Studi Sifat Termal Batuan Daerah Lapangan Panas Bumi Way Ratai Berdasarkan Pengukuran Metode Konduktivitas Termal

Abstract

ABSTRAKTelah dilakukan penelitian pada daerah lapangan panas bumi Way Ratai dengan pengukuran metode konduktivitas termal. Data konduktivitas termal digunakan untuk memetakan persebaran batuan menghantarkan panas secara konduksi dalam sistem panas bumi. Hasil data pengukuran dengan metode konduktivitas termal pada daerah lapangan panas bumi Way Ratai berupa data k (konduktivitas), Rt (resistivitas termal), dan T (suhu). Nilai data konduktivitas yang terukur di lapangan panas bumi tersebut berkisar 0.056-0.664 W/mK, nilai data resistivitas termal yang terukur berkisar 1.344-17.527 mK/W, dan nilai suhu yang terukur berkisar 22.68-52.59°C. Tinggi rendahnya nilai konduktivitas termal batuan dipengaruhi oleh beberapa faktor, yaitu struktur geologi yang ada di lapangan seperti sesar normal dan kelurusan-kelurusan (lineaments), keberadaan alterasi, serta manifestasi air panas atau tempat keluarnya uap panas dari fumarol. ABSTRACTResearch on Way Ratai geothermal field has been done by measuring the thermal conductivity method. The thermal conductivity data is used to generate a map of the dispersion of heat conductively conductive rocks in the geothermal system. The result of measurement by thermal conductivity method in Way Ratai geothermal field is data of k (conductivity), Rt (thermal resistivity), and T (temperature). The value of the measured conductivity data in the geothermal field has range between 0.056-0.664 W/mK, the measured thermal resistivity value has range between 1.344-17.527mK/W, and the measured temperature value is between 22.68-52.59°C. The difference value of rock's thermal conductivity is influenced by several factors, which is the existing geological structures in the field such as normal faults and lineaments, the presence of alteration, also the manifestation zone of hot water or hot vapor that caused from fumaroles.

Volcanostratigraphy Study of Way Ratai Geothermal Prospect in Pesawaran Regency, Lampung Province

“…The surface texture shows a coarse texture that indicates the level of erosion is at the mature stage. Compared to the local geological map from [6], the eruption product from Betung Crown is dominated by lava flows. It also has the parasitic cone located in the northeast towards the medial zone of Betung Crown.…”

“…The research area's geological structure is composed of several faults and lineaments that extend northwest-southeast and northeast-southwest [6]. In addition, two craters can be seen on top of Mount Ratai and Mount Betung, also the old caldera feature of Gebang Volcano on the east side of Mount Ratai (Figure 2).…”

“…At this stage, several volcanic parameters of Mount Ratai and Mount Betung need to be known. First, delineation of volcanic products was carried out referring to research conducted by [6]. Then, it is compiled into a geological map of the volcano and its stratigraphic column (Figure 4).…”

“…Each crowns have several flank eruption centers delineated as a hummock unit. The lithological boundaries from each volcanostratigraphy unit are delineated by considering the morphological aspects of volcanic products in the form of lava and pyroclastic and refers to the geological map from [6]. Ratai Crown is located in the middle of the study area, covering about 50% of the whole area.…”

Pengujian Prototipe Instrumen Pengukuran Gradien Termal di Lapangan Panas Bumi Padang Cermin Pesawaran

“…Penelitian ini dilakukan dengan beberapa tahapan yaitu kalibrasi suhu tiap sensor pada prototipe instrumen, pengukuran data di lapangan panas bumi Padang Cermin (Gambar 1) dan terakhir pembuatan peta sebaran dan model distribusi suhu untuk perbandingan dengan hasil pengukuran penelitian sebelumnya [2], [21] menggunakan instrumen thermal conductivity MAE A500T.…”