Sitompul, Bram Gamaliel (2026) Karakterisasi Reservoir Menggunakan Metode Inversi Extended Elastic Impedance (EEI) Untuk Diskriminasi Litologi, Fluida, Dan, Properti Elastik: Studi Kasus Lapangan Poseidon, Australia. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Lapangan Poseidon merupakan salah satu lapangan gas pada Cekungan Browse, Australia, yang tersusun oleh reservoir batupasir Formasi Plover dengan kompleksitas litologi dan variasi fluida yang memerlukan karakterisasi reservoir secara terintegrasi. Penelitian ini bertujuan untuk mengidentifikasi distribusi litologi, fluida, dan properti elastik reservoir menggunakan metode inversi Extended Elastic Impedance (EEI). Data yang digunakan meliputi data seismik 3D dan data log sumur yang terdiri atas log kecepatan gelombang P (Vp), kecepatan gelombang S (Vs), densitas, gamma ray, porositas, saturasi air, dan volume serpih. Tahapan penelitian meliputi analisis petrofisika, pemodelan fisika batuan, ekstraksi atribut elastik, inversi model-based untuk memperoleh properti elastik dan petrofisika yang sensitive terhadap EEI pada rentang sudut χ −90° hingga +90°, serta analisis korelasi terhadap parameter reservoir. Hasil penelitian menunjukkan bahwa atribut EEI memiliki sensitivitas yang berbeda terhadap parameter reservoir pada sudut rotasi tertentu. Korelasi optimum diperoleh untuk diskriminasi litologi dan fluida, yang ditunjukkan oleh hubungan kuat antara EEI dengan parameter volume serpih, λρ, λ/μ, dan saturasi air. Analisis kuantitatif menunjukkan bahwa diskriminasi litologi memberikan hasil optimum pada sudut rotasi χ = 43° terhadap parameter volume shale dengan koefisien korelasi sebesar 0,74. Sementara itu, diskriminasi fluida memberikan hasil optimum pada sudut rotasi χ = 23° terhadap parameter saturasi air dengan koefisien korelasi sebesar 0,80. Korelasi optimum tersebut menunjukkan hubungan yang kuat antara atribut EEI dengan parameter reservoir, sehingga mampu membedakan karakteristik litologi dan fluida secara efektif. Integrasi hasil inversi EEI dan analisis fisika batuan menunjukkan bahwa metode EEI efektif dalam diskriminasi litologi dan fluida dibandingkan atribut impedansi konvensional, sehingga dapat digunakan untuk mendukung karakterisasi reservoir dan identifikasi zona prospek hidrokarbon pada Lapangan Poseidon.=====================================================================================================================================
The Poseidon Field, located in the Browse Basin, Australia, is a gas-bearing reservoir hosted within the Plover Formation sandstone, characterized by lithological complexity and fluid variations that require comprehensive reservoir characterization. This study aims to identify the distribution of lithology, fluid content, and elastic properties using the Extended Elastic Impedance (EEI) inversion method. The dataset consists of 3D seismic data and well logs, including P-wave velocity (Vp), S-wave velocity (Vs), density, gamma ray, porosity, water saturation, and shale volume logs. The workflow includes petrophysical analysis, rock physics modeling, elastic attribute extraction, model-based seismic inversion to obtain elastic and petrophysics property sensitive to EEI log computation over a χ rotation angle range from −90° to +90°, and correlation analysis with reservoir parameters. The results indicate that EEI attributes exhibit varying sensitivities to reservoir properties at different rotation angles. Optimum correlations were obtained for lithology and fluid discrimination, as demonstrated by strong relationships between EEI and shale volume, λρ, λ/μ, and water saturation. Quantitative analysis shows that lithology discrimination achieves the optimum result at a rotation angle of χ = 43° for the volume shale parameter, with a correlation coefficient of 0.74. Meanwhile, fluid discrimination achieves the optimum result at a rotation angle of χ = 23° for the water saturation parameter, with a correlation coefficient of 0.80. These optimum correlations indicate a strong relationship between the EEI attribute and the reservoir parameters, enabling effective discrimination of lithology and fluid characteristics. The integration of EEI inversion results and rock physics analysis shows that the EEI method is effective for lithology and fluid discrimination compared to conventional impedance attributes, and can therefore be used to support reservoir characterization and the identification of prospective hydrocarbon zones in the Poseidon Field.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Inversi Seismik, Karakterisasi Reservoir, Lapangan Poseidon, Extended Elastic Impedance, Seismic Inversion, Reservoir Characterization, Rock Physics, Poseidon Field. |
| Subjects: | T Technology > T Technology (General) T Technology > T Technology (General) > T11 Technical writing. Scientific Writing T Technology > T Technology (General) > T385 Visualization--Technique |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Bram Gamaliel Sitompul |
| Date Deposited: | 21 Jul 2026 04:41 |
| Last Modified: | 21 Jul 2026 04:41 |
| URI: | http://repository.its.ac.id/id/eprint/136045 |
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