THE 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCE EDUCATION (ICoMSE) 2020: Innovative Research in Science and Mathematics Education in The Disruptive Era
At the development stage of a geothermal field, a comprehensive survey is needed to obtain an acc... more At the development stage of a geothermal field, a comprehensive survey is needed to obtain an accurate picture of the geothermal system to identify the subsurface condition on the prospect field. The geological structure is one of the important aspects of geothermal exploration. It creates permeability, which allows geothermal fluids to flow to the surface. Locating geological structures in the prospect area will be a powerful tool to determine the drilling target for exploration or production wells. One of the methods to identify geological structure on the surface is using satellite imagery. It is based on visual interpretation of the morpho-structural aspect combined with the lithological aspect and then confirmed with field data. The remote sensing data is built from DEMNAS data and a regional geological map. DEMNAS has spatial resolution 0,27-arcsecond, vertical datum EGM2008. While the subsurface geological structure can be identified by using the Gravity Second Vertical Derivative (SVD) and First Horizontal Derivative (FHD) method. Gravity method identifies structure by slicing the SVD grid, which has suspected structure and then confirmed with FHD slicing in the same suspected area. The geological structure will be confirmed if the value of FHD maximum and SVD value 0. The results of the data processing above are then integrated to obtain the distribution of geological structures as a permeable zone in the geothermal field which then can be used as a guide in determining the location of exploration and production wells.
THE 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCE EDUCATION (ICoMSE) 2020: Innovative Research in Science and Mathematics Education in The Disruptive Era
THE 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCE EDUCATION (ICoMSE) 2020: Innovative Research in Science and Mathematics Education in The Disruptive Era
Struktur patahan mempunyai peran penting dalam suatu sistem panas bumi. Struktur patahan dapat me... more Struktur patahan mempunyai peran penting dalam suatu sistem panas bumi. Struktur patahan dapat menyediakan zona lemah yang menjadi lokasi terjadinya intrusi yang terkait dengan sumber panas, menyediakan permeabilitas bagi reservoar, dan sebagai jalur aliran fluida menuju ke permukaan yang muncul sebagai manifestasi. Dengan memahami karakterisasi dan persebaran struktur geologi pada lapangan panas bumi, maka model konseptual sistem panas bumi dapat dipahami secara lebih baik, sehingga risiko kegagalan akibat ketidakpastian dalam pengembangan panas bumi di bagian bawah permukaan dapat diminimalisir. Lapangan X berada di Pulau Sumatra, termasuk lapangan panas bumi yang masih terus dikembangkan dan berusaha untuk mendapatkan lokasi sumur optimal untuk diproduksi. Penelitian ini membahas mengenai struktur patahan di lapangan panas bumi X menggunakan analisis data gaya berat, penginderaan jauh dan hasil pemetaan geologi. Secara detil, analisis data gaya berat yang dilakukan meliputi korek...
THE 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCE EDUCATION (ICoMSE) 2020: Innovative Research in Science and Mathematics Education in The Disruptive Era
We present a novel tectonic and structural framework for the Sumatran Volcanic Arc and Sumatran F... more We present a novel tectonic and structural framework for the Sumatran Volcanic Arc and Sumatran Fault System (SFS), based on a comprehensive compilation of the controls of heterogeneities in both s...
Indonesia with its large, but partially unexplored geothermal potential is one of the most intere... more Indonesia with its large, but partially unexplored geothermal potential is one of the most interesting and suitable places in the world to conduct geothermal exploration research. This study focuses on geothermal exploration based on fluid-rock geochemistry/geomechanics and aims to compile an overview on geochemical data-rock properties from important geothermal fields in Indonesia. The research carried out in the field and in the laboratory is performed in the framework of the GEOCAP cooperation (Geothermal Capacity Building program Indonesiathe Netherlands). The application of petrology and geochemistry accounts to a better understanding of areas where operating power plants exist but also helps in the initial exploration stage of green areas. Because of their relevance and geological setting geothermal fields in Java (Wayang Windu, Tanguban Perahu) have been visited so far. Mount Salak, Gunung Slamet (Java) and Flores surveys are planned in the near future. Operators, universitie...
IOP Conference Series: Earth and Environmental Science, 2020
The Gravity method is a geophysical method that is widely used for geothermal exploration. The us... more The Gravity method is a geophysical method that is widely used for geothermal exploration. The use of gravity data is commonly limited to interpretation of geological structure using 2-D modeling. In this study, 3-D inversion of gravity data conducted to improve 3-D conceptual model of geothermal system. This method was applied in Tulehu geothermal prospect area, which is located in Maluku Province. In 2019, gravity survey was conducted for geothermal exploration in Tulehu by gridding measurement of 130 stations with 500 m spacing. The geological condition of the area is dominated by quaternary volcanic rocks, limestone, alluvial, and metamorphic rocks. The result of CBA and residual gravity indicate the existence of medium gravity anomaly at the Mt. Eriwakang, the high gravity anomalies are found around several structures obtained from Remote Sensing. In the section of gravity 3-D inversion, it shows that the low-density contrast can be seen at 2000–3500 meter and 4500–7000 meter, ...
IOP Conference Series: Earth and Environmental Science, 2020
This research studies microearthquake (MEQ) data analysis in “X” geothermal field. The data was r... more This research studies microearthquake (MEQ) data analysis in “X” geothermal field. The data was recorded in two phases; before and during drilling, with a total number of 2863 events recorded. The quality assessment method was applied using wadati diagram analysis in order to select the best quality data for advance processing. The result shows that the MEQ events are having trend of Vp/Vs ratio around 1.76. The MEQ data then processed using tomography inversion technique to obtain the image of subsurface seismic velocity structure. The results of seismic tomography inversion shows anomaly pattern which consistent with the lithology and geological structure. The results also shows a good agreement with the interpretation of resistivity section from magnetotelluric (MT) data, as well as from geochemical data. The region infered as reservoir zone are observed with dominantly high Vp/Vs anomaly which indicates incompressible characteristics that may relate to existence of water content...
IOP Conference Series: Earth and Environmental Science, 2020
Tulehu is in the eastern part of the island of Ambon, Maluku. The research area is in some villag... more Tulehu is in the eastern part of the island of Ambon, Maluku. The research area is in some village; Suli, Tial, Tulehu, and Waai, Salahutu District, Maluku Province with a research area size of approximately 10 x 10 km2. It is an area with a high geothermal prospect. Much research has been carried out here to study the geological, geochemical and geophysical conditions of it. The reservoir is estimated to reach more than 230 °C based on geochemistry. This study will focus on discussing the surface geological conditions of the Tulehu area based on the interpretation of satellite imagery and field observations data that have been carried out in the form of structure and rock unit data. This research image of satellite imagery data consists of Landsat 8, and DEM processed using ArcGIS 10.2.1 software. The results show that the study area is composed of 4 rock units which are sequentially from the oldest to the youngest namely Lava Flow (early Pliocene-middle Pliocene), Pyroclastic Flow...
IOP Conference Series: Earth and Environmental Science, 2020
Nowadays geothermal exploration in Indonesia is beginning to reach small islands, most of which h... more Nowadays geothermal exploration in Indonesia is beginning to reach small islands, most of which have a prospect in the coastal area. This has influences on the MT data modelling due to the distortion of the electric field component caused by the extreme contrast of resistivity between land and sea. In these conditions, it is necessary to apply the correction of the coast effects. The seawater resistivity (0.3 Ωm) must be included in the 3-D MT modelling. A simulation was conducted to observe coast effects on 3-D MT modelling. Forward 3-D MT modelling is done to obtain synthetic data to compare homogeneous model and coast effects model. The simulation results show that the presence of seawater affects all MT data frequencies, but the most significant distortion occurs in the low frequency. The affected frequency range correlates with the distance between the MT station and seawater. If the distance of MT station to the sea is getting closer, then the disturbed frequency range is grea...
THE 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCE EDUCATION (ICoMSE) 2020: Innovative Research in Science and Mathematics Education in The Disruptive Era
At the development stage of a geothermal field, a comprehensive survey is needed to obtain an acc... more At the development stage of a geothermal field, a comprehensive survey is needed to obtain an accurate picture of the geothermal system to identify the subsurface condition on the prospect field. The geological structure is one of the important aspects of geothermal exploration. It creates permeability, which allows geothermal fluids to flow to the surface. Locating geological structures in the prospect area will be a powerful tool to determine the drilling target for exploration or production wells. One of the methods to identify geological structure on the surface is using satellite imagery. It is based on visual interpretation of the morpho-structural aspect combined with the lithological aspect and then confirmed with field data. The remote sensing data is built from DEMNAS data and a regional geological map. DEMNAS has spatial resolution 0,27-arcsecond, vertical datum EGM2008. While the subsurface geological structure can be identified by using the Gravity Second Vertical Derivative (SVD) and First Horizontal Derivative (FHD) method. Gravity method identifies structure by slicing the SVD grid, which has suspected structure and then confirmed with FHD slicing in the same suspected area. The geological structure will be confirmed if the value of FHD maximum and SVD value 0. The results of the data processing above are then integrated to obtain the distribution of geological structures as a permeable zone in the geothermal field which then can be used as a guide in determining the location of exploration and production wells.
THE 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCE EDUCATION (ICoMSE) 2020: Innovative Research in Science and Mathematics Education in The Disruptive Era
THE 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCE EDUCATION (ICoMSE) 2020: Innovative Research in Science and Mathematics Education in The Disruptive Era
Struktur patahan mempunyai peran penting dalam suatu sistem panas bumi. Struktur patahan dapat me... more Struktur patahan mempunyai peran penting dalam suatu sistem panas bumi. Struktur patahan dapat menyediakan zona lemah yang menjadi lokasi terjadinya intrusi yang terkait dengan sumber panas, menyediakan permeabilitas bagi reservoar, dan sebagai jalur aliran fluida menuju ke permukaan yang muncul sebagai manifestasi. Dengan memahami karakterisasi dan persebaran struktur geologi pada lapangan panas bumi, maka model konseptual sistem panas bumi dapat dipahami secara lebih baik, sehingga risiko kegagalan akibat ketidakpastian dalam pengembangan panas bumi di bagian bawah permukaan dapat diminimalisir. Lapangan X berada di Pulau Sumatra, termasuk lapangan panas bumi yang masih terus dikembangkan dan berusaha untuk mendapatkan lokasi sumur optimal untuk diproduksi. Penelitian ini membahas mengenai struktur patahan di lapangan panas bumi X menggunakan analisis data gaya berat, penginderaan jauh dan hasil pemetaan geologi. Secara detil, analisis data gaya berat yang dilakukan meliputi korek...
THE 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCE EDUCATION (ICoMSE) 2020: Innovative Research in Science and Mathematics Education in The Disruptive Era
We present a novel tectonic and structural framework for the Sumatran Volcanic Arc and Sumatran F... more We present a novel tectonic and structural framework for the Sumatran Volcanic Arc and Sumatran Fault System (SFS), based on a comprehensive compilation of the controls of heterogeneities in both s...
Indonesia with its large, but partially unexplored geothermal potential is one of the most intere... more Indonesia with its large, but partially unexplored geothermal potential is one of the most interesting and suitable places in the world to conduct geothermal exploration research. This study focuses on geothermal exploration based on fluid-rock geochemistry/geomechanics and aims to compile an overview on geochemical data-rock properties from important geothermal fields in Indonesia. The research carried out in the field and in the laboratory is performed in the framework of the GEOCAP cooperation (Geothermal Capacity Building program Indonesiathe Netherlands). The application of petrology and geochemistry accounts to a better understanding of areas where operating power plants exist but also helps in the initial exploration stage of green areas. Because of their relevance and geological setting geothermal fields in Java (Wayang Windu, Tanguban Perahu) have been visited so far. Mount Salak, Gunung Slamet (Java) and Flores surveys are planned in the near future. Operators, universitie...
IOP Conference Series: Earth and Environmental Science, 2020
The Gravity method is a geophysical method that is widely used for geothermal exploration. The us... more The Gravity method is a geophysical method that is widely used for geothermal exploration. The use of gravity data is commonly limited to interpretation of geological structure using 2-D modeling. In this study, 3-D inversion of gravity data conducted to improve 3-D conceptual model of geothermal system. This method was applied in Tulehu geothermal prospect area, which is located in Maluku Province. In 2019, gravity survey was conducted for geothermal exploration in Tulehu by gridding measurement of 130 stations with 500 m spacing. The geological condition of the area is dominated by quaternary volcanic rocks, limestone, alluvial, and metamorphic rocks. The result of CBA and residual gravity indicate the existence of medium gravity anomaly at the Mt. Eriwakang, the high gravity anomalies are found around several structures obtained from Remote Sensing. In the section of gravity 3-D inversion, it shows that the low-density contrast can be seen at 2000–3500 meter and 4500–7000 meter, ...
IOP Conference Series: Earth and Environmental Science, 2020
This research studies microearthquake (MEQ) data analysis in “X” geothermal field. The data was r... more This research studies microearthquake (MEQ) data analysis in “X” geothermal field. The data was recorded in two phases; before and during drilling, with a total number of 2863 events recorded. The quality assessment method was applied using wadati diagram analysis in order to select the best quality data for advance processing. The result shows that the MEQ events are having trend of Vp/Vs ratio around 1.76. The MEQ data then processed using tomography inversion technique to obtain the image of subsurface seismic velocity structure. The results of seismic tomography inversion shows anomaly pattern which consistent with the lithology and geological structure. The results also shows a good agreement with the interpretation of resistivity section from magnetotelluric (MT) data, as well as from geochemical data. The region infered as reservoir zone are observed with dominantly high Vp/Vs anomaly which indicates incompressible characteristics that may relate to existence of water content...
IOP Conference Series: Earth and Environmental Science, 2020
Tulehu is in the eastern part of the island of Ambon, Maluku. The research area is in some villag... more Tulehu is in the eastern part of the island of Ambon, Maluku. The research area is in some village; Suli, Tial, Tulehu, and Waai, Salahutu District, Maluku Province with a research area size of approximately 10 x 10 km2. It is an area with a high geothermal prospect. Much research has been carried out here to study the geological, geochemical and geophysical conditions of it. The reservoir is estimated to reach more than 230 °C based on geochemistry. This study will focus on discussing the surface geological conditions of the Tulehu area based on the interpretation of satellite imagery and field observations data that have been carried out in the form of structure and rock unit data. This research image of satellite imagery data consists of Landsat 8, and DEM processed using ArcGIS 10.2.1 software. The results show that the study area is composed of 4 rock units which are sequentially from the oldest to the youngest namely Lava Flow (early Pliocene-middle Pliocene), Pyroclastic Flow...
IOP Conference Series: Earth and Environmental Science, 2020
Nowadays geothermal exploration in Indonesia is beginning to reach small islands, most of which h... more Nowadays geothermal exploration in Indonesia is beginning to reach small islands, most of which have a prospect in the coastal area. This has influences on the MT data modelling due to the distortion of the electric field component caused by the extreme contrast of resistivity between land and sea. In these conditions, it is necessary to apply the correction of the coast effects. The seawater resistivity (0.3 Ωm) must be included in the 3-D MT modelling. A simulation was conducted to observe coast effects on 3-D MT modelling. Forward 3-D MT modelling is done to obtain synthetic data to compare homogeneous model and coast effects model. The simulation results show that the presence of seawater affects all MT data frequencies, but the most significant distortion occurs in the low frequency. The affected frequency range correlates with the distance between the MT station and seawater. If the distance of MT station to the sea is getting closer, then the disturbed frequency range is grea...
Uploads
Papers by Yunus Daud