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Abstrak :
ABSTRAK
Kompartemen reservoar Lapangan Tamiang, Cekungan Sumatera Utara telah ditentukan berdasarkan analisis sekatan patahan. Lapangan Tamiang adalah lapangan tua yang menerapkan Oil Recovery Enhanced (EOR). EOR merupakan teknik untuk meningkatkan produksi dengan salah satu tekniknya adalah injeksi waterflooding. Analisis sekatan patahan menjadi informasi yang penting untuk melakukan injeksi waterflooding. Tujuan dari tesis ini adalah untuk menyelidiki karakteristik tiap patahan dalam hal sekatan tertutup atau terbuka dengan throw, shale gouge ratio (SGR), weight SGR, dan juxtaposisi. Tahapan analisis yang dilakukan adalah normalisasi gamma ray untuk mendapatkan volume shale, kemudian menganalisis sifat patahan dengan menggunakan Allan Diagram, lalu melakukan transmisibilitas multiplier, dan menambahkan parameter bulk modulus. Analisis kemudian divalidasi dengan sumur produksi dan injeksi. Patahan yang dianalisis berjumlah 23 patahan dengan dua perbedaan dipping, salah satu dipping ke barat laut dan yang lainnya ke arah tenggara. Kemudian, hasil dari arah patahan adalah sinistral dengan arah dari barat laut ke tenggara. Hasil penelitian menunjukkan bahwa lima kompartemen telah diidentifikasi, yang dibatasi oleh empat struktur utama. Sekatan patahan tertutup dan terbuka berbeda tiap layer zone. Pada zona 400 dan 560 patahan umumnya merupakan sekatan patahan tertutup. Untuk zona 600, 770 dan 800, patahan lebih dominan sekatan patahan terbuka. Zona 400, 560 dan 600, bulk modulus, zona patahan terbuka berada di barat daya. Sedangkan zona 770 dan 800 berada di timur laut. Adanya oblique patahan dan throw yang membuat perbedaan patahan tertutup dan patahan terbuka tiap layer berbeda. Hubungan antara karakter patahan (SGR, WSGR, throw, juxtaposisi), bulk modulus dan transmisibilitas menunjukkan adanya hubungan saling terintegrasi.

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ABSTRACT
The reservoir compartments of Tamiang field, North Sumatra Basin has been properly determined based on the Sekatan fault analysis. Tamiang field is a mature field and have been stage of secondary recovery. Therefore, Tamiang field needs strategy to enhance production by applying Enhanced Oil Recovery (EOR). One of the EOR techniques is waterflooding, which is intended to mantain reservoir pressure and increase the oil recovery. Thus, the fault seal analysis become significant information in performing water flooding. The objective paper is to investigate the characteristic of fault in term of fault sealing or fault leaking by analyzing the throw, shale gouge ratio (SGR), weigth SGR, and juxtaposition. All these parameters are associated with fault sealing and non fault sealing zone, which is used as basis to determine water flooding, and making reservoir compartement. Phase of analysis are normalization gamma ray to estimate shale volume, then using Allan diagram to analyze behavior of faults, transmissibility multiplier and the next adding parameter of bulk modulus. Then the analysis is validated with production and injection wells. Taming field has 23 faults with two difference dipping, one dipping to northwest and the other to south east. Thus, the fault direction is sinistral with direction from northwest to south east. The result shows that four compartments have been identified, which is bounded by three main structure. Fault sealing and fault leaking are different from each layer zone. In zones of 400 and 560, faults are generally fault sealing. For zones 600, 770 and 800, more dominant fault leaking. Zones 400, 560 and 600, bulk modulus of fault sealing zones are in the southwest. While zones 770 and 800 are in the northeast. The existence of oblique faults and throws that make the difference fault sealing and fault leaking each layer differently. The relationship between the fault properties (SGR, WSGR, throw, juxtaposition), bulk modulus and transmissibility indicate an integrated relationship.

Abstrak :
Lapangan "IM" merupakan salah satu lapangan eksplorasi minyak dan gas bumi yang berada di Cekungan Sumatera Utara. Telah teridentifikasi sebelumnya bahwa pada lapangan ini ditemukan hidrokarbon berupa gas condensate. Penelitian ini bertujuan untuk mengarakterisasi reservoir dalam hal persebaran litologi dan kandungan fluidanya. Penelitian mencakup target reservoir karbonat yang berada pada Middle Miocene Malacca Limestone. Data yang digunakan dalam penelitian ini, yaitu data seismik 3D dan dua data sumur. Metode inversi simultan diterapkan untuk mengolah data agar tujuan penelitian dapat tercapai. Metode inversi simultan menghasilkan model Impedansi P (Zp), Impedansi S (Zs), dan Densitas. Didapatkan hasil pada reservoir gas nilai impedansi P (Zp) sekitar 16542-18917 (ft/s*g/cc) dan impedansi S (Zs) sekitar 8375 (ft/s*g/cc) sedangkan pada reservoir air nilai impedansi P (Zp) sebesar 21292-23667 (ft/s*g/cc) dan impedansi S (Zs) sekitar 18500-20525 (ft/s*g/cc). Hasil tersebut kemudian ditransformasi menjadi parameter Lame. Parameter Lame merupakan parameter elastik yang terdiri dari Lambda-Rho dan Mu-Rho. Masing-masing parameter tersebut menjelaskan mengenai sifat inkompressibilitas fluida dan kekakuan batuan. Hasil penelitian menunjukkan persebaran reservoir yang memiliki arah orientasi Barat Laut-Tenggara.

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The "IM" field is an oil and gas exploration field located in the North Sumatra Basin. It was previously identified that in this field hydrocarbons were found in the form of gas condensate. This study aims to characterize the reservoir in terms of lithological distribution and fluid content. The research includes carbonate reservoir targets located in Middle Miocene Malacca Limestone. The data used in this study are 3D seismic data and two well data. Simultaneous inversion method is applied to process data so that research objectives can be achieved. The simultaneous inversion method produces P-Impedance (Zp), S-Impedance (Zs), and Density models. The results show that in the gas reservoir the P (Zp) impedance value is around 16542-18917 (ft/s*g/cc) and the S (Zs) impedance is around 8375 (ft/s*g/cc) while in the water reservoir the P impedance value (Zp ) of 21292-23667 (ft/s*g/cc) and the impedance S (Zs) is around 18500-20525 (ft/s*g/cc). The results are then transformed into the Lame parameter. The Lame parameter is an elastic parameter consisting of Lambda-Rho and Mu-Rho. Each of these parameters explains the fluid incompressibility and rock stiffness. The results showed that the reservoir distribution had an North West-South East orientation.

Abstrak :
A detailed combined geological and geophysical study in North Sumatra basin has shown that prospective formations for shale play containing gas sweet spots are found to be shales from Bampo, Belumai, and Baong Formations. Bampo Formations Exhibits low shale gas potential with very low to medium in organic material contents, maturity index of immature to mature, and moderate brittleness. Rocks within the formation tent to be reactive to highly reactive to water, with a moderate degree of swelling capacity. Porosity varies within 5.8-7.4% with permeability raging from 0.37 to 3.2 mD. Sweet spots in the formation found around Basilam-l and Securai-l wells occupy about 21% of the formation. On the other hand, Belumai Formation shows moderate to good shale gas potential, with low to high organic material contents, immature to mature levels of maturity, and moderately brittle to brittle. Sweet spots areas in the formation fpund around the two wells are about 29% of the formation. For Baong Formation, analysis reveals moderate to good shale gas potential, with low to medium contents of organic material, immature to mature in maturity index, moderately brittle to brittle in brittleness, and tendency of being reactive to highly reactive to water but with low degree of swelling capacity. Sweet spots in the formation found around two wells occupies are roughly 11% of the total formation volume in the area. Basin modeling leading to gas resources estimation for Baong, Belumai, and Bampo Formations has led to estimated volumes of 6, 379 TCF, 16, 994 TCF, and 25,024 TCF, respectively, with a total amount of 48, 397 TCF. The resources figures are speculative in nature and do not incorporate any certainty and efficiency factors.