Abstract. It has been conducted a geo-electrical resistivity survey at geothermal area of Ie Jue, Aceh Besar. The survey aims to measure resistivity value in the area. It is expected that the values of resistivity will image the subsurface structure in the area. In addition geological features in the area are shown after we process it. The data acquisition in this study was acquired using a SuperSting R8/IP resistivitymeter and its data processing using EarthImager 2D software to get the image of resistivity pseudosection. The two lines of measurement crossed the surface geothermal manifestation. Each line has 330 m in length, and 56 electrodes with electrode space of 6 m. The result of resistivity pseudosection model interpreted based on geological condition and observation in the area. Resistivity pseudosection model shows the study is water-saturated (<64.0 Ωm) to a depth of ±65 m and a highly conductive zone (0.6-3.5 Ωm) with a thickness of 30-50 m. This conductive layers below the embodied surface at a distance of 158-160 m on the IJ-Y1 line and at a range of 130-185 m on the IJ-Y2 line. This conductive zone is indicated as a weak zone where geothermal fluids are transported to the surface.
Groundwater availability is the main concern in a developing region such as Weh Island, Aceh. To locate groundwater resources, vertical electrical sounding (VES) was used to identify subsurface profiles. The study area is located on a volcanic island. The lithology consists of volcanic rocks as andesite lava and pyroclastic rocks as lapily-tuff until breccia. VES method was carried out in 4 measurement points using the Schlumberger array. The resistivity value used to identify subsurface lithology. The top layer of alluvium and weathered lava have resistivity ranges from 14.3 Ωm to 17.7 Ωm with thickness varies from 0 m – 17.4 m. It is followed by andesite resistivity ranges from 17.3 Ωm to 18.2 Ωm with averages thickness is 17.4 m – 35.2 m. Finally, the bottom layer is filled by breccia-tuff with resistivity value from 5.5 Ωm to 7.3 Ωm. The physical properties of some related rocks allow water accumulation to their bodies. The current polarization indicates water content in the pore space of breecia at the study area which polarization point is identified as the water table.
Penyelenggaraan Olimpide Sains Nasional (OSN) pada setiap tahun harus berlangsung dengan sebaik-baiknya mulai dari tingkat sekolah, kabupaten, provinsi hingga nasional membutuhkan persiapan yang terencana dengan baik agar siswa di SMAN 1 Muara Batu dapat berprestasi pada ajang olimpiade bidang kebumian. Berbeda dengan bidang-bidang olimpiade lain seperti matematika, kimia, fisika, dan lainnya yang ada diajarkan oleh guru mata pelajaran disekolah, sedangkan kebumian tidak ada mata pelajarannya sehingga tidak ada guru atau pengajar professional dari sekolah. Atas dasar permasalahan tersebut dilaksanakan pendampingan persiapan OSN bidang ilmu kebumian untuk meningkatkan kompetensi siswa di SMAN 1 Muara Batu sehingga siswa dapat berprestasi pada OSN tingkat Kabupaten. Pendampingan dilakukan dengan memberikan penguatan materi mengenai ilmu kebumian dan bimbingan soal-soal olimpiade kebumian secara umum. Sedangkan peningkatan keterampilan dilakukan dengan praktikum lapangan serta melakukan evaluasi untuk mengetahui kemampuan siswa menyelesaikan soal-soal OSN. Pemahaman konsep awal dan akhir yang dimiliki oleh siswa dilakukan dengan memberikan pretest dan posttest berupa soal-soal OSN secara umum. Siswa dapat menjawab pretest dengan benar hanya 30-40, sedangkan postest siswa dapat menjawab soal 80-90 dari 100 soal. Hasil tersebut menunjukkan adanya peningkatan pemahaman dan kompetensi siswa. Bukti peningkatan kompetensi lainnya dari pendampingan persiapan OSN Kebumian di SMAN 1 Muara Batu yaitu 2 dari 4 siswa telah lulus seleksi OSN tingkat Kabupaten ke tingkat Provinsi tahun 2023
Seulawah Agam is one of the volcanic areas in Aceh province, Indonesia, which planned for a powerplant constriction with an energy capacity expected to be approximately 230 MWe. This volcano has seven manifestations in the form of craters, hot water, and heated soil. The hydrothermal system in this volcano is controlled by a fault system which acts as a medium for the entry and exit of fluids. Therefore, understanding the local geology is required for geothermal power plant development, especially for the determination area for injection and production wells. In this research, we use the Very Low-Frequency Electromagnetic (VLF-EM) methods combined with electrical resistivity tomography data on the Ie Jue manifestation area to determine the shallow structure related to the manifestation. The VLF was made for 4 profiles with 700 m length for each VLF-EM profile and 300 m for electrical resistivity lines. We utilized the Karous Hjelt filter for qualitative interpretation, while Occam's algorithm was applied for 2D inversion of data for quantitative analysis of VLF-EM data. Based on the current density model, several vertical conductive anomalies can be well demonstrated at a distance of 300-400 m from the four VLF profiles. The conductive anomaly can also be seen in the resistivity data from the electrical resistivity. The results of the Occam model show that the depth of faults and fractures is seen at 30 m depth with low resistivity (below 100 Ωm). This anomaly is generally associated with outcrops in the field, such as fumarole and warm ground on the east side of the manifestation area. In addition, the 2D inversion model of VLF also shows the contrast of several fracture zones as a place for fluid to enter and exit the Seulawah volcano. Therefore, based on our result, it can be summed up that this method is effectively applied to geothermal in high terrain areas such as in Indonesia and can be used to suggest safe locations for injection wells and production of geothermal drilling.
Hydrocarbon prospect area research has been done in North Aceh at two locations. The research aims to analyze subsurface litology using resistivity method. Data acquisition of each location was presented by 330 m line survey. The acquisition process was generated by Super Sting R8/IP and modelled by EarthImager 2D. Oil and gas (NA1) resistivity section showed anomaly at 170 m (x) and 17 m (z) that was identified as minor fault. However, oil seepage was not founded on the location. Fossil locality (NA2) section showed a contrast vertical anomaly (16-90 Ωm) around 90 – 120 m that was identified as a way for the seepage.
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