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KARAKTERISASI RESERVOIR DAN ANALISIS FASIES FORMASI KEUTAPANG, LAPANGAN RAJA, CEKUNGAN SUMATRA UTARA

RESERVOIR CHARACTERIZATION AND FACIES ANALYSIS OF KEUTAPANG FORMATION, RAJA FIELD, NORTH SUMATRA

Undergraduate Theses from JBPTITBPP / 2018-07-31 13:46:54
Oleh : DAVID LEE LUMBAN RAJA (NIM : 12013066), S1 - Geological Engineering-FITB
Dibuat : 2017-07-12, dengan 8 file

Keyword : Lapangan Raja, Cekungan Sumatra Utara, Fasies, Petrofisika, Porositas, Saturasi air, Volume serpih

Lapangan Raja merupakan salah satu lapangan minyak bumi di Cekungan Sumatra Utara. Secara administratif Lapangan Raja terletak di Kecamatan Rantau, Kabupaten Aceh Tamiang, Provinsi Aceh. Lapangan ini terdiri dari Formasi Keutapang dan Formasi Seurula. Penelitian dilakukan pada Formasi Keutapang untuk menentukan fasies lingkungan pengendapan dan karakter dari 2 reservoir yang terdapat pada Lapangan Raja ini, yaitu Reservoir A pada kedalaman di sekitar 400 m di bawah permukaan laut dan Reservoir B pada kedalaman di sekitar 550 m di bawah permukaan laut. Data yang digunakan dalam penelitian ini berupa data batuan inti, data log tali kawat, data seismik 3D, dan data sejarah produksi.

Hasil analisis batuan inti menunjukkan bahwa Reservoir A terdiri dari litologi batupasir masif yang diinterpretasikan sebagai batupasir endapan upper shoreface, sedangkan Reservoir B terdiri dari litologi batupasir lempungan karbonatan yang diinterpretasikan sebagai endapan lower shoreface. Hasil analisis fosil jejak yang terdapat pada batuan inti menunjukkan Reservoir B merupakan endapan zona litoral – sandy shore. Penentuan karakter petrofisik menggunakan data log tali kawat. Karakter petrofisik yang dianalisis adalah porositas efektif, saturasi air, dan volume serpih.

Hasil karakterisasi Reservoir A menunjukkan porositas efektif rata-rata 17%, volume serpih rata-rata 22%, dan saturasi air rata-rata 68%, sedangkan Reservoir B menunjukkan porositas efektif rata-rata 14%, volume serpih rata-rata 26%, dan saturasi air rata-rata 76%.

Deskripsi Alternatif :

Raja Field is one of the oil fields in the North Sumatra Basin. Administratively Raja Field located in Rantau Sub-District, Aceh Tamiang District, Aceh Province. The field consists of Keutapang Formation and Seurula Formations. The study was conducted on Keutapang Formation to determine the facies of deposition environments and the character of the two reservoirs found on this Raja Field, Reservoir A at a depth of about 400 m below sea level and Reservoir B at a depth of about 550 m below sea level. The data used in this research are core data, wireline log data, 3D seismic data, and production history data.

The results of core analysis show that Reservoir A consists of massive sandstone lithology which is interpreted as upper shoreface sedimentary sandstone, while Reservoir B consists of shaly sandstone lithology that is interpreted as lower shoreface deposit. The results of ichnofossil analysis found in core indicate Reservoir B is a litoral zone deposit - sandy shore deposit. The determination of the petrophysical character uses wireline log data. Petrophysical characters analyzed were effective porosity, water saturation, and shale volume.

Reservoir A shows an average effective porosity of 17%, average shale volume 22%, and average water saturation of 68%, while Reservoir B shows an average effective porosity of 14%, average shale volume 26% and water saturation averaged 76%.


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