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Abstrak :
The purpose of this research is to find out the characteristics of reservoir parameter and to estimate the pressure of geothermal field. The annealing simulation methods is a conditional simulation that has some advantages, is able to avoid local optimal value mistakes and can be used in data extrapolition. The result of the annealing simulation on the geothermal field are image, contour, and semivariogram of parameter resevior. There are two conclusions gained from this research. Annealing simulation methods gives are two an image of reservoir with limited data and is valid to be used in parameters prediction of reservoir at the Kamojang geothermal field with significance 5% and the optimum pressure of geothermal is 31.85 ksc with location (-22248m.1663.6m)

Abstrak :
ABSTRAK
Telah dilakukan penelitian guna mendelineasi karakteristik dan geometri reservoar pada lapangan geothermal ?A? berdasarkan interpretasi data 3G. Penelitian ini menggunakan metode remote sensing untuk memetakan struktur dan alterasi di permukaaan. Analisis geokimia digunakan untuk mengetahui karakteristik sistem geothermal dan analisis geofisika digunakan untuk memetakan kondisi sistem geothermal di bawah permukaan. Berdasarkan analisis remote sensing dengan menggunakan teknik band combination secara pengamatan manual diketahui bahwa arah utama dari kelurusan-kelurusan yang berkembang di daerah penelitian A adalah Barat laut-Tenggara. Kelurusan ini berkorelasi dengan kemunculan manifestasi permukaan. Analisis remote sensing juga menemukan 4 lokasi yang diduga terdapat alterasi di permukaan. Analisis data geokimia menunjukkan bahwa manifestasi SE dan KB merupakan manifestasi tipe upflow dan manifestasi yang muncul di BB, SU, TR dan SJ merupakan tipe manifestasi outflow. Geothermometer gas menunjukkan temperatur reservoar adalah sekitar 250 °C. Analisis data geofisika menggunakan 37 data titik ukur magnetotellurik dan 286 titik ukur gravitasi. Berdasarkan inversi 3D data MT dan pemodelan gravitasi, diketahui bahwa lapisan clay cap dengan nilai resistivitas rendah (≤ 10 Ωm) dan densitas 2,3 gr/cc tersebar di sekitar manifestasi SE mulai di dekat permukaan dan melebar ke arah MAP BB dengan ketebalan 1500 meter sampai 2000 meter. Batuan clay cap diduga terdiri dari satuan batuan Lava KB Muda yang mengalami alterasi hidrothermal. Lapisan reservoar terletak di bawah clay cap dengan nilai resistivitas >10 ? 65 Ωm dan densitas 2,4 gr/cc yang diduga merupakan satuan batuan KB Tua 2. Base of Conductor (BOC) diperkirakan berada pada kedalaman 1500 m dengan updome berada di bawah manifestasi SE. Luas area prospek pada lapangan geothermal A berdasarkan peta BOC adalah sekitar 18 km2.

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ABSTRACT
The research had been conducted to delineate characteristic and reservoir geometry in ?A? geothermal field based on 3G data interpretation. This research used remote sensing method to map the structure and alteration on the surface. Geochemical and geophysical analysis are used to identify the geothermal system characteristic and map geothermal system condition in the subsurface. Based on the remote sensing analysis by using band combination in manual observation, the main direction of lineaments developed in area ?A? is North West-South East. This lineaments is corelated to the appearance of surface manifestation. The remote sensing analysis also found four locations which are inferred as alteration on the surface. The geochemical data analysis shows that SE and KB manifestations are the upflow type manifestation and manifestations which appear in BB, SU, TR, and SJ are the outflow type manifestations. Gas geothermometer shows that the reservoir temperature is about 250 °C. The analysis of geophysics data uses 37 magnetotelluric points and 286 gravity points. Based on 3D inversion and gravity modelling, it is found that the clay cap layer which has low resistivity value (≤ 10 Ωm) and density 2.3 g/cc scatters around the SE manifestation, from the nearby surface and widen to MAP BB direction with thickness of 1500 meters to 2000 meters. Clay cap rock is interpreted as Lava KB Muda rock which undergoes hydrothermal alteration. Reservoir layer is located underneath clay cap with resistivity value >10 ? 65 Ωm and density 2.4 g/cc which is interpreted as KB Tua 2 rock. Base of Conductor (BOC) is estimated to be within in the depth of 1500 m with the updome is beneath SE manifestation. The prospect area in ?A? geothermal field based on the BOC map is calculated about 18 km2.

Abstrak :
Penyelidikan karakteristik reservoir memiliki peranan penting dalam bidang eksplorasi minyak dan gas bumi (Hydrocarbon). Penyelidikan ini bisa cukup sulit dilakukan dikarenakan oleh beberapa hal, salah satunya adalah memetakan reservoir lapisan tipis yang disebabkan oleh keterbatasan resolusi seismik. Ada banyak metode yang telah diterapkan terhadap data seismik dalam karakteristik reservoir. Dekomposisi spektral telah diaplikasikan untuk interpretasi data seismik 3D. Metode yang digunakan adalah metode Continuous Wavelet Transform (CWT), metode ini diaplikasikan pada data sintetik dan data seismik riil lapangan Bonsville. Aplikasi dari metode CWT pada data sintetik bertujuan untuk mendapatkan frequency slicing dan mengetahui frekuensi tertentu dari masing-masing frekuensi yang digunakan untuk analisa dekomposisi spectral, selanjutnya diaplikasikan pada data riil lapangan Boonsville bertujuan untuk mendapatkan horizon slice. Hasil analisis pada data riil seismik lapangan Boonsville yang didapatkan dari proses dekomposisi spektral menunjukan adanya distribusi channel pada formasi caddo.

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Reservoir characteristic investigation has an important role in hydrocarbon exploration. The investigation cannot be done easily because of several problems, on of them is for mapping the thin beds reservoir which is caused by the limitation of the seismic resolution. Many methods have been applied to seismic data in the reservoir characterization. Spectral decomposition has been applied to 3D seismic data interpretation, such as by using Continuoaus Wavelet Transform (CWT) method. These method are applied to, first synthetic data set and second, real seismic data set collected along Boonsville field. The application of method to the synthetic data set is used to get the best frequency slicing and to know a certain frequency from each frequencies such as by using analysis spectral dekomposition, hereinafter, method are applied to the real data of the boonsville field is get the best horizon slice. The result of analysis on real seismic data set collected along Boonsville Field with spectral decomposition process can show distribusri channel in Caddo Formation.