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: <iagi-net@iagi.or.id> 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 > -------------------------------------------------------------------------------- > ---------------------------------------------------------------------------- > Hot News!!! > CALL FOR PAPERS: send your abstract by 30 March 2007 to > [EMAIL PROTECTED] > Joint Convention Bali 2007 - The 32nd HAGI, the 36th IAGI, and the > 29th IATMI Annual Convention and Exhibition, > Bali Convention Center, 13-16 November 2007 > ---------------------------------------------------------------------------- > To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id > To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id > Visit IAGI Website: http://iagi.or.id > Pembayaran iuran anggota ditujukan ke: > Bank Mandiri Cab. Wisma Alia Jakarta > No. Rek: 123 0085005314 > Atas nama: Ikatan Ahli Geologi Indonesia (IAGI) > Bank BCA KCP. Manara Mulia > No. Rekening: 255-1088580 > A/n: Shinta Damayanti > IAGI-net Archive 1: http://www.mail-archive.com/iagi-net%40iagi.or.id/ > IAGI-net Archive 2: http://groups.yahoo.com/group/iagi > --------------------------------------------------------------------- ---------------------------------------------------------------------------- Hot News!!! CALL FOR PAPERS: send your abstract by 30 March 2007 to [EMAIL PROTECTED] Joint Convention Bali 2007 - The 32nd HAGI, the 36th IAGI, and the 29th IATMI Annual Convention and Exhibition, Bali Convention Center, 13-16 November 2007 ---------------------------------------------------------------------------- To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id Visit IAGI Website: http://iagi.or.id Pembayaran iuran anggota ditujukan ke: Bank Mandiri Cab. Wisma Alia Jakarta No. Rek: 123 0085005314 Atas nama: Ikatan Ahli Geologi Indonesia (IAGI) Bank BCA KCP. Manara Mulia No. Rekening: 255-1088580 A/n: Shinta Damayanti IAGI-net Archive 1: http://www.mail-archive.com/iagi-net%40iagi.or.id/ IAGI-net Archive 2: http://groups.yahoo.com/group/iagi ---------------------------------------------------------------------
-- Noel ---------------------------------------------------------------------------- Hot News!!! CALL FOR PAPERS: send your abstract by 30 March 2007 to [EMAIL PROTECTED] Joint Convention Bali 2007 - The 32nd HAGI, the 36th IAGI, and the 29th IATMI Annual Convention and Exhibition, Bali Convention Center, 13-16 November 2007 ---------------------------------------------------------------------------- To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id Visit IAGI Website: http://iagi.or.id Pembayaran iuran anggota ditujukan ke: Bank Mandiri Cab. Wisma Alia Jakarta No. Rek: 123 0085005314 Atas nama: Ikatan Ahli Geologi Indonesia (IAGI) Bank BCA KCP. Manara Mulia No. Rekening: 255-1088580 A/n: Shinta Damayanti IAGI-net Archive 1: http://www.mail-archive.com/iagi-net%40iagi.or.id/ IAGI-net Archive 2: http://groups.yahoo.com/group/iagi ---------------------------------------------------------------------
