Pak Noel .....
Kalo paper saya gak punya. Ini adalah hasil diskusi saat kerja (sekalian
mohon dikoreksi kalo ada yang kurang). Mudahnya kalau kita ingin yakin gas
apa yang terkandung dalam batuan (batubara) adalah dengan melihat gas
chromatogram (C1 - C5) yang dikonfirmasi dengan data cutting (jenis litologi
dari gas yang keluar). Jadi, kurva resistivity kita cocokkan dengan gas
chromatogram. Tapi lihat juga calipernya (lubang gerowong bisa bikin
resistivity tinggi).
Kalau ada gas lain dari penafsiran resistivity, saya pikir itu bisa kita
lihat lagi dari tatanan geologinya, seperti kalau ada devolatisasi akibat
intrusi maka apakah dari sumur yang kita mainkan memang wilayah permainan
kita dekat dengan intrusi? Tentu saja akan lebih valid jika kita dapat data
dari in-situ measurement mengenai jenis dan kuantitas gas-nya (seperti yg
Pak Noel pernah tulis).
Mudah-mudahan jawabannya bisa ngebantu...
Yudi S. Purnama
GDA Consultant
Address: Jl. Tebet Timur Dalam X No. 2
Phone: 021 8379 2688,
Fax: 021 8379 2687
Cell: 0815 7019 351
E-mail: [EMAIL PROTECTED], [EMAIL PROTECTED]
Jakarta - Indonesia
----- Original Message -----
From: "Noel Pranoto" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, May 04, 2007 7:35 PM
Subject: Re: [iagi-net-l] tambahan ttg CBM
Pak Yudi, saya tertarik dgn metoda/cara mengetahui/mengukur adanya gas
pada lapisan batubara dari kurva resistivity. Kalau boleh bisa dirujuk
judul buku/paper atau tautanya di internet? Terus terang sdh hampir 2
thn saya mencarinya namun belum pernah ketemu.
Kalau dari yg saya pernah alami, perbedaan nilai resistivity pada gbr
tsb. bisa diartikan macam-macam, mis. adanya devolatisasi (hilangnya
zat terbang) akibat intrusi, oksidasi, dll.
Dibawah saya kopikan keterangan dari salah satu jasa konsultan CBM di
website-nya yg pernah juga coba dihubungi.
========quote============
Gas adsorbed to coal cannot be measured directly, but in-situ gas
content can be derived by correlating the coal properties, measured
with logs, to the coal composition and gas content of representative
core analyses. Coal cleat porosity is the primary mechanism
controlling gas producibility and is also difficult to measure
directly. Proven **** logging techniques for delivering these key CBM
properties in situ include
* traditional logs, such as the high-resolution density log,
linked with innovative analysis algorithms to develop local models
derived from existing core and production data
* advanced logs, such as geochemical logs, with processing and
analysis tailored to the specific needs of CBM, providing answers that
are more accurate and comprehensive.
=====end of quote=========
Trims,
Noel
On 5/4/07, Yudi S Purnama <[EMAIL PROTECTED]> wrote:
Sekedar nambahkan lagi....
Kalau mau deteksi batubara dari log kita bisa lihat density yang rendah
(BJ
batubara kisarannya 1.3 - 1.7 atau termasuk batuan yang ringan),
sementara
kalau ingin tahu apakah adanya gas atau tidak kita lihat saja
resistivitynya
(seperti gambar yang diberikan oleh rekan Bayu). Kalau Gamma Ray bisa
rendah
atau tinggi, karena ternyata coaly shale sekalipun bisa menghasilkan
metan.
Kahatur Nuhun
Yudi S. Purnama
GDA Consultant
Address: Jl. Tebet Timur Dalam X No. 2
Phone: 021 8379 2688,
Fax: 021 8379 2687
E-mail: [EMAIL PROTECTED], [EMAIL PROTECTED]
Cell: 0815 7019 351
Jakarta - Indonesia
----- Original Message -----
From: "Paulus Tangke Allo" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, May 04, 2007 4:10 PM
Subject: Fwd: [iagi-net-l] tambahan ttg CBM
> ---------- Forwarded message ----------
> From: Bayu Nugroho <[EMAIL PROTECTED]>
>
> sebenarnya gbr ini hanya memperlihatkan peluang untk terjadinya kick
> dengan asumsi pemakaian mud yg sama.
> karena kick itu terjadi akibat kurangnya tekanan mud terhadap formasi.
>
>
> On 5/4/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>> > Bayu
>>
>> Mungkin kalau ada gambar kedua macam log tersebut akan lebih jelas
>> Anda punya ?
>>
>> Si-Abah
>
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Noel
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