Reihanati, Rani (2026) Karakterisasi Petrofisika dan Rock Typing Reservoir Batupasir Interval K3 Formasi Mangahewa Menggunakan Flow Zone Indicator dan Winland R35, Lapangan Kapuni, Cekungan Taranaki. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Lapangan Kapuni merupakan lapangan gas-kondensat onshore di Selandia Baru, dengan reservoir utama Formasi Mangahewa yang mengalami penurunan produksi signifikan. Penelitian ini bertujuan untuk karakterisasi petrofisika dan klasifikasi hydraulic flow unit (HFU) pada interval K3 Formasi Mangahewa menggunakan data wireline log sumur KA-14 dan core dari sumur KA-14, KA-19, dan KA-03. Karakterisasi petrofisika pada sumur KA-14 menggunakan density-derived porosity yang terkalibrasi paling baik terhadap data RCAL (R² = 0,390). Volume serpih dihitung menggunakan metode linear gamma ray, saturasi air menggunakan persamaan Indonesia yang dipilih berdasarkan hasil analisis Thomas-Stieber yang menunjukkan distribusi laminated dan dispersed shale, dengan Rw = 0,20 ohm·m dari Pickett Plot. Permeabilitas log dikalibrasi menggunakan koefisien Morris Biggs Gas yang menghasilkan R² tertinggi terhadap data RCAL. Kandungan gas pada reservoir di lapangan Kapuni dibuktikan dengan Fluid Replacement Modelling yang menghasilkan log Vp tersubstitusi gas berkorelasi dengan hasil Vp pada data log sonik aktualnya. Klasifikasi rock typing dilakukan menggunakan metode Flow Zone Indicator (FZI-RQI) dan Winland R35 pada 524 sampel core dari ketiga sumur. Kedua metode mengidentifikasi empat HFU. Metode FZI menghasilkan R² per HFU antara 0,668 hingga 0,955, sementara Winland R35 menunjukkan pemisahan kurva MICP yang lebih konsisten dan berurutan antar HFU. Validasi silang menggunakan kurva Mercury Injection Capillary Pressure mengkonfirmasi bahwa Winland R35 lebih representatif secara fisik dalam menangkap perbedaan karakteristik pore throat. HFU 4 merepresentasikan kualitas reservoir terbaik dan pada sumur KA-14 secara dominan dijumpai pada interval K3E Middle yang sesuai dengan persebaran litofasies tidal sand bar dan tidal channel berdasarkan data core yang tersedia.
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Kapuni Field is New Zealand's largest onshore gas-condensate field, with the Mangahewa Formation as its primary reservoir experiencing significant production decline. This study performs petrophysical characterization and hydraulic flow unit (HFU) classification of the K3 interval of the Mangahewa Formation using wireline log and core data from wells KA-14, KA-19, and KA-03. Petrophysical characterization on KA-14 as the anchor well employed density-derived porosity, which demonstrated best calibration against RCAL data (R² = 0.390). Shale volume was calculated using the linear gamma ray method, and water saturation was computed using the Indonesia formula selected based on Thomas-Stieber crossplot analysis indicating laminated and dispersed shale distributions, with Rw = 0.20 ohm·m derived from Pickett Plot. Log permeability was calibrated using the Morris Biggs Gas coefficient, yielding the highest R² against RCAL data. The gas content in the reservoir at the Kapuni field was verified using Fluid Replacement Modeling which produced a gas-substituted Vp log that correlated with the Vp results from the actual sonic log data. Rock typing was performed using the Flow Zone Indicator (FZI-RQI) and Winland R35 methods on 524 core samples from the three wells. Both methods identified four optimal HFUs. The FZI method produced per-HFU R² values between 0.668 and 0.955, while Winland R35 demonstrated more consistent and sequential MICP curve separation between HFUs. Cross-validation using Mercury Injection Capillary Pressure curves confirmed that Winland R35 is more physically representative in capturing actual pore throat characteristic. HFU 4 represents the best reservoir quality and, based on available core data from KA-14, is predominantly observed within the K3E Middle interval, consistent with the distribution of tidal sand bar and tidal channel lithofacies.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Rock Type, Flow Zone Indicator, Winland R35, Formasi Mangahewa, Lapangan Kapuni, Mangahewa Formation, Kapuni Field |
| Subjects: | Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology T Technology > TN Mining engineering. Metallurgy > TN269 Prospecting--Geophysical methods |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Rani Reihanati |
| Date Deposited: | 18 Jul 2026 04:50 |
| Last Modified: | 18 Jul 2026 04:50 |
| URI: | http://repository.its.ac.id/id/eprint/134898 |
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