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Return-Path: <[EMAIL PROTECTED]> Received: (qmail 8508 invoked from network); 23 Mar 2004 04:56:05 -0000 Received: by incoming mail bandwidth measurement device Received: from relay01.par.totalfinaelf.net (HELO SEA-PAR-SUN-SMTP-02A.totalfinaelf.net) (213.31.226.166) by server9.client.org with SMTP; 23 Mar 2004 04:56:05 -0000 Received: from SEA-PAR-SUN-SMTP-02A.totalfinaelf.net (localhost [127.0.0.1]) by localhost.par.totalfinaelf.net (Postfix) with ESMTP id A663411BC24 for <[EMAIL PROTECTED]>; Tue, 23 Mar 2004 04:57:51 +0000 (GMT) Received: from trdfed1.total.com (unknown [10.250.1.3]) by SEA-PAR-SUN-SMTP-02A.totalfinaelf.net (Postfix) with ESMTP id 6D4FC11B495 for <[EMAIL PROTECTED]>; Tue, 23 Mar 2004 04:57:51 +0000 (GMT) Received: from [10.24.20.25] by trdfed1.total.com with ESMTP for [EMAIL PROTECTED]; Tue, 23 Mar 2004 06:05:05 +0100 Received: from int-domino-h11.hq.ad.ep.corp.local ([10.62.240.146]) by p-gr-ms-cou02 (Lotus Domino Release 5.0.5) with ESMTP id 2004032305583577:266501 ; Tue, 23 Mar 2004 05:58:35 +0100 Subject: Inversi To: [EMAIL PROTECTED] X-Mailer: Lotus Notes Release 5.0.5 September 22, 2000 Message-Id: <[EMAIL PROTECTED]> From: NOOR Yuriza <[EMAIL PROTECTED]> Date: Tue, 23 Mar 2004 12:54:59 +0800 MIME-Version: 1.0 X-MIMETrack: Serialize by Router on EFRDEF-H11/INT/SRV/EP/Corp(Release 5.0.5 |September 22, 2000) at 03/23/2004 06:08:22 AM, Itemize by SMTP Server on XFRPAR-HE02/GROUP/Corp(Release 5.0.5 |September 22, 2000) at 03/23/2004 05:58:35 AM, Serialize by Router on XFRPAR-HE02/GROUP/Corp(Release 5.0.5 |September 22, 2000) at 03/23/2004 05:58:36 AM, Serialize complete at 03/23/2004 05:58:36 AM Content-type: text/plain; charset=us-ascii Maaf ikutan nimbrung sedikit ..... Setuju dengan pendapat pak Hasan dan pak Leo, salah satu keuntungan inversi adalah menghilangkan efek wavelet yang nanti ujungnya adalah peningkatan resolusi dan pengurangan efek tuning. Masalahnya,- seperti yang sudah ditulis dibawah oleh pak Hasan-, keuntungan diatas hanya bisa didapat dengan mengunakan wavelet yang benar, kalau tidak malah inversinya akan menyesatkan. Biasanya wavelet dihasilkan dari ekstraksi seismic yang akan diinversikan itu. Untuk mengekstraksi dengan benar diperlukan kalibrasi seismic vs synthetics seismogram yang baik. Untuk menghasilkan kalibrasi yang baik synthetics seismogramnya harus memakai wavelet yang benar ....... Lha kok malah mbulet ?????. Ya begitulah prosesnya mbulet ..... artinya software ( Synthetics GF4, Syntool Landmark, Humpson Russell, Interwell-Cal3D dll) akan mengekstraksi wavelet statistical, mengkalibrasi berulangkali sambil menggeser phasa si wavelet itu, sampai Seismic vs Synthetics Seismogram menghasilkan harga korelasi paling besar dengan lag/shift kecil (kalibrasinya bagus). Si wavelet yang menghasilkan kalibrasi paling bagus ini dinamakan bestfit wavelet. Apakah kemudian cerita wavelet dan seismic ini sudah happy ending, dan dengan bahagia mereka akan berinversi selamanya ?. Belum .... persoalan lain bisa muncul : ..... waveletnya nggak stabil .... arti kata bestfit wavelet yang diekstrak dari sumur yang satu beda dengan sumur yang lain, celakanya bukan buntutnya saja yang beda dikit sehingga bisa diaveraging, ini geser pula phasanya 60 derajat, aduh gimana ini ...... katanya seismic processingnya phase consistence .... Kalau sudah kejadian seperti ini (ini bukan kasus ekstrim) terpaksalah balik jauh kebelakang...... validasi lagi sonicnya, lihat lagi pickingan first arrival checkshotnya, untuk memastikan TvsD curve yang dihasilkan tidak ada efek strecth and squeeze, serta RC yang dihasilkan sudah benar. kalau tahap ini sudah OK mungkin bisa pikir pikir melakukan well driven rephasing seismic. buat menyeragamkan wavelet. Kalau kalibrasi sudah OK, wavelet lebih kurang seragam, study xplot medukung (contohnya AI vs PHIE, PHIE vs GR, dll) tentu ada untungnya melakukan inversi. Tapi sebaliknya bila ditahap awal itu hasilnya tidak konklusif, kenapa mesti buang buang uang ....... Zainal ABIDIN Pour : Yuriza NOOR/BPN/ID/EP/[EMAIL PROTECTED]&P 23/03/2004 cc : 11:23 AM Objet : RE: [fogri] seismic refleksi untuk coal ----- Forwarded by Zainal ABIDIN/BPN/ID/EP/Corp on 23/03/2004 11:21 AM ----- "Hasan Sidi" <[EMAIL PROTECTED] To: <[EMAIL PROTECTED]> ason.com> cc: Subject: RE: [fogri] seismic refleksi untuk coal 23/03/2004 10:27 AM Please respond to fogri Oops ... kayaknya kita kudu balik ke filosofi awal. Inversi bertujuan mengembalikan seismic ke layer property dengan me-remove wavelet effects (sidelobes etc). Wavelet yang baik tentunya harus 1) menghasilkan synthetic seismogram yang baik pada well location, DAN 2) memiliki spectrum yang sesuai/match dengan seismic data-nya. Kalau kita lihat #2, mungkin bisa dibayangkan 2 extreme cases dimana 1) wavelet yang kita pergunakan memiliki bandwidth yang jauh lebih sempit (lower frequency) dari input seismic atau 2) jika sebaliknya, wavelet kita memiliki bandwidth yang lebih lebar. Jadi bisa-2 saja hasil inversi lebih low resolution karena wavelet yang dipergunakan tidak tepat. Tergantung the man behind the gun ... :-) Ini baru bicara spectrum. Issue yang mungkin relevant juga adalah wavelet scaling yang berdampak pada dynamic range dari hasil inversi, namun sekilas bisa menimbulkan pertanyaan tentang resolusi ari hasil inversi. So, be careful! F. Hasan Sidi Fugro-Jason Australia BV Phone: +61 8 9420.6056 Fax: +61 8 9420.6060 > -----Original Message----- > From: Irfan, Mufti [mailto:[EMAIL PROTECTED] > Sent: Tuesday, March 23, 2004 9:50 AM > To: '[EMAIL PROTECTED]' > Subject: RE: [fogri] seismic refleksi untuk coal > > > Mungkin "ada" benarnya pak Leo. Karena inversi bermakna > pembalikan, mk cara > berpikir orang menjadi ter-balik2. > Jadi kalau hasil inversi bisa dipakai utk refining interpretation, mk > tentunya inversi berarti memperbaiki resolusi seismik vertically and > laterally. > Di dalam proses inversi terlibat low and high component > frequency. Dan ini > yg menjadikan inversi memperbaiki resolusi. > Kalau yg menurunkan resolusi vertikal itu, jangan2 yg > dimaksud adalah ... > PSDM ? Wah barangkali saya salah lagi. Mohon dikoreksi !!. > > muf > > > > -----Original Message----- > From: Leonard Lisapaly [mailto:[EMAIL PROTECTED] > Sent: Tuesday, March 23, 2004 8:33 AM > To: [EMAIL PROTECTED] > Subject: RE: [fogri] seismic refleksi untuk coal > > > > Inversi menurunkan vertical resolution. > Oh ya ? > > LL > > -----Original Message----- > From: Allo, Paulus T [mailto:[EMAIL PROTECTED] > Sent: Tuesday, March 23, 2004 8:08 AM > To: [EMAIL PROTECTED] > Subject: RE: [fogri] seismic refleksi untuk coal > > > salah satu cara utk meningkatkan resolusi dgn inversi? > kok bisa? berapa besar peningkatannya? > inversi bukannya malah menurunkan vertical resolution? > > -- > paulus > ConocoPhillips Indonesia > > > Once upon a time Leonard Lisapaly wrote : > > > Untuk meningkatkan resolusi ada dua cara : > > > > 1. dekonvolusi > > 2. inversi > > -------------------------------------------------------------- > ------- To > unsubscribe, e-mail: [EMAIL PROTECTED] Visit FOGRI Website: > http://fogri.or.id FOGRI Archive: > http://www.mail-archive.com/fogri%40iagi.or.id/ > ---------------------------- > ----------------------------------------- > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > Visit FOGRI Website: http://fogri.or.id > FOGRI Archive: http://www.mail-archive.com/fogri%40iagi.or.id/ > --------------------------------------------------------------------- > > -------------------------------------------------------------- > ------- To unsubscribe, e-mail: [EMAIL PROTECTED] > Visit FOGRI Website: http://fogri.or.id FOGRI Archive: http://www.mail-archive.com/fogri%40iagi.or.id/ ---------------------------- ----------------------------------------- --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] Visit FOGRI Website: http://fogri.or.id FOGRI Archive: http://www.mail-archive.com/fogri%40iagi.or.id/ --------------------------------------------------------------------- --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] Visit FOGRI Website: http://fogri.or.id FOGRI Archive: http://www.mail-archive.com/fogri%40iagi.or.id/ ---------------------------------------------------------------------
