Geophysics Field Camp (GFC) is a curriculum related project conducted by undergraduate students o... more Geophysics Field Camp (GFC) is a curriculum related project conducted by undergraduate students of the Department of Physics (Geothermal Laboratory), the University of Indonesia. The project is designed to educate the students in understanding a geophysical project from survey design, data acquisition, data processing, through modeling and interpretation. In addition, geological mapping and geochemical survey are also added to support the geophysical data. Mt Pancar geothermal prospect is located in the Bogor district, West Java Province, Indonesia. The geological condition of the area consists of Tertiary volcanic formation of the Mt. Pancar and Quartenary volcanic formation of Mt. Panisan covering Tertiary sedimentary formation. The surface manifestations found in this geothermal area are hot springs, warm grounds and altered rocks. The hot springs are found in Kawah Merah (T = 70C) and Kawah Putih (T = 51C) with neutral pH and minor silica sinter. There is no indication of therma...
Indonesia’s tectonic activity is one of the most active in the world. These conditions make Indon... more Indonesia’s tectonic activity is one of the most active in the world. These conditions make Indonesia prone to earthquakes, tsunamis, and volcanic eruptions. Tsunamis are large ocean waves that are formed through several processes such as underwater earthquakes, underwater landslides, volcanic activity, and asteroid impacts. Indonesia has been hit by various tsunami events. However, not all characteristic tsunami events are well known and recorded. Knowing the characteristics of a tsunami occurrence is very important to understand the frequency and intensity of tsunamis in the present. This research create a WebGIS database for paleotsunami in Indonesia. Tsunami incident data comes from literature related to tsunami events such as books, journals, reports, final projects, and others. Making WebGIS in this study will be developed using website programming, namely HTML, CSS, and JavaScript. The research results obtained 302 tsunami data. The period of tsunami in this research is from ...
a ICS-UNIDO. International Center for Science and High Technology United Nations Industrial Devel... more a ICS-UNIDO. International Center for Science and High Technology United Nations Industrial Development Organization. AREA Science Park Padriciano 99, Bldg. L2 34012 Trieste, Italy. b Università di Trieste, Via Weiss 1 34127 Trieste, Italy. c CNR-IGG. Consiglio Nazionale delle Ricerche – Istituto di Geoscienze e Georisorse. Via G. Moruzzi 1 – 56100 Pisa, Italy. d LaGeo S.A. de C.V.; 15 Avenida Sur, Colonia Utila Nueva San Salvador, La Libertad, El Salvador e Center for Application Of Isotope And Radiation Technology, National Nuclear Energy Agency (BATAN), Indonesia. f Department of Physics, Faculty of Mathematics and Natural Sciences – University of Indonesia. Kampus Baru Depok, 16424, Indonesia.
This paper presents a case study on the subsurface structural imaging of Esh El Mallaha area. Esh... more This paper presents a case study on the subsurface structural imaging of Esh El Mallaha area. Esh EL Mallaha area is located on the western flank of the Gulf of Suez and it has a great importance due to its hydrocarbon resources. In 1994 the area was covered by aeromagnetic survey conducted by Aero Service Division, Western Geophysical Company of America. The main object of this work to delineate the subsurface structural framework of the area that may assist in hydrocarbon exploration. A 3D analytic signal technique was applied to the aeromagnetic data. One of the most advantages of the analytic signal is that it produces a maximum value over a 2D magnetic source and as a result it enables more accurate location of the magnetic sources. It is also straight forward to determine the depth to the magnetic contacts using a simple formula derived from the analytic signal. Generally, Esh EL Mallaha area is characterized by two basinal structures taking the direction of the NW-SE parallel...
ABSTRACT Sibayak geothermal field is located about 65 km to the southwest of Medan in the North S... more ABSTRACT Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Province, Indonesia. Recently, a small-scale geothermal power plant (2 MWe) has been installed in this area. Since electricity demand increases in the North Sumatra Province, Pertamina (Geothermal Division) plans to increase the capacity to 20 MWe in the year 2005. Accordingly, detailed knowledge of the reservoir structure and its extension must be determined. The mise-a-la-masse (MAM) surveys were carried out in this field using the exploration well SBY-1 and the production well SBY-4 to delineate a new production target for further field development. Interpretation of the MAM data was done to correlate the results with formation temperatures and lost circulation zones and finally to image a promising reservoir zone. This interpretation result of MAM data indicates that reservoir zones trends to the north-northeast direction of the study area and shows a good correlation with formation temperature and lost circulation zone. This fact leads us to propose that the best production target for the development of the Sibayak area is characterized by the high temperature, high permeability and high well productivity region marked by the dome-shaped resistivity zone below the conductive cap rocks.
Memoirs of the Faculty of Engineering. Kyushu University, 2006
Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Pr... more Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Province, Indonesia. Starting from 1998, a small-scale geothermal power plant (2 MWe) has been installed in this area. Since electricity demand increases in the North Sumatra Province, Pertamina Geothermal Energy plans to increase the capacity to 20 MWe. Accordingly, detailed knowledge of the reservoir structure and its extension must be determined for a new production target. The mise-a-la-masse (MAM) surveys were carried out in this field using the exploration well SBY-1 and the production well SBY-4 to delineate a new production target for further field development. A conventional one-dimensional MAM data processing has been done to obtain lateral variation of subsurface resistivity. However, the result is not satisfied to image real condition of the geology on the subsurface. Therefore, we carried out an advanced 3-D MAM inversion based on the smoothness-constrained least-squares metho...
DC Resistivity analysis was carried out in the Sibayak geothermal using Schlumberger Vertical Ele... more DC Resistivity analysis was carried out in the Sibayak geothermal using Schlumberger Vertical Electrical Sounding (VES) during a preliminary study in 1990. The resistivity data has been processed conventionally using one-dimensional (1-D) inversion to estimate vertical variation of resistivity related to hydrothermal activity at shallow depths of less than 1 km. Subsequently, the inversion results were correlated to develop a 2-D resistivity section; afterwards, it was combined with the MT data processing result. However, the results of 1-D inversion of DC resistivity are not fully satisfactory for actual 3-D structures such as geothermal systems. Therefore, we have re-processed the same Schlumberger VES data set by performing a 2-D inversion based on ABIC least squares method. The 2-D inversion result shows a more realistic feature in terms of geological structure. Caldera boundaries and a dome-like structure of the low resistivity are clearly determined, indicating an up-flow zone...
Summary Significant improvements in the magnetic survey, design, processing and most important, r... more Summary Significant improvements in the magnetic survey, design, processing and most important, resolution of aeromagnetic data could provide detailed information on the spatial distribution, geometry, and structural style of faults and fracture systems. The magnetic data can easily integrate/merge and correlated with other available data (e.g. gravity, geology, seismic, topography). The integration of these data provides an excellent approach for structural system and evaluation of hydrocarbon plays in Esh El Mellaha area, Gulf of Suez. In this paper, enhancements and filtering of aeromagnetic data were implemented using band-pass filter and horizontal gradient technique. The results are compared with the available information; such as geologic map, drill-hole data, topographic data, and 2D seismic data in the northern part of the area. In general, the area is dissected by a system of faults most of them trending in the NW-SE (Red Sea trend) and NEE-SWW (Tethyan trend). Introduction:
ABSTRACT Repeated gravity measurements have been applied at the Kamojang geothermal field in Indo... more ABSTRACT Repeated gravity measurements have been applied at the Kamojang geothermal field in Indonesia. Previously, we used only relative gravimeters to measure precise gravity change. We detected gravity changes caused by the production and ...
ABSTRACT Repeated gravity measurements have been applied at the Kamojang geothermal field in Indo... more ABSTRACT Repeated gravity measurements have been applied at the Kamojang geothermal field in Indonesia. Previously, we used only relative gravimeters to measure precise gravity change. We detected gravity changes caused by the production and ...
Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Pr... more Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Province, Indonesia. Starting from 1998, a small-scale geothermal power plant (2 MWe) has been installed in this area. Since electricity demand increases in the North Sumatra Province, Pertamina Geothermal Energy plans to increase the capacity to 20 MWe. Accordingly, detailed knowledge of the reservoir structure and its extension must be determined for a new production target. The mise-a-la-masse (MAM) surveys were carried out in this field using the exploration well SBY-1 and the production well SBY-4 to delineate a new production target for further field development. A conventional one-dimensional MAM data processing has been done to obtain lateral variation of subsurface resistivity. However, the result is not satisfied to image real condition of the geology on the subsurface. Therefore, we carried out an advanced 3-D MAM inversion based on the smoothness-constrained least-squares metho...
Geophysics Field Camp (GFC) is a curriculum related project conducted by undergraduate students o... more Geophysics Field Camp (GFC) is a curriculum related project conducted by undergraduate students of the Department of Physics (Geothermal Laboratory), the University of Indonesia. The project is designed to educate the students in understanding a geophysical project from survey design, data acquisition, data processing, through modeling and interpretation. In addition, geological mapping and geochemical survey are also added to support the geophysical data. Mt Pancar geothermal prospect is located in the Bogor district, West Java Province, Indonesia. The geological condition of the area consists of Tertiary volcanic formation of the Mt. Pancar and Quartenary volcanic formation of Mt. Panisan covering Tertiary sedimentary formation. The surface manifestations found in this geothermal area are hot springs, warm grounds and altered rocks. The hot springs are found in Kawah Merah (T = 70C) and Kawah Putih (T = 51C) with neutral pH and minor silica sinter. There is no indication of therma...
Indonesia’s tectonic activity is one of the most active in the world. These conditions make Indon... more Indonesia’s tectonic activity is one of the most active in the world. These conditions make Indonesia prone to earthquakes, tsunamis, and volcanic eruptions. Tsunamis are large ocean waves that are formed through several processes such as underwater earthquakes, underwater landslides, volcanic activity, and asteroid impacts. Indonesia has been hit by various tsunami events. However, not all characteristic tsunami events are well known and recorded. Knowing the characteristics of a tsunami occurrence is very important to understand the frequency and intensity of tsunamis in the present. This research create a WebGIS database for paleotsunami in Indonesia. Tsunami incident data comes from literature related to tsunami events such as books, journals, reports, final projects, and others. Making WebGIS in this study will be developed using website programming, namely HTML, CSS, and JavaScript. The research results obtained 302 tsunami data. The period of tsunami in this research is from ...
a ICS-UNIDO. International Center for Science and High Technology United Nations Industrial Devel... more a ICS-UNIDO. International Center for Science and High Technology United Nations Industrial Development Organization. AREA Science Park Padriciano 99, Bldg. L2 34012 Trieste, Italy. b Università di Trieste, Via Weiss 1 34127 Trieste, Italy. c CNR-IGG. Consiglio Nazionale delle Ricerche – Istituto di Geoscienze e Georisorse. Via G. Moruzzi 1 – 56100 Pisa, Italy. d LaGeo S.A. de C.V.; 15 Avenida Sur, Colonia Utila Nueva San Salvador, La Libertad, El Salvador e Center for Application Of Isotope And Radiation Technology, National Nuclear Energy Agency (BATAN), Indonesia. f Department of Physics, Faculty of Mathematics and Natural Sciences – University of Indonesia. Kampus Baru Depok, 16424, Indonesia.
This paper presents a case study on the subsurface structural imaging of Esh El Mallaha area. Esh... more This paper presents a case study on the subsurface structural imaging of Esh El Mallaha area. Esh EL Mallaha area is located on the western flank of the Gulf of Suez and it has a great importance due to its hydrocarbon resources. In 1994 the area was covered by aeromagnetic survey conducted by Aero Service Division, Western Geophysical Company of America. The main object of this work to delineate the subsurface structural framework of the area that may assist in hydrocarbon exploration. A 3D analytic signal technique was applied to the aeromagnetic data. One of the most advantages of the analytic signal is that it produces a maximum value over a 2D magnetic source and as a result it enables more accurate location of the magnetic sources. It is also straight forward to determine the depth to the magnetic contacts using a simple formula derived from the analytic signal. Generally, Esh EL Mallaha area is characterized by two basinal structures taking the direction of the NW-SE parallel...
ABSTRACT Sibayak geothermal field is located about 65 km to the southwest of Medan in the North S... more ABSTRACT Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Province, Indonesia. Recently, a small-scale geothermal power plant (2 MWe) has been installed in this area. Since electricity demand increases in the North Sumatra Province, Pertamina (Geothermal Division) plans to increase the capacity to 20 MWe in the year 2005. Accordingly, detailed knowledge of the reservoir structure and its extension must be determined. The mise-a-la-masse (MAM) surveys were carried out in this field using the exploration well SBY-1 and the production well SBY-4 to delineate a new production target for further field development. Interpretation of the MAM data was done to correlate the results with formation temperatures and lost circulation zones and finally to image a promising reservoir zone. This interpretation result of MAM data indicates that reservoir zones trends to the north-northeast direction of the study area and shows a good correlation with formation temperature and lost circulation zone. This fact leads us to propose that the best production target for the development of the Sibayak area is characterized by the high temperature, high permeability and high well productivity region marked by the dome-shaped resistivity zone below the conductive cap rocks.
Memoirs of the Faculty of Engineering. Kyushu University, 2006
Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Pr... more Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Province, Indonesia. Starting from 1998, a small-scale geothermal power plant (2 MWe) has been installed in this area. Since electricity demand increases in the North Sumatra Province, Pertamina Geothermal Energy plans to increase the capacity to 20 MWe. Accordingly, detailed knowledge of the reservoir structure and its extension must be determined for a new production target. The mise-a-la-masse (MAM) surveys were carried out in this field using the exploration well SBY-1 and the production well SBY-4 to delineate a new production target for further field development. A conventional one-dimensional MAM data processing has been done to obtain lateral variation of subsurface resistivity. However, the result is not satisfied to image real condition of the geology on the subsurface. Therefore, we carried out an advanced 3-D MAM inversion based on the smoothness-constrained least-squares metho...
DC Resistivity analysis was carried out in the Sibayak geothermal using Schlumberger Vertical Ele... more DC Resistivity analysis was carried out in the Sibayak geothermal using Schlumberger Vertical Electrical Sounding (VES) during a preliminary study in 1990. The resistivity data has been processed conventionally using one-dimensional (1-D) inversion to estimate vertical variation of resistivity related to hydrothermal activity at shallow depths of less than 1 km. Subsequently, the inversion results were correlated to develop a 2-D resistivity section; afterwards, it was combined with the MT data processing result. However, the results of 1-D inversion of DC resistivity are not fully satisfactory for actual 3-D structures such as geothermal systems. Therefore, we have re-processed the same Schlumberger VES data set by performing a 2-D inversion based on ABIC least squares method. The 2-D inversion result shows a more realistic feature in terms of geological structure. Caldera boundaries and a dome-like structure of the low resistivity are clearly determined, indicating an up-flow zone...
Summary Significant improvements in the magnetic survey, design, processing and most important, r... more Summary Significant improvements in the magnetic survey, design, processing and most important, resolution of aeromagnetic data could provide detailed information on the spatial distribution, geometry, and structural style of faults and fracture systems. The magnetic data can easily integrate/merge and correlated with other available data (e.g. gravity, geology, seismic, topography). The integration of these data provides an excellent approach for structural system and evaluation of hydrocarbon plays in Esh El Mellaha area, Gulf of Suez. In this paper, enhancements and filtering of aeromagnetic data were implemented using band-pass filter and horizontal gradient technique. The results are compared with the available information; such as geologic map, drill-hole data, topographic data, and 2D seismic data in the northern part of the area. In general, the area is dissected by a system of faults most of them trending in the NW-SE (Red Sea trend) and NEE-SWW (Tethyan trend). Introduction:
ABSTRACT Repeated gravity measurements have been applied at the Kamojang geothermal field in Indo... more ABSTRACT Repeated gravity measurements have been applied at the Kamojang geothermal field in Indonesia. Previously, we used only relative gravimeters to measure precise gravity change. We detected gravity changes caused by the production and ...
ABSTRACT Repeated gravity measurements have been applied at the Kamojang geothermal field in Indo... more ABSTRACT Repeated gravity measurements have been applied at the Kamojang geothermal field in Indonesia. Previously, we used only relative gravimeters to measure precise gravity change. We detected gravity changes caused by the production and ...
Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Pr... more Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Province, Indonesia. Starting from 1998, a small-scale geothermal power plant (2 MWe) has been installed in this area. Since electricity demand increases in the North Sumatra Province, Pertamina Geothermal Energy plans to increase the capacity to 20 MWe. Accordingly, detailed knowledge of the reservoir structure and its extension must be determined for a new production target. The mise-a-la-masse (MAM) surveys were carried out in this field using the exploration well SBY-1 and the production well SBY-4 to delineate a new production target for further field development. A conventional one-dimensional MAM data processing has been done to obtain lateral variation of subsurface resistivity. However, the result is not satisfied to image real condition of the geology on the subsurface. Therefore, we carried out an advanced 3-D MAM inversion based on the smoothness-constrained least-squares metho...
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