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Estimasi pemodelan kecepatan Shear terbaik untuk karakterisasi Reservoar dengan Metode inversi simultan pada Lapangan XXX Cekungan Natuna Barat = Comparison of Estimates-Shear velocity (Vs) and its application to seismic simultaneous Inversion: "case study of West Natuna Basin X-Field" / Fatima Septi Sundari

Fatima Septi Sundari; Abdul Haris, supervisor ([Publisher not identified] , 2012)

 Abstrak

[ABSTRAK
Lapangan XXX merupakan lapangan minyak di cekungan Natuna Barat
dengan reservoir utama berupa reservoir batu pasir. Ketebalan reservoir pada
lapangan ini sangat bervariasi sehingga hasil inversi hanya dapat memetakan
ketebalan reservoir yang mendekati ketebalan tuning.
Berdasarkan uji sensitifitas, parameter AI di setiap sumur tidak dapat
membedakan hidrokarbon, sehingga parameter akustik saja tidak dapat diaplikasikan
dalam karakterisasi reservoir lapangan ini. Namun ketika parameter densitas terpisah
dengan parameter kecepatan P, sebaran hidrokarbon dapat dibedakan dengan baik.
Kecepatan S tidak tersedia di semua sumur padahal data ini sangat diperlukan
untuk melakukan pengolahan data dengan metode inversi simultan. Oleh karena itu
akan dilakukan beberapa estimasi untuk mendapatkan data kecepatan S antara lain
dengan metode castagna, metode gassmann, metode parsial, metode Xu-White dan
metode Lee. Data kecepatan S yang dipakai adalah kecepatan S terbaik yang
diperoleh dari metode Xu White dikarenakan hasil log poisson’s rationya paling
mendekati tren kurva saturasi air. Selain itu aspek rasio batuan yang
mempertimbangkan nilai porositas dan volume clay, serta kontrol kualitas Vp model
dari metode Xu-White memiliki rasio error minimum jika dibandingkan dengan nilai
Vp dari data log.
Metode inversi simultan dengan data pre-stack atau partial stack
memungkinkan dilakukannya prediksi parameter Impedansi P, Impedansi S, dan
densitas dari data seismik. Selain itu meode inversi simultan dapat dipergunakan
multi wavelet dalam pengolahan datanya. Hasil penampang inversi yang diperoleh
menunjukkan bahwa inverse densitas dapat menjelaskan letak sebaran batuan
reservoir dan fluida berdasarkan cut off sensitifitas yakni nilai dibawah 2,26 gr/cc.

ABSTRACT
field is an oil field in West Natuna Basin with sandstone reservoir as
primary target. There was varying reservoir thickness, so the inversion method that
could only be applied to map reservoir thickness, which close to tuning thickness.
Based on sensitivity analysis, Acoustic Impedance parameters couldn’t
indicate hydrocarbon appearance for each well, so Acoustic Impedance cannot be
applied for reservoir characterization in this field. Density versus Acoustic
Impedance could map hydrocarbon appearance.
Shear velocity weren’t available where those data was needed for running
simultaneous inversion method. Predicting velocity shear would be carried out by
using several method such as Castagna, Gassmann, Parsial, Xu-White, and Lee. The
best estimated velocity shear would be used for inversion, The best estimated shear
velocity from Xu-White method because Xu-White’s poisson ratio log presents
similar trend with water saturation log (Sw). Moreover, Xu-White’s ratio aspect is
also considering porosity and clay volume value. Based on quality control result, Vp
model of Xu-White had minimum error ratio compared to Vp from log.
Simultaneous inversion with pre-stack and parsial stack data what can be used
for predicting P-Impedance, S-Impedance, and density from seismic data. Otherwise,
this method is also used not only for single wavelet but also multi wavelet. The
inversion result from this study can mapping out the hydrocarbon appearance for
reservoir target based on cut off value from sensitivity test of less than 2,26 gr/cc.;X field is an oil field in West Natuna Basin with sandstone reservoir as
primary target. There was varying reservoir thickness, so the inversion method that
could only be applied to map reservoir thickness, which close to tuning thickness.
Based on sensitivity analysis, Acoustic Impedance parameters couldn’t
indicate hydrocarbon appearance for each well, so Acoustic Impedance cannot be
applied for reservoir characterization in this field. Density versus Acoustic
Impedance could map hydrocarbon appearance.
Shear velocity weren’t available where those data was needed for running
simultaneous inversion method. Predicting velocity shear would be carried out by
using several method such as Castagna, Gassmann, Parsial, Xu-White, and Lee. The
best estimated velocity shear would be used for inversion, The best estimated shear
velocity from Xu-White method because Xu-White’s poisson ratio log presents
similar trend with water saturation log (Sw). Moreover, Xu-White’s ratio aspect is
also considering porosity and clay volume value. Based on quality control result, Vp
model of Xu-White had minimum error ratio compared to Vp from log.
Simultaneous inversion with pre-stack and parsial stack data what can be used
for predicting P-Impedance, S-Impedance, and density from seismic data. Otherwise,
this method is also used not only for single wavelet but also multi wavelet. The
inversion result from this study can mapping out the hydrocarbon appearance for
reservoir target based on cut off value from sensitivity test of less than 2,26 gr/cc., X field is an oil field in West Natuna Basin with sandstone reservoir as
primary target. There was varying reservoir thickness, so the inversion method that
could only be applied to map reservoir thickness, which close to tuning thickness.
Based on sensitivity analysis, Acoustic Impedance parameters couldn’t
indicate hydrocarbon appearance for each well, so Acoustic Impedance cannot be
applied for reservoir characterization in this field. Density versus Acoustic
Impedance could map hydrocarbon appearance.
Shear velocity weren’t available where those data was needed for running
simultaneous inversion method. Predicting velocity shear would be carried out by
using several method such as Castagna, Gassmann, Parsial, Xu-White, and Lee. The
best estimated velocity shear would be used for inversion, The best estimated shear
velocity from Xu-White method because Xu-White’s poisson ratio log presents
similar trend with water saturation log (Sw). Moreover, Xu-White’s ratio aspect is
also considering porosity and clay volume value. Based on quality control result, Vp
model of Xu-White had minimum error ratio compared to Vp from log.
Simultaneous inversion with pre-stack and parsial stack data what can be used
for predicting P-Impedance, S-Impedance, and density from seismic data. Otherwise,
this method is also used not only for single wavelet but also multi wavelet. The
inversion result from this study can mapping out the hydrocarbon appearance for
reservoir target based on cut off value from sensitivity test of less than 2,26 gr/cc.]

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 Metadata

No. Panggil : T41474
Entri utama-Nama orang :
Entri tambahan-Nama orang :
Entri tambahan-Nama badan :
Subjek :
Penerbitan : [Place of publication not identified]: [Publisher not identified], 2012
Program Studi :
Bahasa : ind
Sumber Pengatalogan :
Tipe Konten : text
Tipe Media : unmediated ; computer
Tipe Carrier : volume ; online resources
Deskripsi Fisik : x, 72 pages : illustration ; 28 cm + appendix
Naskah Ringkas :
Lembaga Pemilik : Universitas Indonesia
Lokasi : Perpustakaan UI, Lantai 3
  • Ketersediaan
  • Ulasan
No. Panggil No. Barkod Ketersediaan
T41474 TERSEDIA
Ulasan:
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