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|        |          23/03/2004 12:56 PM                                 |
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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
>
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