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"ABSTRAKTelah dilakukan penelitian delineasi subcekungan sedimen di cekungan Sengkang yang terletak di lengan bagian selatan Sulawesi. Delineasi subcekungan ini menggunakan kombinasi metode gaya berat dan magnetik, dimana cakupan data magnetik terbatas hanya didaerah Sengkang, sedangkan gaya berat tersebar diseluruh lengan bagian selatan Sulawesi. Berdasarkan analisis horizontal derivative dan second vertical derivative terhadap data gaya berat dan magnetik, subcekungan yang terbentuk dikontrol oleh patahan-patahan di lengan bagian selatan Sulawesi, terutama oleh patahan Walanae. Hasil analisis spektrum menunjukkan kedalaman rata-rata residual adalah 2 km dan kedalaman rata-rata regional sebesar 5,8 km. Hasil dari analisis horizontal derivative dan second vertical derivative yang di overlay dengan citra anomali residual dari gaya berat, dimana batuan dengan densitas tinggi seperti batuan ultrabasa, metamorf dan volkanik menjadi batas masing-masing subcekungan, sehingga terbentuk 8 subcekungan yaitu subcekungan A, subcekungan B, subcekungan C, subcekungan D, subcekungan E dan subcekungan F, subcekungan G dan subcekungan H. Batuan penyusun subcekungan ini diisi oleh batuan sedimen dari formasi Walanae yang dicirikan dengan densitas rendah dan anomali gaya berat yang rendah pula.

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ABSTRACTThe delineation of sub basin has conducted at Sengkang basin that located in the southern part of Sulawesi arm. The delineation of sub basin using a combination of gravity and magnetic methods, where the magnetic data is limited, coverage only Sengkang area, while gravity station are scattered throughout the southern part of Sulawesi arm. Based on analysis of horizontal derivative and second vertical derivative of the magnetic and gravity data, sub basins formerd controlled by faults in the southern arm of Sulawesi, mainly by Walanae fault. The results of the spectrum analysis shows the average depth of residual is 2 km and the depth of the regional is 5.8 km. The results analysis of the horizontal derivatives and the second vertical derivative that are overlaid with the anomalies residual of gravity, where rocks with high density like ultramafics, metamorphic and volcanic be the edge for each sub basin, and there are 8 sub basin namely by sub basin A, sub basin B, sub basin C, sub basin D, sub basin E, sub basin F, sub basin G and sub basin H. Sub basin are filled by sedimentary rocks from Walanae formation that characterized by low density and low gravity anomaly."

"ABSTRAKLapangan DELTA merupakan lapangan dominasi uap di Provinsi Jawa Barat yang saat ini memiliki kapasitas terpasang sebesar 273 MWe. Sebagian besar sumur produksi berada di tengah area reservoir, diperlukan pemboran step-out well ke area reservoir boundary guna menghindari intervensi antar sumur. Sumur step-out well pertama di bor kearah barat daya pada tahun 2011, mengacu pada konseptual model yang didasari model MT 3D hasil inversi tahun 2004. Hasil pemboran sumur tersebut menunjukan bahwa area target berada diluar reservoir dan sumur tersebut tidak berproduksi. Setelah evaluasi, didapatkan bahwa model 3D MT yang saat itu digunakan sebagai acuan tidak menunjukkan kesesuaian dengan data sumur step-out well. Pada penelitian ini, penulis akan melakukan delineasi reservoir boundary dengan pendekatan metoda remodeling inversi 3D terhadap data MT tahun 2004. Hasil inversi 3D MT yang baru setelah dikombinasikan dengan beberapa data pendukung seperti data MEQ, gravitasi, peta geologi, data geokimia dan data sumur. Diperoleh bahwa Model 3D MT baru lebih sesuai dengan kondisi bawah permukaan. Beberapa data pendukung tersebut, penulis gunakan sebagai tambahan informasi untuk interpretasi terpadu. Seluruh tahapan kegiatan ini pada akhirnya mampu mendelineasi ulang reservoir boundary dan penulis dapat merekomendasikan area target pemboran. Hasil penelitian ini diharapkan dapat meningkatkan keberhasilan pemboran sumur step-out wells berikutnya.

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ABSTRACTThe DELTA geothermal field is a vapor dominated system in West Java Province of Indonesia which is currently has 273Mwe installed capacity. The majority of production wells are located in the center of reservoir, need to have step out wells to reduce the well intervention risk. The first step out well targetted SW area on 2011, refer to conceptual model based on 3D MT model of 2004. The well cannot produce steam and indicated as area outside the reservoir. After evaluating the result, it found the 3D MT model does not match with the step out well. On this study, the author will delineate the reservoir boundary with MT 3D remodeling applied to the MT data on 2004. The result of new 3D MT model combined with supporting data sets such as MEQ, gravity, geology map, geochemistry data and well data. The new model showed better match to the subsurface condition. The supporting data sets were utilized for conducting comprehensive interpretation. The study activity was successfully able to delineate reservoir boundary and author was able to give recommendation on areas for well targeting zone. This result is expected to be able to increase the drilling success ratio for the further drilling step out wells."

"Penetapan dan penegasan batas desa perlu dilakukan untuk mewujudkan data batas desa yang definitif. Metode yang digunakan sebagai upaya percepatan penetapan dan penegasan batas desa adalah delineasi secara kartometerik. Proses penetapan dan penegasan batas desa akan mengubah bentuk garis batas dan luas wilayah desa. Perubahan luas wilayah desa juga akan merubah besaran dana desa dikarenakan luas wilayah merupakan salah satu parameter perhitungan dana desa. Tujuan dari penelitian ini adalah untuk melakukan analisis dan sintesa pengaruh penetapan dan penegasan batas terhadap luas wilayah dan sejauh mana pengaruhnya terhadap perubahan besaran dana desa. Metode yang digunakan adalah metode kuantitatif menggunakan pendekatan GIS dan statistik. Data yang digunakan berupa batas desa sebelum dan sesudah delineasi, jumlah penduduk, jumlah penduduk miskin, luas wilayah dan Indek kesulitan geografis. Perubahan luas wilayah didapatkan dari perbandingan luas wilayah desa sebelum dan sesudah delineasi. Selanjutnya dilakukan perhitungan dana desa menggunakan luas desa sesudah dan sebelum delineasi untuk kemudian dilakukan analisis secara statistik. Hasilnya batas desa berpengaruh sekitar 40-42% terhadap perhitungan dana desa dan ketika terjadi perubahan batas desa sekitar 99,6 % dana desanya juga ikut berubah

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Determination and affirmation of village boundaries required to realize definitive village boundary data. The method used as an effort to accelerate the determination and affirmation of village boundaries is cartometric delineation. The process of determining and affirming village boundaries will change the shape of the boundaries and area of ​​the village. Changes in the area of ​​​​the village area will also change the amount of village funds because the area is one of the parameters for calculating village funds. The purpose of this study is to analyze and synthesize the effect of determination and affirming boundaries on the area and the extent of their influence on changes in the amount of village funds. The method used is a quantitative method using a GIS approach and statistics. The data used in the form of village boundaries before and after delineation, population, number of poor people, area and geographic difficulty index. Changes in area are obtained from the comparison of the area of ​​the village before and after delineation. Furthermore, village funds were calculated using the village area after and before delineation for later statistical analysis. As a result, village boundaries affect about 40-42% of the calculation of village funds and when there is a change in village boundaries, about 99.6% of village funds also change."

"Telah dilakukan penelitian guna mendelineasi sistem panas bumi lapangan geothermal ldquo;H rdquo;. Penelitian ini menggunakan metode remote sensing untuk memetakan struktur dan alterasi di permukaan. Analisis geokimia digunakan untuk mengetahui karakteristik sistem panas bumi dan analisis geofisika digunakan untuk memetakan kondisi sistem panas bumi di bawah permukaan. Berdasarkan analisis remote sensing dengan teknik band combination secara pengamatan manual menunjukkan bahwa arah utama dari kelurusan - kelurusan yang berkembang di daerah penelitian ldquo;H rdquo; adalah Barat Laut - Tenggara dan Barat Daya - Timur Laut sesuai dengan Peta Geologi Regional yang berkorelasi dengan kemunculan beberapa manifestasi. Analisis remote sensing juga menemukan 1 lokasi yang diduga merupakan alterasi di permukaan. Analisis data geokimia dilakukan terhadap 12 manifestasi menunjukkan bahwa mata air panas SL-1, SL-2, SLM-1, SLM-2, HTS-1, HTS-2, HTS-3, TBK, TLH-1, TLH -2, TLH-3 dan TLH- 4 merupakan manifestasi tipe outflow. Berdasarkan diagram segitiga ternary Na - K - Mg, diagram Na-K/Mg-Ca, diagram Enthalpy - Chloride Mixing Model, geothermometer Na/K menunjukkan temperatur reservoar adalah sekitar 210 C - 240 C dan dapat dikategorikan ke dalam sistem geothermal moderate to high temperature. Analisis Inversi 3-D Data MT menggunakan 66 data titik ukur. Berdasarkan inversi 3-D Data MT diketahui bahwa lapisan clay cap dengan nilai resistivitas rendah le; 10 ?m tersebar di Selatan dengan ketebalan 500 meter hingga 1000 meter. Lapisan reservoar terletak di bawah clay cap dengan nilai resistivitas >10 - 65 ?m. Base of Conductor BOC diperkirakan berada pada kedalaman 700 meter dengan updome berada di antara Sesar Wairutung dan Sesar Banda. Berdasarkan peta BOC diperoleh luas area prospek geothermal sekitar 16.5 km2.

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The study of ldquo H rdquo geothermal field has been conducted to delineate their geothermal system. This study uses remote sensing method for mapping structure and alteration on the surface. Geochemical analysis is used to determine the characteristics of geothermal system and geophysical analysis is used to interpret the condition of geothermal system of sub surface. Based on remote sensing analysis using band combination technique with manual observation indicates that the main direction of the developed lineaments in the research area H is Northwest Southeast and Southwest Northeast in accordance with Regional Geological Map correlated with the appearance of several manifestations. The remote sensing analysis also found 1 suspected alteration site on the surface. Analysis of geochemical data was performed on 12 manifestations shows that hot springs SL 1, SL 2, SLM 1, SLM 2, HTS 1, HTS 2, HTS 3, TBK, TLH 1, TLH 2, TLH 3 and TLH 4 are outflow manifestations type.

Based on the diagram of the ternary triangle Na K Mg, Na K Mg Ca diagram, Enthalpy Chloride Mixing Model diagram, Na K geothermometer estimates the reservoir temperature is about 210 C 240 C and can be categorized into the moderate to high temperature geothermal system. Analysis of inversion 3 D MT data using 66 data points measurement. Based on 3 D inversion MT data is known that clay cap layer with low resistivity value le 10 m spread in South with thickness 500 meter to 1000 meter. The reservoir layer is located under clay cap with resistivity value 10 m 65 m. Base of Conductor BOC is estimated to be at depth of 700 meters with an updome located around Wairutung Fault Banda Fault. Based on BOC, the prospectable area of geothermal system is about 16.5 km2."

"Penentuan prospek zona permeabilitas sekuder ditentukan melalui analisis terpadu pengideraan jauh, data geologi, magnetotellurik dan gravitasi. Berdasarkan analisis penginderaan jauh, kelurusan yang berkembang berarah dominan Baratlaut-Tenggara dan Timurlaut-Baratdaya dengan kerapatan 2.5-3.2 km/km2, berkorelasi dengan kemunculan manifestasi dan alterasi yang berkembang didaerah penelitian. Perkiraan zona alterasi dan manifestasi menggunakana Metoda Direct Principal Component DPC pada citra Landsat 7 ETM menghasilkan area terduga seluas 73 km2 dari 160 km2 luasan area penelitian yang terkonfirmasi berdasarkan peta sebaran alterasi dan manifestasi yang berada didalam area terduga. Berdasarkan pemodelan inversi 3D MT dan forward modelling 2D data gravitasi, lapisan claycap bernilai resistivitas < 10 ?m dengan densitas 1.7-1.9 gr/cc merupakan alterasi argilik pada formasi Aimere dan Siutoro. Top of Reservoir TOR ditandai dengan keberadaan alterasi propilitik pada sumur MT-02 berada pada kisaran kedalaman 400-600 mdpl dengan ketebalan reservoar berkisar 800-1000 m dengan nilai resistivitas 10-100 ?m dan densitas 2.1-2.6 gr/cc yang diperkirakan berada pada formasi volkanik tua. Heatsource diperkirakan merupakan tubuh intrusi formasi Bajawa dibagian Timurlaut dan pluton formasi kompleks kerucut breksi volkanik dibagian Baratdaya dengan nilai resistivitas >150 ?m dan densitas 2.7-3.1 gr/cc. Manifestasi berupa mataair panas ML1 dan ML2, fumarol dan kolam lumpur panas diperkirakan merupakan upflow dari sistem geotermal berasosiasi dengan Tinggian Volkanik dengan karakter Fluida 2 Fasa yang berada diatas heatsource dibagian Timurlaut. Perkiraan temperatur reservoar berkisar 200-300°C berdasarkan profil temperatur sumur MT-02 dan geotermometer gas. Delineasi daerah prospek reservoar ditentukan seluas 1.6 km2 berdasarkan hasil depth slice elevasi 400m pemodelan inversi 3D MT. Rekomendasi sumur pemboran trajectory menargetkan sesar F08 Sesar Waeluja mengacu kepada hasil analisis curve splitting, FHD, SVD yang mengkonfirmasi keberadaan struktur bawah permukaan diperkirakan merupakan prospek zona permeabilitas sekuder dengan temperatur dan permeabilitas tinggi.

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Prospect identification of secondary permeability zone determined by using integrated analysis of remote sensing, geological, magnetotelluric and gravity data. Lineament pattern characterized the geological structural development dominates on NW SE and SW NE direction with lineament density reach 2.5-3.2 km km2 correlates with the appearance of surface manifestation and alteration zone within research area. Prediction of alteration and manifestation by using Direct Principal Component DPC technique from Landsat 7 ETM image resulting predicted area of 73 km2 out of 160 km2 research area and confirmed by comparing with the alteration and manifestation map from the previous research. 3D MT inversion model and 2D forward modelling gravity resulting geophysical characterization of the geothermal system. Claycap characterize as resistivity value 10 m with density 1.7 1.9 gr cc refer to Aimere and Siutoro argillic altered formation. Top of Reservoar TOR identifies in comparison with log description MT 02 well with the appearance of prophylitic alteration found at elevation of depth 400-600 msl with thickness of reservoir 800 1000m below characterized as resistivity value 10 100 m with density 2.1-2.6 gr cc interpreted as old volcanic formation. Heatsource interpreted as intrusive body of Bajawa formation found on the Northeastern part while at the Southwestern part related with the pluton of the breccia volcanic cone complex with the resistivity value 150 m and the density value 2.7 3.1 gr cc. Surface manifestation lies above the heatsource at Northeastern identified as the upflow zone of the typical Volcanic Associated Geothermal System on High Terrain with the 2 Phase Fluid characteristic. Reservoir temperature predicted 200-300°C based on temperature profile from well MT 02 and gas geothermometer. Delineation of the reservoir prospect area determined 1.6 km2 wide based on depth slice of 3D MT inversion at elevation 400 msl. Recommended trajectory drilling well, targeting F08 fault Waeluja Fault based on the result of confirmation of the occurrence subsurface geological structure using curve splitting, FHD, SVD predicted as the prospect of secondary high permeability zone and high temperature."