IOP Conference Series: Earth and Environmental Science
A new multibeam dataset of Nieuwerkerk and Emperor of China (NEC) seamounts was acquired during t... more A new multibeam dataset of Nieuwerkerk and Emperor of China (NEC) seamounts was acquired during the Jalacitra 2-2022 ”Banda” Expedition in the Banda Sea region. This study discusses a morphometric analysis of the seamounts based on a high-resolution bathymetry digital elevation model (DEM) and describes the morphometric features, namely: slope, profile curvature, and aspect. Morphological results indicate that the Nieuwerkerk seamount has an area of 2,416 km2 with a maximum peak elevation of approximately 3,460 m above the seabed and 357 m below the water surface. In the southwest of the Nieuwerkerk seamount, two new seamounts were discovered, which are still unnamed and seem morphologically connected to the Nieuwerkerk seamount. Each of the seamounts covers an area of 148 km2 and 220 km2, respectively, with a maximum peak elevation of approximately 2,338 m and 2,053 m above the seabed. Additionally, both seamounts have an elevation of 1,878 m and 2,017 m below the sea surface. Mean...
Jurnal Geologi dan Sumberdaya Mineral, Jan 14, 2024
Peta GDE Formasi Kelesa menunjukkan bahwa fasies batupasir yang berkembang pada susunan kipas flu... more Peta GDE Formasi Kelesa menunjukkan bahwa fasies batupasir yang berkembang pada susunan kipas fluvial dan aluvial di dekat batas cekungan berpotensi untuk eksplorasi hidrokarbon di masa depan.
The first detailed mapping and recording of nannofossils was carried out on Kei Besar Island, Sou... more The first detailed mapping and recording of nannofossils was carried out on Kei Besar Island, Southeast Maluku. This area is mostly composed of the Elat Formation, which is mainly composed by intercalated calcarenite and calcareous claystone. Total 48 samples were taken on three measured sections (Hollat, Ngurdu and Mata Hollat). Samples were prepared using smear slide method, then observed under a polarized microscope at 1000 x magnification. Total 48 species of nannofossils were identified. Several index species were selected to define biostratigraphic zones based on their first and last occurrence. Three zones of nannofossils are identified, starting with the oldest those are: Reticulofenestra umbilica zone (NP16; 43.06 to 38.7 million years ago), Helicosphaera compacta zone (NP17; 38.7 to 37.9 Mya) and Helicosphaera eupratis zone (NP18-NP19; 37.9-36.8 Mya). It can be concluded that Elat Formation is deposited in Middle to Late Eocene (43.06 to 35.4 Mya). The Middle-Late Eocene boundary can be clearly defined based on nannofossils assemblages in the section of the Kei Besar Island.
AB S T RACT : As it is widely known the oil and gas wellbores offshore Kutei and North Makassar h... more AB S T RACT : As it is widely known the oil and gas wellbores offshore Kutei and North Makassar have not optimally penetrated the objective strata, which is the Middle Miocene's deep-water reservoirs. Therefore, evaluating the quality of these reservoirs with onshore dataset then comparing them with the proven Late Miocene's deep-water producing reservoirs had been very fundamental. The study focuses on the assessment of QFL (Quartz, Feldspar and Lithic fragments) and sandstones litho-facies based on the rock samples from conventional-core and side-wall core, and well-logs data from forty wells onshore and offshore. These rock samples are bounded by the key biostratigraphy intervals of M40M33, M45M40, M50M45 (Middle Miocene), and M65M50, M66M65, M70M66, M80M70 (Late Miocene). Subdivisions of the reservoirs considered the sandstone litho facies, NTG ratio, sorting, and grain size, to come up with five groups in the Middle Miocene deltaic facies: FLU_SX, DC_SX, DC_SM, DC_SM, and DF_SC; and four groups in the Late Miocene deep-water facies: SSWS, MSWS, SSPS, and MSPS. Core-based porosity and permeability further explain the relationship between the reservoir quality with the sandstones' composition and litho facies, and concluded that high-energy depositional system is mainly associated with the FLU_SX, DC_SX, SSWS and MSWS being the reservoir with best quality. Oppositely, the DF_SC, SSPS, and MSPS are classified the reservoir with worst to none quality. A cross plot between core-based porosity and maximum burial depth is able to postulate the relational trend of decreasing reservoir quality with deeper depth.
Jurnal Geologi dan Sumberdaya Mineral, Feb 13, 2020
Abstrak-Iklim merupakan suatu kondisi rata-rata cuaca di suatu daerah dengan jangka waktu yang re... more Abstrak-Iklim merupakan suatu kondisi rata-rata cuaca di suatu daerah dengan jangka waktu yang relatif panjang. Iklim dapat mempengaruhi vegetasi yang berkembang di suatu daerah dalam interval waktu tertentu. Penelitian ini bertujuan untuk mengkaji perubahan iklim dan kelembaban yang berlangsung pada waktu Holosen di daerah Danau Bandung dan lingkungan di sekitarnya melalui analisis polen. Sampel diambil menggunakan bor tanah di kedalaman 172,5-52,5 cm pada litologi penyusun yang diinterpretasi sebagai endapan Danau Bandung Purba. Sebanyak 24 contoh di kedalaman 172,5-52-5 cm telah dilakukan analisis. Perubahan iklim dan kelembaban Danau Bandung Purba disintesis dengan membandingkan kuantitas polen, spora dan endapannya. Dijumpai empat periode perubahan iklim dalam lima interval iklim pada endapan gambut yang dicirikan oleh polen montane forest seperti Podocarpaceae, dan Pinaceae, polen lowland forest seperti Commelinaceae, Moraceae, spora dari Famili Polypodiaceae, Pteridaceae, dan Dennstaedtiaceae, dengan Gramineae di daerah penelitian.
Jurnal Geologi dan Sumberdaya Mineral, Apr 5, 2021
Massive exploration effort in the study area was conducted in 1996-2014 when deep-water drilling ... more Massive exploration effort in the study area was conducted in 1996-2014 when deep-water drilling campaign found significant oil and gas discoveries but yet to optimally reach the middle Miocene deep-water sandstone reservoirs. Outcrops, well bores and 2Dseismic data had been incorporated in this study. Datum age from several taxon indicators have been utilized to correlate and unify various markers across the study area into four key biostratigraphy markers: M40, M45, M50, and M65. These four markers are at that point tied to the 2D seismic data in the act of the main horizons in conducting the seismic stratigraphy analysis over the study area not reached by wells. Identifying candidate of sub-regional sequence boundaries onshore and offshore that correspond with relative sea-level drops are the main result of this study. These results were integrated to generate the deep-water fan facies of the middle Miocene's gross depositional environment (GDE) maps, which generally show prograding succession easterly in the various shelf-breaks shifting laterally. The angle of slope and the horizontal length of the shelf-to-slope breaks significantly change from the Middle to Late Miocene until Recent time.
Jurnal geologi kelautan : media hasil penelitian geologi kelautan, Aug 2, 2022
Perairan Tanjung Berikat merupakan salah satu perairan di daerah Pulau Bangka yang dilalui oleh j... more Perairan Tanjung Berikat merupakan salah satu perairan di daerah Pulau Bangka yang dilalui oleh jalur granit Asia Tenggara. Keberadaan jalur granit ini berhubungan erat dengan keterdapatan batuan granit yang berperan sebagai batuan sumber pembawa timah baik di daratan dan perairan. Namun demikian, keterdapatan Granit Klabat yang diketahui pada daerah Tanjung Berikat hanya batuan granit yang terlihat di darat saja. Sementara itu, jika melihat keterdapatan granit dalam bentuk singkapan maupun bongkah-bongkah pada wilayah pantai Tanjung Berikat dan sekitarnya, maka diduga adanya sebaran Granit Klabat ini menerus hingga ke arah laut. Metode yang digunakan ialah seismik saluran tunggal (single channel) dengan sumber suara berupa Boomer Single Plate dengan energi sebesar 400 Joule dan frekuensi 300-600 Hz. Dari rekaman seismik diinterpretasikan menjadi 4 (empat) unit dimana Unit-1, Unit-2, dan Unit-3 yang berada di atas basement akustik diduga berumur Kuarter. Basement akustik yang berumur Trias Awal kemudian diterobos oleh batuan yang diduga sebagai Granit Klabat. Selanjutnya dilakukan konturing menggunakan metode convergence interpolation. Hasil penelitian ini menunjukkan bahwa sebaran batuan Granit Klabat di daerah penelitian terlihat hingga area ±2,5 km dari garis pantai dengan kedalaman berkisar antara 20-80 milisecond pada bagian tengah-timur daerah penelitian dan 40-80 milisecond pada bagian barat daerah penelitian.
This study focuses on the analysis of sedimentary facies and ichnogenus variations to determine t... more This study focuses on the analysis of sedimentary facies and ichnogenus variations to determine the palaeogeographic setting of turbidite deposits that are clearly exposed in the surroundings of Majalengka area, West Java, Indonesia. Lithofacies variation in turbidite deposits, identified from detailed stratigraphic sections, were visually presented as a composite log and indicated a thickening and coarsening pattern due to a regressive event. Trace fossils exposed in all stratigraphic levels consist of Thalassinoides, Chondrites, Cruziana and Planolites. They are commonly found in a series of thin to medium bedded fine grained turbiditic sandstones intercalated with shales. Hereinafter, the integration analysis in between sedimentology and ichnology data, the sediment shed into the basin in the submarine channelized related to slope system. Such findings cast no doubt as to whether integrated sedimentary facies and ichnofacies analysis can be viewed as precise methods for sedimentary basin interpretation, in which external parameter, for example magmatic processes, also are considered to play a role.
A new multibeam dataset of Nieuwerkerk and Emperor of China (NEC) seamounts was acquired during t... more A new multibeam dataset of Nieuwerkerk and Emperor of China (NEC) seamounts was acquired during the Jalacitra 2-2022 ”Banda” Expedition in the Banda Sea region. This study discusses a morphometric analysis of the seamounts based on a high-resolution bathymetry digital elevation model (DEM) and describes the morphometric features, namely: slope, profile curvature, and aspect. Morphological results indicate that the Nieuwerkerk seamount has an area of 2,416 km2 with a maximum peak elevation of approximately 3,460 m above the seabed and 357 m below the water surface. In the southwest of the Nieuwerkerk seamount, two new seamounts were discovered, which are still unnamed and seem morphologically connected to the Nieuwerkerk seamount. Each of the seamounts covers an area of 148 km2 and 220 km2, respectively, with a maximum peak elevation of approximately 2,338 m and 2,053 m above the seabed. Additionally, both seamounts have an elevation of 1,878 m and 2,017 m below the sea surface. Meanwhile, the Emperor of China seamount is located southwest of the three formerly mentioned seamounts, with the maximum peak seats at 2,165 m below the sea surface. Seamount C is located in the west of the surveyed area and it covers an area of 95.6 km2 with an elevation of 1,834 m above the seabed. The results of regression analysis indicate that all of the features could be used for the morphological classification.
A regional development requires some analyses in terms of the constraint and the potential. Const... more A regional development requires some analyses in terms of the constraint and the potential. Constraints of a development need to be managed by periodic monitoring, while the potentials need to be maintained or optimally improved. The hexa-helix concept is a development of penta-helix concept with addition in the role of law and regulation. Citatah area is a multipurpose area where there is limestone quarry, factories, tourist attractions, and rock-climbing area as territoral potential. The constraints is found in Citatah are landslides and faults. To support the potential of the region, infrastructures need to be safe from landslide. The stable slopes have been built through terracing and engineered slopes. This research is directed to identify potentials and constraint in development of the Citatah area; evaluate safety factors around landslide prone areas; and inventory the role of hexa-helix agents in the infrastructure of road around the engineeried slope. The result shows that regional potential needs to be managed by utilizing the hexa-helix concept. Besides, the Citatah landslide zone needs to be aware. Environmental management and monitoring are required to avoid failure of development planning in the future. The result of this study will be useful for sustainable regional development in Citatah area.
The hydrocarbon source rock potential to determine of petroleum system in Majalengka sub-basin wa... more The hydrocarbon source rock potential to determine of petroleum system in Majalengka sub-basin was evaluated using Rock-Eval pyrolysis. Most of samples were taken in the middle to late Miocene of sediment turbidite, which well exposed along this basin. Result of analysis indicated that the hydrocarbon occurrence tend to built as gas prone dominated by kerogen type III in imamature to mature values. Thermal maturity increased parallel to succession of lithologic units, from lower to upper, due to the increasing of magmatic activity in this basin. The overall hydrocarbon source potential of Majalengka sub-basin is moderately low; the good accumulation of hydrocarbon probably exists locally within adjancent area. The reservoir type in this basin is massive sandstone, which forms channel-like bodies. Stratigraphic and structural trappings are two types of trapping mechanism. Furthermore, those of elements (source-rocks potential, reservoir, seals) form the petroleum system in Majalengka sub-basin. The petroleum system in this area is interpreted related to subduction mechanism during the middle to late Miocene and occurred at intraarc (back-arc) basin.
Majalengka sub-basin is located at the middle part of West Java. This basin, regionally, is part ... more Majalengka sub-basin is located at the middle part of West Java. This basin, regionally, is part of Bogor trough, a back-arc basin. The basin is sedimentary basin formed during the early Tertiary. Getting into the middle to late Miocene, sedimentation in this basin was dominated by a turbidite derived from multiple-source, Northwest Java basin in the north and the South Mountain in the south. The occurrence of organic matter in this basin is estimated from the north sedimentation source. Based on rock-eval pyrolysis and vitrinite reflectance methods shows that the hydrocarbon source potential is dominated by immature to mature and gas prone type III kerogen. This kerogen type is mainly composed as a product from terrestrial material deposited into deltaic to shallow marine. Preservation of organic material in turbidite is interpreted as results from resedimentation or sedimentation transportation through the channel systems. In addition, magmatism and tectonism is the main parameter to generate organic matter become hydrocarbon.
The sandstone of turbidite series of Majalengka sub-basin varies in geochemical composition. This... more The sandstone of turbidite series of Majalengka sub-basin varies in geochemical composition. This series, based on biostratigraphy evidence, can be divided into two portions; lower and upper parts. This study was conducted to determine the relationships between sandstone composition and tectonic setting. The SiO 2 and Na 2 O contents are enriched in compare to another major element (e.
IOP Conference Series: Earth and Environmental Science
A new multibeam dataset of Nieuwerkerk and Emperor of China (NEC) seamounts was acquired during t... more A new multibeam dataset of Nieuwerkerk and Emperor of China (NEC) seamounts was acquired during the Jalacitra 2-2022 ”Banda” Expedition in the Banda Sea region. This study discusses a morphometric analysis of the seamounts based on a high-resolution bathymetry digital elevation model (DEM) and describes the morphometric features, namely: slope, profile curvature, and aspect. Morphological results indicate that the Nieuwerkerk seamount has an area of 2,416 km2 with a maximum peak elevation of approximately 3,460 m above the seabed and 357 m below the water surface. In the southwest of the Nieuwerkerk seamount, two new seamounts were discovered, which are still unnamed and seem morphologically connected to the Nieuwerkerk seamount. Each of the seamounts covers an area of 148 km2 and 220 km2, respectively, with a maximum peak elevation of approximately 2,338 m and 2,053 m above the seabed. Additionally, both seamounts have an elevation of 1,878 m and 2,017 m below the sea surface. Mean...
Jurnal Geologi dan Sumberdaya Mineral, Jan 14, 2024
Peta GDE Formasi Kelesa menunjukkan bahwa fasies batupasir yang berkembang pada susunan kipas flu... more Peta GDE Formasi Kelesa menunjukkan bahwa fasies batupasir yang berkembang pada susunan kipas fluvial dan aluvial di dekat batas cekungan berpotensi untuk eksplorasi hidrokarbon di masa depan.
The first detailed mapping and recording of nannofossils was carried out on Kei Besar Island, Sou... more The first detailed mapping and recording of nannofossils was carried out on Kei Besar Island, Southeast Maluku. This area is mostly composed of the Elat Formation, which is mainly composed by intercalated calcarenite and calcareous claystone. Total 48 samples were taken on three measured sections (Hollat, Ngurdu and Mata Hollat). Samples were prepared using smear slide method, then observed under a polarized microscope at 1000 x magnification. Total 48 species of nannofossils were identified. Several index species were selected to define biostratigraphic zones based on their first and last occurrence. Three zones of nannofossils are identified, starting with the oldest those are: Reticulofenestra umbilica zone (NP16; 43.06 to 38.7 million years ago), Helicosphaera compacta zone (NP17; 38.7 to 37.9 Mya) and Helicosphaera eupratis zone (NP18-NP19; 37.9-36.8 Mya). It can be concluded that Elat Formation is deposited in Middle to Late Eocene (43.06 to 35.4 Mya). The Middle-Late Eocene boundary can be clearly defined based on nannofossils assemblages in the section of the Kei Besar Island.
AB S T RACT : As it is widely known the oil and gas wellbores offshore Kutei and North Makassar h... more AB S T RACT : As it is widely known the oil and gas wellbores offshore Kutei and North Makassar have not optimally penetrated the objective strata, which is the Middle Miocene's deep-water reservoirs. Therefore, evaluating the quality of these reservoirs with onshore dataset then comparing them with the proven Late Miocene's deep-water producing reservoirs had been very fundamental. The study focuses on the assessment of QFL (Quartz, Feldspar and Lithic fragments) and sandstones litho-facies based on the rock samples from conventional-core and side-wall core, and well-logs data from forty wells onshore and offshore. These rock samples are bounded by the key biostratigraphy intervals of M40M33, M45M40, M50M45 (Middle Miocene), and M65M50, M66M65, M70M66, M80M70 (Late Miocene). Subdivisions of the reservoirs considered the sandstone litho facies, NTG ratio, sorting, and grain size, to come up with five groups in the Middle Miocene deltaic facies: FLU_SX, DC_SX, DC_SM, DC_SM, and DF_SC; and four groups in the Late Miocene deep-water facies: SSWS, MSWS, SSPS, and MSPS. Core-based porosity and permeability further explain the relationship between the reservoir quality with the sandstones' composition and litho facies, and concluded that high-energy depositional system is mainly associated with the FLU_SX, DC_SX, SSWS and MSWS being the reservoir with best quality. Oppositely, the DF_SC, SSPS, and MSPS are classified the reservoir with worst to none quality. A cross plot between core-based porosity and maximum burial depth is able to postulate the relational trend of decreasing reservoir quality with deeper depth.
Jurnal Geologi dan Sumberdaya Mineral, Feb 13, 2020
Abstrak-Iklim merupakan suatu kondisi rata-rata cuaca di suatu daerah dengan jangka waktu yang re... more Abstrak-Iklim merupakan suatu kondisi rata-rata cuaca di suatu daerah dengan jangka waktu yang relatif panjang. Iklim dapat mempengaruhi vegetasi yang berkembang di suatu daerah dalam interval waktu tertentu. Penelitian ini bertujuan untuk mengkaji perubahan iklim dan kelembaban yang berlangsung pada waktu Holosen di daerah Danau Bandung dan lingkungan di sekitarnya melalui analisis polen. Sampel diambil menggunakan bor tanah di kedalaman 172,5-52,5 cm pada litologi penyusun yang diinterpretasi sebagai endapan Danau Bandung Purba. Sebanyak 24 contoh di kedalaman 172,5-52-5 cm telah dilakukan analisis. Perubahan iklim dan kelembaban Danau Bandung Purba disintesis dengan membandingkan kuantitas polen, spora dan endapannya. Dijumpai empat periode perubahan iklim dalam lima interval iklim pada endapan gambut yang dicirikan oleh polen montane forest seperti Podocarpaceae, dan Pinaceae, polen lowland forest seperti Commelinaceae, Moraceae, spora dari Famili Polypodiaceae, Pteridaceae, dan Dennstaedtiaceae, dengan Gramineae di daerah penelitian.
Jurnal Geologi dan Sumberdaya Mineral, Apr 5, 2021
Massive exploration effort in the study area was conducted in 1996-2014 when deep-water drilling ... more Massive exploration effort in the study area was conducted in 1996-2014 when deep-water drilling campaign found significant oil and gas discoveries but yet to optimally reach the middle Miocene deep-water sandstone reservoirs. Outcrops, well bores and 2Dseismic data had been incorporated in this study. Datum age from several taxon indicators have been utilized to correlate and unify various markers across the study area into four key biostratigraphy markers: M40, M45, M50, and M65. These four markers are at that point tied to the 2D seismic data in the act of the main horizons in conducting the seismic stratigraphy analysis over the study area not reached by wells. Identifying candidate of sub-regional sequence boundaries onshore and offshore that correspond with relative sea-level drops are the main result of this study. These results were integrated to generate the deep-water fan facies of the middle Miocene's gross depositional environment (GDE) maps, which generally show prograding succession easterly in the various shelf-breaks shifting laterally. The angle of slope and the horizontal length of the shelf-to-slope breaks significantly change from the Middle to Late Miocene until Recent time.
Jurnal geologi kelautan : media hasil penelitian geologi kelautan, Aug 2, 2022
Perairan Tanjung Berikat merupakan salah satu perairan di daerah Pulau Bangka yang dilalui oleh j... more Perairan Tanjung Berikat merupakan salah satu perairan di daerah Pulau Bangka yang dilalui oleh jalur granit Asia Tenggara. Keberadaan jalur granit ini berhubungan erat dengan keterdapatan batuan granit yang berperan sebagai batuan sumber pembawa timah baik di daratan dan perairan. Namun demikian, keterdapatan Granit Klabat yang diketahui pada daerah Tanjung Berikat hanya batuan granit yang terlihat di darat saja. Sementara itu, jika melihat keterdapatan granit dalam bentuk singkapan maupun bongkah-bongkah pada wilayah pantai Tanjung Berikat dan sekitarnya, maka diduga adanya sebaran Granit Klabat ini menerus hingga ke arah laut. Metode yang digunakan ialah seismik saluran tunggal (single channel) dengan sumber suara berupa Boomer Single Plate dengan energi sebesar 400 Joule dan frekuensi 300-600 Hz. Dari rekaman seismik diinterpretasikan menjadi 4 (empat) unit dimana Unit-1, Unit-2, dan Unit-3 yang berada di atas basement akustik diduga berumur Kuarter. Basement akustik yang berumur Trias Awal kemudian diterobos oleh batuan yang diduga sebagai Granit Klabat. Selanjutnya dilakukan konturing menggunakan metode convergence interpolation. Hasil penelitian ini menunjukkan bahwa sebaran batuan Granit Klabat di daerah penelitian terlihat hingga area ±2,5 km dari garis pantai dengan kedalaman berkisar antara 20-80 milisecond pada bagian tengah-timur daerah penelitian dan 40-80 milisecond pada bagian barat daerah penelitian.
This study focuses on the analysis of sedimentary facies and ichnogenus variations to determine t... more This study focuses on the analysis of sedimentary facies and ichnogenus variations to determine the palaeogeographic setting of turbidite deposits that are clearly exposed in the surroundings of Majalengka area, West Java, Indonesia. Lithofacies variation in turbidite deposits, identified from detailed stratigraphic sections, were visually presented as a composite log and indicated a thickening and coarsening pattern due to a regressive event. Trace fossils exposed in all stratigraphic levels consist of Thalassinoides, Chondrites, Cruziana and Planolites. They are commonly found in a series of thin to medium bedded fine grained turbiditic sandstones intercalated with shales. Hereinafter, the integration analysis in between sedimentology and ichnology data, the sediment shed into the basin in the submarine channelized related to slope system. Such findings cast no doubt as to whether integrated sedimentary facies and ichnofacies analysis can be viewed as precise methods for sedimentary basin interpretation, in which external parameter, for example magmatic processes, also are considered to play a role.
A new multibeam dataset of Nieuwerkerk and Emperor of China (NEC) seamounts was acquired during t... more A new multibeam dataset of Nieuwerkerk and Emperor of China (NEC) seamounts was acquired during the Jalacitra 2-2022 ”Banda” Expedition in the Banda Sea region. This study discusses a morphometric analysis of the seamounts based on a high-resolution bathymetry digital elevation model (DEM) and describes the morphometric features, namely: slope, profile curvature, and aspect. Morphological results indicate that the Nieuwerkerk seamount has an area of 2,416 km2 with a maximum peak elevation of approximately 3,460 m above the seabed and 357 m below the water surface. In the southwest of the Nieuwerkerk seamount, two new seamounts were discovered, which are still unnamed and seem morphologically connected to the Nieuwerkerk seamount. Each of the seamounts covers an area of 148 km2 and 220 km2, respectively, with a maximum peak elevation of approximately 2,338 m and 2,053 m above the seabed. Additionally, both seamounts have an elevation of 1,878 m and 2,017 m below the sea surface. Meanwhile, the Emperor of China seamount is located southwest of the three formerly mentioned seamounts, with the maximum peak seats at 2,165 m below the sea surface. Seamount C is located in the west of the surveyed area and it covers an area of 95.6 km2 with an elevation of 1,834 m above the seabed. The results of regression analysis indicate that all of the features could be used for the morphological classification.
A regional development requires some analyses in terms of the constraint and the potential. Const... more A regional development requires some analyses in terms of the constraint and the potential. Constraints of a development need to be managed by periodic monitoring, while the potentials need to be maintained or optimally improved. The hexa-helix concept is a development of penta-helix concept with addition in the role of law and regulation. Citatah area is a multipurpose area where there is limestone quarry, factories, tourist attractions, and rock-climbing area as territoral potential. The constraints is found in Citatah are landslides and faults. To support the potential of the region, infrastructures need to be safe from landslide. The stable slopes have been built through terracing and engineered slopes. This research is directed to identify potentials and constraint in development of the Citatah area; evaluate safety factors around landslide prone areas; and inventory the role of hexa-helix agents in the infrastructure of road around the engineeried slope. The result shows that regional potential needs to be managed by utilizing the hexa-helix concept. Besides, the Citatah landslide zone needs to be aware. Environmental management and monitoring are required to avoid failure of development planning in the future. The result of this study will be useful for sustainable regional development in Citatah area.
The hydrocarbon source rock potential to determine of petroleum system in Majalengka sub-basin wa... more The hydrocarbon source rock potential to determine of petroleum system in Majalengka sub-basin was evaluated using Rock-Eval pyrolysis. Most of samples were taken in the middle to late Miocene of sediment turbidite, which well exposed along this basin. Result of analysis indicated that the hydrocarbon occurrence tend to built as gas prone dominated by kerogen type III in imamature to mature values. Thermal maturity increased parallel to succession of lithologic units, from lower to upper, due to the increasing of magmatic activity in this basin. The overall hydrocarbon source potential of Majalengka sub-basin is moderately low; the good accumulation of hydrocarbon probably exists locally within adjancent area. The reservoir type in this basin is massive sandstone, which forms channel-like bodies. Stratigraphic and structural trappings are two types of trapping mechanism. Furthermore, those of elements (source-rocks potential, reservoir, seals) form the petroleum system in Majalengka sub-basin. The petroleum system in this area is interpreted related to subduction mechanism during the middle to late Miocene and occurred at intraarc (back-arc) basin.
Majalengka sub-basin is located at the middle part of West Java. This basin, regionally, is part ... more Majalengka sub-basin is located at the middle part of West Java. This basin, regionally, is part of Bogor trough, a back-arc basin. The basin is sedimentary basin formed during the early Tertiary. Getting into the middle to late Miocene, sedimentation in this basin was dominated by a turbidite derived from multiple-source, Northwest Java basin in the north and the South Mountain in the south. The occurrence of organic matter in this basin is estimated from the north sedimentation source. Based on rock-eval pyrolysis and vitrinite reflectance methods shows that the hydrocarbon source potential is dominated by immature to mature and gas prone type III kerogen. This kerogen type is mainly composed as a product from terrestrial material deposited into deltaic to shallow marine. Preservation of organic material in turbidite is interpreted as results from resedimentation or sedimentation transportation through the channel systems. In addition, magmatism and tectonism is the main parameter to generate organic matter become hydrocarbon.
The sandstone of turbidite series of Majalengka sub-basin varies in geochemical composition. This... more The sandstone of turbidite series of Majalengka sub-basin varies in geochemical composition. This series, based on biostratigraphy evidence, can be divided into two portions; lower and upper parts. This study was conducted to determine the relationships between sandstone composition and tectonic setting. The SiO 2 and Na 2 O contents are enriched in compare to another major element (e.
Bangka Belitung has known as Island that is traversed by the Southeast Asian granite belt. Tanjun... more Bangka Belitung has known as Island that is traversed by the Southeast Asian granite belt. Tanjung Berikat waters are one of the waters in Central Bangka Regency that is traversed by the Southeast Asian granite belt, so it has various potential mineral placers such as silica sand (that showed by quartz content). This study aims to determine the content and distribution of quartz minerals, sediment grain size, bathymetry, and the correlation between these variables with each other. We used shallow reflection single channel seismic and surficial seabed sediment sampling. Data processing and analysis consist of processing signals and seismic data interpretation, sieve grain mineralogy analysis, and grain size analysis. The correlation test was carried out on the distribution of quartz minerals, sediment grain size, and bathymetry using the Pearson correlation test. The results of the Pearson correlation test generally have a strong correlation between the distribution of quartz minerals with bathymetry and sediment grain size. This occurs because quartz distribution in the study area is a product of sediment supply originating from the mainland Klabat Granite rocks.
HgI 2 nanostructures obtained hydrothermally for application in ionizing radiation detection Marí... more HgI 2 nanostructures obtained hydrothermally for application in ionizing radiation detection María Pérez Barthaburu, Isabel Galain, Ivana Aguiar et al.
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