[ABSTRAK
Lapangan AAA merupakan lapangan gas yang terdapat pada lingkungan DeltaMahakam, Cekungan Kutai, Kalimantan Timur. Lapangan AAA merupakan bagiandari lapangan gas dengan produksi terbesar di Indonesia yang telah dieksplorasi dandiproduksi lebih dari 40 tahun. Salah satu tahapan penting setelah proses eksplorasiadalah mengaplikasikan metode karakterisasi reservoar untuk pengembanganlapangan. Karakterisasi reservoar dalam penentuan distribusi lithologi dan fluidasangat penting dilakukan untuk mengetahui daerah berprospek ekonomis yang belumditembus oleh sumur produksi.Pada penelitian ini karakterisasi reservoar yang digunakan adalah metode AnalisaAVO dan Extended Elastic Impedance (EEI). Analisis AVO mengunakan data prestack3D gather dan bantuan velocity cube. Data DTS yang digunakan pada penelitianini terdapat pada sumur 3A45, 3A50, dan 3A45. Metode Extended Elastic Impedance(EEI) dimulai dengan penentuan sudut Chi (X) pada nilai koeffisien korelasi yangmaksimum (mendekati nilai 1) dan analisis crossplot untuk menentukan nilai cut-offindikator lithologi dan indikator fluida pada setiap parameter fisika dari data sumur.Hasil analisis menyebutkan bahwa fluida pada daerah penelitian merupakan AVOkelas III. Indikator lihtologi (reservoar dan non reservoar) dapat dipisahkan denganparameter Gamma Ray (reservoar bernilai 20 – 60 GAPI) dan Density (reservoarbernilai 1.75 – 2.17 g/cc). Sedangkan indikator fluida (gas dan water) dapatdipisahkan dengan parameter Lambda-Rho (gas bernilai 1.5 – 9 Gpa*g/cc), Lambdaper 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 GTS3A menyebutkan bahwa inversi Lambda-Rho mempunyai akurasi 78.57% (MFA) dan85.71% (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).
ABSTRACT
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 productionin Indonesia already explored and produced almost over 40 years. One of importantsteps after exploration of the field is to conduct a reservoir characterization for fielddevelopment. Reservoir characterization to determine lithology distribution and fluidcontent is very important to know the prospect area which has economical values andnot penetrated yet by infill wells or production wells.Reservoir characterization method that has been used in this study are AVO analysisand Extended Elastic Impedance (EEI). Pre-stack 3D gather data and velocity cubeused for AVO analysis in this study. DTS logs only available in 3A45, 3A50, and3A55. Extended Elastic Impedance method started with determination of Chi (X)angle that has maximum correlation coefficient (near to 1 value) and cross-plotanalysis to determine cut-off value for lithology indicator and fluid indicator in eachwell data parameter.Analysis results show that fluid class in this study is AVO class III. Lithologyindicator (reservoir and non reservoir) can be separated by Gamma Ray (value ofreservoir 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 (valueof 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 isbetween 0.16 – 0.35). Results of Extended Elastic Impedance inversion in GTS 3Ashow 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) and85.71% accuracy (in MFB), Vp per Vs inversion has 71.42% accuracy (in MFA) and71.42% (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 productionin Indonesia already explored and produced almost over 40 years. One of importantsteps after exploration of the field is to conduct a reservoir characterization for fielddevelopment. Reservoir characterization to determine lithology distribution and fluidcontent is very important to know the prospect area which has economical values andnot penetrated yet by infill wells or production wells.Reservoir characterization method that has been used in this study are AVO analysisand Extended Elastic Impedance (EEI). Pre-stack 3D gather data and velocity cubeused for AVO analysis in this study. DTS logs only available in 3A45, 3A50, and3A55. Extended Elastic Impedance method started with determination of Chi (X)angle that has maximum correlation coefficient (near to 1 value) and cross-plotanalysis to determine cut-off value for lithology indicator and fluid indicator in eachwell data parameter.Analysis results show that fluid class in this study is AVO class III. Lithologyindicator (reservoir and non reservoir) can be separated by Gamma Ray (value ofreservoir 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 (valueof 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 isbetween 0.16 – 0.35). Results of Extended Elastic Impedance inversion in GTS 3Ashow 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) and85.71% accuracy (in MFB), Vp per Vs inversion has 71.42% accuracy (in MFA) and71.42% (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 productionin Indonesia already explored and produced almost over 40 years. One of importantsteps after exploration of the field is to conduct a reservoir characterization for fielddevelopment. Reservoir characterization to determine lithology distribution and fluidcontent is very important to know the prospect area which has economical values andnot penetrated yet by infill wells or production wells.Reservoir characterization method that has been used in this study are AVO analysisand Extended Elastic Impedance (EEI). Pre-stack 3D gather data and velocity cubeused for AVO analysis in this study. DTS logs only available in 3A45, 3A50, and3A55. Extended Elastic Impedance method started with determination of Chi (X)angle that has maximum correlation coefficient (near to 1 value) and cross-plotanalysis to determine cut-off value for lithology indicator and fluid indicator in eachwell data parameter.Analysis results show that fluid class in this study is AVO class III. Lithologyindicator (reservoir and non reservoir) can be separated by Gamma Ray (value ofreservoir 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 (valueof 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 isbetween 0.16 – 0.35). Results of Extended Elastic Impedance inversion in GTS 3Ashow 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) and85.71% accuracy (in MFB), Vp per Vs inversion has 71.42% accuracy (in MFA) and71.42% (in MFB), Poisson Ration has 71.42% accuracy (in MFA) and 78.57%accuracy (in MFB).] |
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