------------------------------------------------------------------------------------------------------------|
|
|
| To: <iagi-net@iagi.or.id>
|
| cc:
|
| Subject: RE: [iagi-net-l] Shale Pore Pressure Prediction - Sand?
|
>------------------------------------------------------------------------------------------------------------------|
Mungkin juga, may be I'm wrong.
Tapi, coba aja dilihat ditempat-tempat yang overpressure, yang jelas,
shale resistivity-nya semakin rendah.
Nah, kira-kira apaan yang menyebabkan resistivity-nya turun?
Yang jelas, tekanan dizona tersebut besar (shale), nah ini yang perlu
dicari kaitannya dengan penurunan resistivitynya.
Memang benar sih, kalau dalam keadaan kering, matrix batuan akan
bersifat resistif, dan batuan yang fully compacted memang akan menjadi
dry matrix.
Kalau di overpressured shale, dianya akan menjadi undercompacted.
Kalau salinity interlayered shale tetap, maka trend resistivity-nya akan
konstan.
Padahal kan yang teramati resistivity-nya justru menurun.
Padahal, resistivity berbanding terbalik dengan salinitas, dan juga ,
temperatur.
Jadi ???
(Waduh, ini jadi ketularan Ferdi, mulai pakai ???)
BSM
-----Original Message-----
From: Shofiyuddin [mailto:[EMAIL PROTECTED]
Sent: Monday, August 08, 2005 10:32 PM
To: iagi-net@iagi.or.id
Subject: Re: [iagi-net-l] Shale Pore Pressure Prediction - Sand?
Mas Bang, ente kebalik kayaknya. Derajat kompaksi meningkat maka
resistivitasnya meningkat alias konduktifinya menurun.
Jadi kalo kompaksi normal, seharusnya semakin dalam resistivity shale
akan
semakin membesar, otherwise then it tend to be under-compacted
(pressurized).
On 8/8/05, Bambang Murti <[EMAIL PROTECTED]> wrote:
>
> Satu hal lagi, resistivity trend di shale juga bisa dijadikan guide
> untuk memprediksi keberadaan suatu abnormally pressurized zone.
> Overpressure dan Underpressure (ini ada ndak?) mestinya tidak terjadi
> secara mendadak, jadi mestinya ada trend yang bisa dicermati.
> Premisnya, jika derajat kompaksi meningkat, maka conductivity juga
akan
> meningkat dan otomatis resiprokal resistivitynya akan menurun.
> Pertanyaannya adalah (ini mirip iklan), "how low can we go" dengan
trend
> resistivity ini. Mungkin juga dapat di-identik-kan/dikorelasikan
dengan
> mud-weight vs stacking velocity ?
> Ada yang pernah mencoba untuk melakukan plotting trend resistivity ini
?
> Trend yang "normal" sesuai dengan kenaikan derajat kompaksi karena
over
> burden dan juga trend yang "abnormal" karena mendekati overpressured
> zone?
> Bambang
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> Sent: Friday, August 05, 2005 10:24 AM
> To: iagi-net@iagi.or.id
> Subject: RE: [iagi-net-l] Shale Pore Pressure Prediction - Sand?
>
>
> kebalik Mas Iwan,
> velocity turun, pp naik.
>
> apakah benar2 overpressure atau bukan,
> utk velocity look ahead, tidak bisa di check.
> kecuali dg di drill. kecuali well known area.
> tapi kalau udah well known ngapain juga di look ahead.
>
> cara yang paling 'murah' dan gampang , di flow check saja.
> kalau gain ya ditambah mw, kalau nggak yaa continue drilling.
> secara sistematis tiap 30m-50m flow check.
>
>
> Regards,
>
> =============================
> AMIR AL AMIN - DKS/OPG/WGO
> TOTAL E&P INDONESIE
> BALIKPAPAN
> (62-542)-534283 - (62)-811592277
> ============================.
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Salam hangat
Shofi
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