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"Untuk menentukan konseptual model dan rekomendasi titik pengeboran pada daerah panasbumi "O", dilakukan penelitian dengan memadukan inversi MT 3-Dimensi, data geologi dan geokimia. Satuan batuan daerah penelitian didominasi batuan lava berumur quarter. Struktur yang muncul berarah NW-SSE berkorelasi dengan kemunculan manifestasi. Diagram Ternary Cl-SO4-HCO3 mengindikasikan manifestasi AP-1 bersifat volcanic waters. Pendugaan temperature reservoir menggunakan geothermometer Na/K bernilai 202 ndash; 219 oC. Berdasarkan manifestasi dan geokimia didapatkan sistem geothermal adalah hydrothermal systems associated with high standing volcanic centers. Area upflow ditunjukkan pada manifestasi AP-1 dan F, sedang manifestasi AP-2, AP-3 dan AP-4 merupakan tipe manifestasi outflow. Analisis geofisika menggunakan 40 titik ukur magnetotellurik dan 213 titik ukur gravitasi. Hasil cross power data MT terdapat 3 titik very good, 36 titik good, dan 1 titik fair. Hasil inversi 3D MT, zona claycap memiliki resitiviti 100 ?m. Berdasarkan perhitungan parasnis data gravitasi, nilai densitas rata-rata 2.46 gr/cc. Konseptual model geothermal didapatkan zona reservoir membentuk updome dengan ketinggian -700 m, zona claycap menutupi reservoir pada kedalaman 500 s.d -1500 di NW dan -2000 m di arah SW. Heat source pada kedalaman -3000 s.d >-4000 m. Prospek panasbumi didasarkan pada base of conductor diperoleh luas 7.5 km2. Rekomendasi 2 titik pengeboran tepat di updome reservoir, sumur O-1 dibor tegak lurus dan sumur O-2 ke arah NW.

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To determine the conceptual models and drilling recommendations in the geothermal area O , research by combining 3 D MT inversion, geochemical and geological data. Area of research are dominated by lithologies of lava rocks quarter. Appears of manifestations correlation with structure NW SSE. Ternary diagram Cl SO4 HCO3 indicates manifestation AP 1 is volcanic waters. Prediction of reservoir temperature using Geothermometer Na K has 202 219 oC. Based on the obtained geochemical manifestations the geothermal systems are hydrothermal systems associated with high standing of volcanic centers. Upflow area shown on the manifestation of AP 1 and F, were manifestations of AP 2, AP 3 and AP 4 is a type of outflow. Geophysical analysis using magnetotelluric measuring 40 points and 213 points of gravity.

The results of cross power of data MT 3D had 3 points are very good, 36 point good, and one fair point. 3D MT inversion results, claycap zone has resitivity 100 m. Based on the calculation parasnis gravity data, the average density values 2.46 gr cc. The conceptual model of the geothermal reservoir zone formed updome obtained with a height of 700 m, claycap zone covering the reservoir at a depth of 500 until 1500 in NW and 2000 m in direction SW. Heat source at the depth of 3000 s.d 4000 m. Geothermal prospects based on base of conductor are obtained 7.5 km2. Two point of drilling recommendation on top of updome reservoir, wells O 1 drill vertical and O 2 towards to NW."

"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. ......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."