Khoirunnisa, Syafhira Najwa (2026) Hierarki Karakterisasi Reservoir Menggunakan Hydraulic Flow Unit–Flow Zone Indicator (HFU-FZI), Winland R35, Dan Improved Stratigraphic Modified Lorenz (ISML) Pada Lapangan D-15, Belanda. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Reservoir batupasir D-15 pada Formasi Klaverbank didominasi oleh litologi quartz arenite dengan sistem pori utama berupa pori intergranular. Meskipun litologinya relatif homogen, pada data core menunjukkan variasi permeabilitas hingga beberapa orde besaran pada rentang porositas yang berdekatan. Variasi tersebut berkaitan dengan perbedaan tekstur batuan serta proses diagenesis, di mana kaolinit pengisi pori, siderit, ferroan dolomit, sementasi barit, dan pembentukan pseudomatrix memengaruhi geometri pore throat dan konektivitas jaringan pori. Penelitian ini bertujuan untuk mengevaluasi heterogenitas aliran reservoir melalui integrasi metode Hydraulic Flow Unit–Flow Zone Indicator (HFU-FZI), Winland R35, Improved Stratigraphic Modified Lorenz Plot (ISML), serta Self-Organizing Map (SOM) untuk karakterisasi tipe batuan hidraulik dan prediksi permeabilitas pada interval yang tidak memiliki data core. Analisis HFU-FZI mengklasifikasikan reservoir menjadi enam tipe batuan hidraulik (RT-1 hingga RT-6) yang menunjukkan peningkatan kualitas aliran. Analisis Winland R35 menunjukkan peningkatan ukuran pore throat secara bertahap dari kelas micropore pada RT-1 hingga kelas megapore pada RT-6, sesuai dengan hasil petrografi yang menunjukkan bahwa rock type berkualitas tinggi memiliki sistem pori yang lebih terbuka dan konektivitas yang lebih baik. Analisis ISML menunjukkan bahwa interval dengan storage capacity yang relatif serupa dapat memiliki flow capacity yang berbeda secara signifikan, sehingga mencerminkan variasi efisiensi aliran antar zona reservoir. Prediksi permeabilitas berbasis SOM-HFU menghasilkan nilai R² sebesar 0,782 dan 0,812, lebih tinggi dibandingkan metode Morris–Biggs Gas (R² = 0,451). Secara keseluruhan, hasil penelitian menunjukkan bahwa heterogenitas permeabilitas pada reservoir D-15 lebih dipengaruhi oleh perkembangan sistem pori akibat variasi tekstur batuan dan proses diagenesis dibandingkan oleh porositas maupun litologi secara terpisah.
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The D-15 sandstone reservoir of the Klaverbank Formation consists predominantly of quartz arenite with an intergranular pore system. Despite its relatively homogeneous lithology, petrographic observations and core measurements reveal permeability variations of several orders of magnitude within overlapping porosity ranges. These differences are linked to variations in depositional texture and subsequent diagenetic modification, where pore-filling kaolinite, siderite, ferroan dolomite, barite cementation, and pseudomatrix alter pore-throat geometry and reduce pore connectivity. To investigate the origin and distribution of reservoir flow heterogeneity, this study integrates Hydraulic Flow Unit–Flow Zone Indicator (HFU-FZI), Winland R35, Improved Stratigraphic Modified Lorenz Plot (ISML), and Self-Organizing Map (SOM) for hydraulic rock type characterization and permeability prediction in uncored intervals. HFU-FZI analysis identified six hydraulic rock types (RT-1 to RT-6), reflecting a gradual transition from poor- to high-quality flow units despite similar porosity values. Winland R35 analysis demonstrated a corresponding increase in effective pore-throat size from micropore to megapore classes, consistent with petrographic evidence that higher-quality rock types retain more open and better-connected pore networks. ISML analysis distinguished intervals with comparable storage potential from those contributing disproportionately to fluid flow, revealing pronounced stratigraphic differences in flow efficiency. SOM-based permeability prediction produced R² values of 0.782 and 0.812, substantially exceeding the performance of the conventional Morris–Biggs Gas equation (R² = 0.451). Collectively, these results indicate that permeability heterogeneity in the D-15 reservoir is best explained by the evolution of the pore system through depositional texture and diagenetic modification, while porosity and lithology alone provide only limited discrimination of reservoir flow behavior.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Hydraulic Flow Unit (HFU), Winland R35, Improved Stratigraphic Modified Lorenz Plot (ISML), dan Self-Organizing Map (SOM). |
| Subjects: | Q Science > QA Mathematics > QA278.2 Regression Analysis. Logistic regression Q Science > QA Mathematics > QA278.55 Cluster analysis Q Science > QA Mathematics > QA401 Mathematical models. Q Science > QA Mathematics > QA402 System analysis. Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport. Erosion. |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Syafhira Najwa Khoirunnisa |
| Date Deposited: | 22 Jul 2026 01:27 |
| Last Modified: | 22 Jul 2026 01:27 |
| URI: | http://repository.its.ac.id/id/eprint/136030 |
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