YUDIANTORO, DWI .FITRI. and SUPARKA, E. and YUWONO, Suyatno and TAKASHIMA, i. (2013) Interstratified Illite/Montmorillonite in Kamojang Geothermal Field, Indonesia Perselingan Ilit/Monmorilonit di Lapangan Geotermal Kamojang, Indonesia. JURNAL GEOLOGI INDONESIS, 8 (4). pp. 177-183. ISSN 1907-2953
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Abstract
Kamojang geothermal field located in West Java Province, falls under the Pangkalan Subregency, Bandung Regency. The researched area is a geothermal field located in the Quaternary volcanic caldera system of about 0.452 to 1.2 Ma. The volcanic activity generated hydrothermal fluids, interacting with rocks producing mineral alteration. The minerals formed in the areas of research are interstratified illite/ montmorillonite (I/M). Analyses to identify interstratified I/M have been performed by X-ray diffraction using ethylene glycol, while the determination of the type and percentage of interstratified I/M was based on the calculation method of Watanabe. The methodology was applied on core and cutting samples from Wells KMJ-8, 9, 11, 13, 16, 23, 49, 51, and 54. The result of analysis of the samples shows that the type of clay is interstratified illite/montmorillonite and the minerals are formed at temperatures ranging from 180 to 220° C. The type of interstratified I/M in the studied area is S = 0 and S = 1. The percentage of illite type S = 0 is between 20 - 35% illite, whereas type S = 1 has about 45 - 72% illite. Along with the increasing depth, the percentage of illite is getting greater. This is consistent with the vertical distribution of temperature which increases according to the depth. This correlation results in an interpretation that the upflow zone of the geothermal reservoir is located in the centre of the Kamojang geothermal field. Keywords: geothermal, Kamojang, fluid, illite, montmorillonite, interstratified AbstrAk Lapangan panas bumi Kamojang yang terletak di Provinsi Jawa Barat, secara administratif termasuk ke dalam Kecamatan Pangkalan, Kabupaten Bandung. Daerah penelitian merupakan lapangan panas bumi yang terletak di kaldera gunung api Kuarter yang berumur sekitar 0,452 sampai 1,2 juta tahun. Hasil kegiatan gunung api ini menghasilkan cairan fluida, yang berinteraksi dengan batuan dan menghasilkan mineral ubahan. Mineral ubahan yang terbentuk di daerah penelitian ini adalah perselingan ilit/monmorilonit (I/M). Analisis untuk mengidentifikasi perselingan I/M telah dilakukan menggunakan difraksi X-ray dengan etilen glikol, sedangkan penentuan tipe dan persentase perselingan I/M didasarkan pada metode kalkulasi Watanabe. Metodologi ini diterapkan pada inti dan percontoh dari sumur KMJ-8, 9, 11, 13, 16, 23, 49, 51, dan 54. Hasil analisis percontoh memperlihatkan bahwa tipe lempungnya adalah perselingan ilit/monmorilonit dan mineral tersebut terbentuk pada temperatur yang berkisar antara 180 - 220 o C. Perselingan tipe I/M di daerah penelitian adalah S=0 dan S=1. Persentase tipe ilit S=0 antara 20 - 35%, sedangkan pada tipe
| Item Type: | Article |
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| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | dwi fitri yudiantoro |
| Date Deposited: | 27 Jul 2017 09:04 |
| Last Modified: | 27 Jul 2017 09:04 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/12489 |
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