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All Journal Buletin Sumber Daya Geologi Journal of Geosciences and Applied Geology
Dudi Hermawan
Pusat Sumber Daya Mineral, Batubara dan Panas Bumi
Earth & Planetary Sciences Education Energy Engineering Environmental Science

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KEPROSPEKAN PANAS BUMI GUNUNG LAWU BERDASARKAN KAJIAN VULKANOSTRATIGRAFI Dudi Hermawan; Lano Adhitya Permana
Buletin Sumber Daya Geologi Vol. 13 No. 3 (2018): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2544.736 KB) | DOI: 10.47599/bsdg.v13i3.232

Abstract

Gunung Lawu merupakan salah satu kerucut gunungapi di Indonesia yang memiliki keterdapatan manifestasi panas bumi dengan sebaran cukup luas di bagian lerengnya. Untuk mengetahui keprospekan panas bumi daerah Gunung Lawu diperlukan suatu kajian ilmiah yang bisa menjelaskan hubungan antara vulkanisme Gunung Lawu dengan pembentukan sistem panas bumi daerah tersebut. Metode penelitian dalam makalah ini adalah berupa kajian vulkanostratigrafi. Kajian dilakukan dengan menentukan parameter-parameter karakteristik vulkanik Gunung Lawu yang meliputi volume dan pola struktur geologi sebagai data primer, serta umur vulkanisme dan evolusi magma sebagai data sekunder. Hasil kajian menunjukkan bahwa Gunung Lawu memiliki volume gunungapi sebesar 300 km3 yang mengindikasikan keberadaan dapur magma yang cukup besar sebagai sumber panas, dengan vulkanisme termuda berumur 200 ribu tahun yang berada di kisaran umur ideal untuk membentuk sistem panas bumi yang matang. Pola struktur geologi menunjukkan arah struktur yang homogen dengan penyebaran vent radial mengarah ke puncak Gunung Lawu. Intensitas kerapatan patahan dan rekahan tinggi yang mencerminkan adanya zona permeabilitas tinggi terletak di lereng selatan dan barat Gunung Lawu. Dengan karakteristik tersebut, dapat disimpulkan bahwa daerah panas bumi Gunung Lawu memiliki prospek panas bumi yang menarik untuk dikembangkan dan perlu diteliti lebih lanjut, terutama pada lereng selatan dan barat Gunung Lawu.
KARAKTERISTIK MINERAL LEMPUNG HASIL UBAHAN PADA SUMUR LW-1 DAN LW-2 DENGAN MENGGUNAKAN METODE DIFRAKSI SINAR-X PADA SISTEM PANAS BUMI GUNUNG LAWU: THE CHARACTERISTICS OF CLAY MINERAL ALTERATION FROM WELLS LW-1 AND LW-2 USING X-RAY DIFFRACTION METHOD IN THE MOUNT LAWU GEOTHERMAL SYSTEM Lano Adhitya Permana, S.T., M.T; Candra Widya Sastrawijaya; Dudi Hermawan
Buletin Sumber Daya Geologi Vol. 15 No. 1 (2020): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1677.267 KB) | DOI: 10.47599/bsdg.v15i1.293

Abstract

The LW-1 and LW-2 geothermal wells are located in the depression zone between Mount Lawu and Mount Jabolorangan contain rocks that are hydrothermally alterated as indicated by the presence of alteration minerals that are classified as argillic to advanced argillic alteration. To determine the character of the altered minerals that were formed, especially the presence of clay minerals in LW-1 and LW-2 wells, a study of clay minerals is required using the X-Ray Diffraction approach. This study aims to determine the presence and characteristics of clay minerals in LW-1 and LW-2 also their correlation to the formation of a geothermal system in the Gunung Lawu area. The analysis and interpretation using XRD method in LW-1 and LW-2 wells shows that within the temperature increases the crystal shape of the clay minerals becomes more perfect which is represented by a smaller degree of crystallinity. Whereas the effect of grain size on the XRD pattern shows that the crystallinity of the clay minerals tend to decrease with increasing grain size. The altered clay minerals in LW-1 and LW-2 wells consist of smectite, illite, kaolinite and halloysite which can be acted as caprock in the Mount Lawu geothermal system.
CHARACTERISTICS OF MINERAL ALTERATION ZONES IN KADIDIA GEOTHERMAL FIELD, SIGI DISTRICT, CENTRAL SULAWESI PROVINCE Danella Rachmatika; Agus Didit Haryanto; Johanes Hutabarat; Dudi Hermawan; Santia Ardi Mustofa
Journal of Geological Sciences and Applied Geology Vol 3, No 2 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i2.22459

Abstract

Kadidia geothermal area is located in Sigi Regency, Central Sulawesi Province. The survey area is about 57.1 km from the city of Palu and about 41.9 km from the capital city of Sigi Regency, Sigi Biromaru. The purpose of this research is to determine the characteristics of hydrothermal alteration in the research well. The method used is petrological analysis on KDD-1 well core data starting from the depth of 44,3 m – 703,85 m, petrographic analysis on 17 rock samples and Specterra analysis based on secondary data. The alteration minerals that appeared in research wells include chlorite, calcite, sericite, secondary quartz, iron oxide, opaque minerals and clay minerals with alteration types in the form of replacement and direct depositional. Based on the presence of minerals and determination of alteration zones, obtained Chlorite-Calcite-Illite-Smectite zone, which is characterized by the presence of chlorite, calcite, smectite, sericite alteration minerals at a depth of ± 12.7 m to ± 599 m. At depth of ± 599 to ± 703 m, alteration minerals that appear include chlorite, calcite, illite-smectite which are more dominant. Furthermore, it also found the presence of secondary quartz minerals that fill vugs, sericite and iron oxides with a rare intensity. This zone includes in the argillic zone with a temperature of 140°C - 220°C. It was concluded that the alteration rocks in KDD-1 wells are estimated as caprock zones of the Geothermal Kadidia system, which are formed because of the interaction between rocks and acidic fluid to low acid.
Co-Authors Agus Didit Haryanto Candra Widya Sastrawijaya Danella Rachmatika Johanes Hutabarat Lano Adhitya Permana Lano Adhitya Permana, S.T., M.T Santia Ardi Mustofa