Pemodelan Statik 3D dan Perhitungan Volume Hidrokarbon pada Interval "A, B, C", Lapangan "SMITH", Formasi Talangakar, Sub Cekungan Palembang Selatan, Cekungan Sumatra Selatan

Althaf Baihaqi, Ir. Rahmadi Hidayat, S.T., M.Eng., Ph.D., IPP ; Ir. Moch. Indra Novian, S.T., M.Eng., IPP

2026 | Skripsi | TEKNIK GEOLOGI

Penelitian ini bertujuan menentukan fasies reservoir, geometri, heterogenitas, distribusi fasies dan properti reservoir, serta menghitung volume hidrokarbon melalui pemodelan statik tiga dimensi menggunakan perangkat lunak Petrel 2020. Data yang digunakan meliputi wireline log dua sumur produksi, mudlog, report side wall core, data petrofisika, serta data seismik berupa depth structure map dan isopach thickness map. Hasil penelitian menunjukkan bahwa interval A, B, dan C diendapkan pada lingkungan lower delta plain dengan asosiasi fasies distributary channel, interdistributary bay, dan crevasse splay. Reservoir batupasir utama berkembang mengikuti geometri distributary channel berarah utara–selatan dengan nilai porositas tertinggi pada fasies distributary channel (0,15–0,27), sedangkan reservoir utama Interval C berupa crevasse splay. Analisis kontak fluida mengidentifikasi gas water contact pada kedalaman 6116 ft pada Interval A dan oil water contact pada kedalaman 6387 ft pada Interval B dan C. Perhitungan volumetrik menghasilkan Gas Initially in Place (GIIP) sebesar 333 MMSCF pada Interval A serta Stock Tank Oil Initially in Place (STOIIP) sebesar 2.34 MMSTB pada Interval B dan C. Hasil pemodelan statik 3D ini memberikan gambaran distribusi reservoir dan estimasi cadangan yang lebih akurat sebagai dasar pengembangan lanjutan Lapangan "SMITH".

The "SMITH" Field in the Talang Akar Formation, South Palembang Sub-Basin, South Sumatra Basin, requires reserve evaluation to support field development and production enhancement. This study aims to characterize reservoir facies, geometry, heterogeneity, facies distribution, and reservoir properties, as well as to estimate hydrocarbon volumes through 3D static modeling using Petrel 2020. The study utilized wireline logs from two production wells, supported by mudlog, side wall core reports, petrophysical data, and seismic-derived depth structure and isopach maps. Results indicate that the A, B, and C intervals were deposited in a lower delta plain environment and comprise distributary channel, interdistributary bay, and crevasse splay facies. Sandstone reservoirs are distributed along north-south trending distributary channels, with the highest porosity occurring within distributary channel facies (0.15–0.27), while Interval C is dominated by crevasse splay deposits. Fluid contact analysis identified a gas-water contact at 6116 ft in Interval A and an oil-water contact at 6387 ft in Intervals B and C. Volumetric calculations yielded a Gas Initially in Place (GIIP) of 3 MMSCF for Interval A and a Stock Tank Oil Initially in Place (STOIIP) of 2.34 MMSTB for Intervals B and C. The resulting 3D static model provides a reliable basis for future reservoir development and reserve management in the "SMITH" Field.

Kata Kunci : Pemodelan statik 3D, Formasi Talangakar, Fasies, Volume hidrokarbon, STOIIP, GIIP