[
ABSTRAKLapangan AAA merupakan lapangan gas yang terdapat pada lingkungan Delta
Mahakam, Cekungan Kutai, Kalimantan Timur. Lapangan AAA merupakan bagian
dari lapangan gas dengan produksi terbesar di Indonesia yang telah dieksplorasi dan
diproduksi lebih dari 40 tahun. Salah satu tahapan penting setelah proses eksplorasi
adalah mengaplikasikan metode karakterisasi reservoar untuk pengembangan
lapangan. Karakterisasi reservoar dalam penentuan distribusi lithologi dan fluida
sangat penting dilakukan untuk mengetahui daerah berprospek ekonomis yang belum
ditembus oleh sumur produksi.
Pada penelitian ini karakterisasi reservoar yang digunakan adalah metode Analisa
AVO dan Extended Elastic Impedance (EEI). Analisis AVO mengunakan data prestack
3D gather dan bantuan velocity cube. Data DTS yang digunakan pada penelitian
ini terdapat pada sumur 3A45, 3A50, dan 3A45. Metode Extended Elastic Impedance
(EEI) dimulai dengan penentuan sudut Chi (X) pada nilai koeffisien korelasi yang
maksimum (mendekati nilai 1) dan analisis crossplot untuk menentukan nilai cut-off
indikator lithologi dan indikator fluida pada setiap parameter fisika dari data sumur.
Hasil analisis menyebutkan bahwa fluida pada daerah penelitian merupakan AVO
kelas III. Indikator lihtologi (reservoar dan non reservoar) dapat dipisahkan dengan
parameter Gamma Ray (reservoar bernilai 20 – 60 GAPI) dan Density (reservoar
bernilai 1.75 – 2.17 g/cc). Sedangkan indikator fluida (gas dan water) dapat
dipisahkan dengan parameter Lambda-Rho (gas bernilai 1.5 – 9 Gpa*g/cc), Lambda
per Mu (gas bernilai 0.5 – 2.5), Vp per Vs (gas bernilai 1.5 – 2.2), dan Poisson Ratio
(gas bernilai 0.16 – 0.35). Hasil inversi Extended Elastic Impedance (EEI) pada GTS
3A menyebutkan bahwa inversi Lambda-Rho mempunyai akurasi 78.57% (MFA) dan
85.71% (MFB), inversi Lambda per Mu mempunyai akurasi 50% (MFA) dan 85.71%
(MFB), inversi Vp per Vs mempunyai akurasi 71.42% (MFA) dan 71.42% (MFB),
Inversi Poisson Ratio mempunyai akurasi sebesar 71.42% (MFA) dan 78.57% (MFB).
ABSTRACTAAA field is a gas field that located in Delta Mahakam environment, Kutei Basin,
East Kalimantan. AAA field is a part of giant gas field which has biggest production
in Indonesia already explored and produced almost over 40 years. One of important
steps after exploration of the field is to conduct a reservoir characterization for field
development. Reservoir characterization to determine lithology distribution and fluid
content is very important to know the prospect area which has economical values and
not penetrated yet by infill wells or production wells.
Reservoir characterization method that has been used in this study are AVO analysis
and Extended Elastic Impedance (EEI). Pre-stack 3D gather data and velocity cube
used for AVO analysis in this study. DTS logs only available in 3A45, 3A50, and
3A55. Extended Elastic Impedance method started with determination of Chi (X)
angle that has maximum correlation coefficient (near to 1 value) and cross-plot
analysis to determine cut-off value for lithology indicator and fluid indicator in each
well data parameter.
Analysis results show that fluid class in this study is AVO class III. Lithology
indicator (reservoir and non reservoir) can be separated by Gamma Ray (value of
reservoir between 20 – 60 GAPI) and Density (value of reservoir is between 1.75 –
2.17 g/cc). Fluid indicator (gas and water) can be separated by Lambda-Rho (value
of gas is between 1.5 – 9 Gpa*g/cc), Lambda per Mu (value of gas is between 0.5 –
2.5), Vp per Vs (value of gas is between 1.5 – 2.2), and Poisson Ratio (value of gas is
between 0.16 – 0.35). Results of Extended Elastic Impedance inversion in GTS 3A
show that Lambda-Rho inversion has 78.57% accuracy (in MFA) and 85.71%
accuracy (in MFB), Lambda per Mu inversion has 50% accuracy (in MFA) and
85.71% accuracy (in MFB), Vp per Vs inversion has 71.42% accuracy (in MFA) and
71.42% (in MFB), Poisson Ration has 71.42% accuracy (in MFA) and 78.57%
accuracy (in MFB).;AAA field is a gas field that located in Delta Mahakam environment, Kutei Basin,
East Kalimantan. AAA field is a part of giant gas field which has biggest production
in Indonesia already explored and produced almost over 40 years. One of important
steps after exploration of the field is to conduct a reservoir characterization for field
development. Reservoir characterization to determine lithology distribution and fluid
content is very important to know the prospect area which has economical values and
not penetrated yet by infill wells or production wells.
Reservoir characterization method that has been used in this study are AVO analysis
and Extended Elastic Impedance (EEI). Pre-stack 3D gather data and velocity cube
used for AVO analysis in this study. DTS logs only available in 3A45, 3A50, and
3A55. Extended Elastic Impedance method started with determination of Chi (X)
angle that has maximum correlation coefficient (near to 1 value) and cross-plot
analysis to determine cut-off value for lithology indicator and fluid indicator in each
well data parameter.
Analysis results show that fluid class in this study is AVO class III. Lithology
indicator (reservoir and non reservoir) can be separated by Gamma Ray (value of
reservoir between 20 – 60 GAPI) and Density (value of reservoir is between 1.75 –
2.17 g/cc). Fluid indicator (gas and water) can be separated by Lambda-Rho (value
of gas is between 1.5 – 9 Gpa*g/cc), Lambda per Mu (value of gas is between 0.5 –
2.5), Vp per Vs (value of gas is between 1.5 – 2.2), and Poisson Ratio (value of gas is
between 0.16 – 0.35). Results of Extended Elastic Impedance inversion in GTS 3A
show that Lambda-Rho inversion has 78.57% accuracy (in MFA) and 85.71%
accuracy (in MFB), Lambda per Mu inversion has 50% accuracy (in MFA) and
85.71% accuracy (in MFB), Vp per Vs inversion has 71.42% accuracy (in MFA) and
71.42% (in MFB), Poisson Ration has 71.42% accuracy (in MFA) and 78.57%
accuracy (in MFB)., AAA field is a gas field that located in Delta Mahakam environment, Kutei Basin,
East Kalimantan. AAA field is a part of giant gas field which has biggest production
in Indonesia already explored and produced almost over 40 years. One of important
steps after exploration of the field is to conduct a reservoir characterization for field
development. Reservoir characterization to determine lithology distribution and fluid
content is very important to know the prospect area which has economical values and
not penetrated yet by infill wells or production wells.
Reservoir characterization method that has been used in this study are AVO analysis
and Extended Elastic Impedance (EEI). Pre-stack 3D gather data and velocity cube
used for AVO analysis in this study. DTS logs only available in 3A45, 3A50, and
3A55. Extended Elastic Impedance method started with determination of Chi (X)
angle that has maximum correlation coefficient (near to 1 value) and cross-plot
analysis to determine cut-off value for lithology indicator and fluid indicator in each
well data parameter.
Analysis results show that fluid class in this study is AVO class III. Lithology
indicator (reservoir and non reservoir) can be separated by Gamma Ray (value of
reservoir between 20 – 60 GAPI) and Density (value of reservoir is between 1.75 –
2.17 g/cc). Fluid indicator (gas and water) can be separated by Lambda-Rho (value
of gas is between 1.5 – 9 Gpa*g/cc), Lambda per Mu (value of gas is between 0.5 –
2.5), Vp per Vs (value of gas is between 1.5 – 2.2), and Poisson Ratio (value of gas is
between 0.16 – 0.35). Results of Extended Elastic Impedance inversion in GTS 3A
show that Lambda-Rho inversion has 78.57% accuracy (in MFA) and 85.71%
accuracy (in MFB), Lambda per Mu inversion has 50% accuracy (in MFA) and
85.71% accuracy (in MFB), Vp per Vs inversion has 71.42% accuracy (in MFA) and
71.42% (in MFB), Poisson Ration has 71.42% accuracy (in MFA) and 78.57%
accuracy (in MFB).]
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