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.

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Oil shale is a type of shale containing organic material is not yet mature. When heated to a certain temperature, the organic content to mature so that it can produce petroleum. Exploration with a reliable method to energy sources of the future needs to be done, because it has a particularly important role in the context of the national energy supply security in the future.  Oil deposits in shale oil is quite high, estimated as relatively large reserves spread across several regions of Indonesia. To determine the content of oil shale in the basin necessary to evaluate the condition of the reservoir, by determining and analyzing the reservoir parameters. Determination and analysis of reservoir parameters is done by two methods, namely core analysis in the laboratory and log interpretation in the field.   Determination of oil-bearing layer in the wells is performed quantitatively which is based on the value HTTI=14.20-75.30 ´103 cal cm-3)and Ro=0.70-2.17 (%).  Further is qualitatively to determine layer containing shale (oil shale).  First look at the layers of shale from the high GR value and then their separation sonic and resistivity in the shale layer.  A layer of oil shale wells BG-6 is present at a depth of 1637-1687 meters.  BGS-1 wells at a depth of 2025-2062, 2100-2125, 2175-2200, 2275-2310 meters.  BGS-2 wells at a depth of 2025-2045, 2138-2160, 2275-2295, 2380-2405 meters.  BGS-3 wells at a depth of 2150-2165, 2212-2225 meters.  While the BGS-4 wells at a depth of 2175-2187.5, 2212.5-2245, 2300-2312.5, 2350-2388 meters.

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