In the valley of the Surkhob River, manifestations of modern geological processes, characterized by various forms of manifestation, are widely developed. Studying these processes is of utmost importance, primarily lan...In the valley of the Surkhob River, manifestations of modern geological processes, characterized by various forms of manifestation, are widely developed. Studying these processes is of utmost importance, primarily landslides, which are directly related to the loss of stability of rocks on the slopes. Landslide processes in the Surkhob River valley, regardless of their type, cause significant economic damage to the population and the economy, as well as negatively impacting human living conditions. The primary goal of this project is to map landslide susceptibility using a geographic information system and quantitative and semi-quantitative methods. Landslide susceptibility assessment of this research was conducted using slope (degree), aspect of the slope, curvature, stream power index, topographic wetness index, precipitation and altitude. Except for precipitation, which was collected from the world climate site, most of the causal elements were derived from DEM from the SRTM (Shuttle Radar Topography Mission) database, with cell sizes of 30 m. 416 landslides were discovered from satellite pictures of Google Earth Pro and then validated in the field to analyses the link between causative factors and landslide inventory. To measure the weights of each causal element, the frequency ratio (FR) and the analytical hierarchy process (AHP) were used. The quality of the landslide susceptibility map was determined using the Receiver Operating Characteristics curve (ROC), and the AUC value was determined to be 0.877. It is possible to use the landslide susceptibility map as an engineering and geological basis for establishing a national economic development plan for the territory of the Surkhob River valley.展开更多
The “X Well” is located in the Salawati Basin which is part of Western Papua. The interval of study is the Klasaman Formation that is characterized by thick sediment intercalated sandstones and shales. The movement ...The “X Well” is located in the Salawati Basin which is part of Western Papua. The interval of study is the Klasaman Formation that is characterized by thick sediment intercalated sandstones and shales. The movement of Sorong Fault strongly controlled the sedimentation of this formation. This study is very important to give a contribution for developing exploration prospect by predicting reservoir distribution since localized facies change may mark the distribution of sandstones. The current study aims: 1) to define the age of Klasaman Formation;2) to define the vertical facies;3) to define the sequence stratigraphy;and 4) to predict the lateral change of facies. Five nannofossil datum planes are found throughout the interval and cover the age Late Miocene to Early Pliocene. LO Sphenolithus abies points the age 3.65 Ma, LO Reticulofenestra pseudoumbilicus points the age 3.79 Ma, FO Pseudoemiliania lacunosa points the age 4 Ma, LO Discoaster quinqueramus and LO Discoaster berrgrenii point the age 5.59 Ma and Top of small Reticulofenestra Interval points the age 7.167 Ma. They define the NN11 up to NN16 Martini’s zonation. The age of Klasaman Formation is known as the uppermost Late Miocene to the Early Pliocene. Four facies can be identified, namely Upper Shoreface, Lower Shoreface, Offshore Transition and Offshore. The upper shoreface facies is characterized by thick and clean sandstones, about 2.41 - 20.64 meters thick, while the lower shoreface facies consists of predominantly very fine to fine-grained sandstones intercalated by siltstones and claystones. The offshore transition facies is marked by thick claystones and siltstones intercalated with thin sandstones, whilst the offshore facies is marked by thick laminated claystones. Nine Parasequences 4th order can be identified within study interval, namely Progradational Parasequence-1 to 2, Retrogradational Parasequence-3, Progradational Parasequence-4 to 6, Retrogradational Parasequence-7 to 9. They are bounded by Sequence Boundary-1 to 8. The upper shoreface sandstones of Parasequence-4 to 9 can be potential reservoir rocks in the Klasaman Formation since the sandstones are very thick and clean. The sediments of Klasaman Formation have been sourced from elevated highland in the northeast area, so the upper shoreface sandstones have changed become the offshore claystones from northeast to southwest. High sedimentation rate and rapid subsidence of the basin mark the deposition of Klasaman Formation especially during the deposition of Parasequence-6 to 9 as a result of Sorong Fault tectonics.展开更多
The Anamta field,the focus of this study,is a prolific hydrocarbon discovery in the offshore Kutei Basin,having yielded over 900 million barrels of oil equivalent(mmboe)from the Miocene fluvial-deltaic sandstone reser...The Anamta field,the focus of this study,is a prolific hydrocarbon discovery in the offshore Kutei Basin,having yielded over 900 million barrels of oil equivalent(mmboe)from the Miocene fluvial-deltaic sandstone reservoirs.One fifth of the total current producing wells drain gas from the deepest underoptimized Basal Tortonian Sandstones(BTS).Increased burial depth and change toward distal sandstone facies within the overall progradation package in the study area have always been considered detrimental to the flowability of deep Tortonian reservoir target.The objectives of this study are to integrate the parasequence sets and detrital mineral composition of the Tortonian Sandstones in order to build petrofacies units and articulate them with reservoir quality characterization based on the key physical properties of the sandstones,with specific focus placed on the BTS as the object of this study.Biostratigraphic markers in the wellbores were tied to seismic data to define depositional systems tracts of highstand(HST)01,02,03,lowstand(LST),transgressive(TST),and HST 04 and 05.QFL analysis of 77 thin sections and XRD reveals a shift from sublitharenite in the basal part to feldspathic litharenite and litharenite toward the upper Tortonian Sandstones.Qm-F-Lt,Qm-P-K,and Qp-Lv-Ls ternary plots indicate recycled-orogen provenance.By integrating the analyses of systems tracts and provenance with detailed descriptions of facies from core data,three distinct petrofacies were defined:(1)Basal,(2A)Middle,and(2B)Upper Tortonian Sandstones that hereinafter referred to as BTS,MTS and UTS.Principal component analysis(PCA)upon these petrofacies identified that permeability,siderite,and kaolinite are the key principal components(PC),while K-means clustering confirmed Petrofacies-1 is a high-quality reservoir with permeability ranging in 28-211 milli-Darcy(mD)and porosity between 12%and 20%.It is characterized by sublitharenite composition,minimal siderite/kaolinite,and fine-to slightly medium-grained size.These findings highlight Petrofacies-1 as a promising deep target for future delineation and exploration.展开更多
Turkey is a region of special interest for Devonian researchers because it comprises Laurasian and Gondwanan components situated on different but neighbouring tectonic blocks. The respective strata include a variety o...Turkey is a region of special interest for Devonian researchers because it comprises Laurasian and Gondwanan components situated on different but neighbouring tectonic blocks. The respective strata include a variety of facies representing different shelf to marginal marine and even continental environments.展开更多
Objective:To investigate radon emanation in geothermal manifestations around Mount Tampomas,West Java,Indonesia,and assess radon concentrations in soil and water samples.Methods:Radon measurements were conducted using...Objective:To investigate radon emanation in geothermal manifestations around Mount Tampomas,West Java,Indonesia,and assess radon concentrations in soil and water samples.Methods:Radon measurements were conducted using the Durridge Rad7 instrument,supplemented with a soil gas probe for in-situ soil radon measurements at a depth of 80 cm.In-situ water radon measurements were performed using the Rad Aqua instrument,while radon measurements for hot water samples were conducted separately.Radon measurements for hot water samples were corrected for decay using a radon decay correction factor.Results:The analysis of radon measurements revealed a wide range of concentrations in soil and water samples.Soil radon concentrations ranged from 15 Bq/m^(3)to 4,660 Bq/m^(3),with localized hotspots exhibiting exceptionally high concentrations.Water radon measurements showed elevated levels,ranging from 0.2 Bq/L to 13.4 Bq/L insitu,particularly in hot springs.In collected water samples,radon concentrations ranged from 1 Bq/L to 6 Bq/L.These combined results highlight significant variability in radon levels across different water sources influenced by geothermal activity.Conclusions:These findings indicate active emanation processes influenced by geological factors and underscore the role of subsurface geology and aquifer characteristics in radon transport mechanisms.The presence of localized radon hotspots suggests the need for comprehensive monitoring and proactive management strategies to mitigate environmental and public health risks associated with radon exposure.展开更多
文摘In the valley of the Surkhob River, manifestations of modern geological processes, characterized by various forms of manifestation, are widely developed. Studying these processes is of utmost importance, primarily landslides, which are directly related to the loss of stability of rocks on the slopes. Landslide processes in the Surkhob River valley, regardless of their type, cause significant economic damage to the population and the economy, as well as negatively impacting human living conditions. The primary goal of this project is to map landslide susceptibility using a geographic information system and quantitative and semi-quantitative methods. Landslide susceptibility assessment of this research was conducted using slope (degree), aspect of the slope, curvature, stream power index, topographic wetness index, precipitation and altitude. Except for precipitation, which was collected from the world climate site, most of the causal elements were derived from DEM from the SRTM (Shuttle Radar Topography Mission) database, with cell sizes of 30 m. 416 landslides were discovered from satellite pictures of Google Earth Pro and then validated in the field to analyses the link between causative factors and landslide inventory. To measure the weights of each causal element, the frequency ratio (FR) and the analytical hierarchy process (AHP) were used. The quality of the landslide susceptibility map was determined using the Receiver Operating Characteristics curve (ROC), and the AUC value was determined to be 0.877. It is possible to use the landslide susceptibility map as an engineering and geological basis for establishing a national economic development plan for the territory of the Surkhob River valley.
文摘The “X Well” is located in the Salawati Basin which is part of Western Papua. The interval of study is the Klasaman Formation that is characterized by thick sediment intercalated sandstones and shales. The movement of Sorong Fault strongly controlled the sedimentation of this formation. This study is very important to give a contribution for developing exploration prospect by predicting reservoir distribution since localized facies change may mark the distribution of sandstones. The current study aims: 1) to define the age of Klasaman Formation;2) to define the vertical facies;3) to define the sequence stratigraphy;and 4) to predict the lateral change of facies. Five nannofossil datum planes are found throughout the interval and cover the age Late Miocene to Early Pliocene. LO Sphenolithus abies points the age 3.65 Ma, LO Reticulofenestra pseudoumbilicus points the age 3.79 Ma, FO Pseudoemiliania lacunosa points the age 4 Ma, LO Discoaster quinqueramus and LO Discoaster berrgrenii point the age 5.59 Ma and Top of small Reticulofenestra Interval points the age 7.167 Ma. They define the NN11 up to NN16 Martini’s zonation. The age of Klasaman Formation is known as the uppermost Late Miocene to the Early Pliocene. Four facies can be identified, namely Upper Shoreface, Lower Shoreface, Offshore Transition and Offshore. The upper shoreface facies is characterized by thick and clean sandstones, about 2.41 - 20.64 meters thick, while the lower shoreface facies consists of predominantly very fine to fine-grained sandstones intercalated by siltstones and claystones. The offshore transition facies is marked by thick claystones and siltstones intercalated with thin sandstones, whilst the offshore facies is marked by thick laminated claystones. Nine Parasequences 4th order can be identified within study interval, namely Progradational Parasequence-1 to 2, Retrogradational Parasequence-3, Progradational Parasequence-4 to 6, Retrogradational Parasequence-7 to 9. They are bounded by Sequence Boundary-1 to 8. The upper shoreface sandstones of Parasequence-4 to 9 can be potential reservoir rocks in the Klasaman Formation since the sandstones are very thick and clean. The sediments of Klasaman Formation have been sourced from elevated highland in the northeast area, so the upper shoreface sandstones have changed become the offshore claystones from northeast to southwest. High sedimentation rate and rapid subsidence of the basin mark the deposition of Klasaman Formation especially during the deposition of Parasequence-6 to 9 as a result of Sorong Fault tectonics.
文摘The Anamta field,the focus of this study,is a prolific hydrocarbon discovery in the offshore Kutei Basin,having yielded over 900 million barrels of oil equivalent(mmboe)from the Miocene fluvial-deltaic sandstone reservoirs.One fifth of the total current producing wells drain gas from the deepest underoptimized Basal Tortonian Sandstones(BTS).Increased burial depth and change toward distal sandstone facies within the overall progradation package in the study area have always been considered detrimental to the flowability of deep Tortonian reservoir target.The objectives of this study are to integrate the parasequence sets and detrital mineral composition of the Tortonian Sandstones in order to build petrofacies units and articulate them with reservoir quality characterization based on the key physical properties of the sandstones,with specific focus placed on the BTS as the object of this study.Biostratigraphic markers in the wellbores were tied to seismic data to define depositional systems tracts of highstand(HST)01,02,03,lowstand(LST),transgressive(TST),and HST 04 and 05.QFL analysis of 77 thin sections and XRD reveals a shift from sublitharenite in the basal part to feldspathic litharenite and litharenite toward the upper Tortonian Sandstones.Qm-F-Lt,Qm-P-K,and Qp-Lv-Ls ternary plots indicate recycled-orogen provenance.By integrating the analyses of systems tracts and provenance with detailed descriptions of facies from core data,three distinct petrofacies were defined:(1)Basal,(2A)Middle,and(2B)Upper Tortonian Sandstones that hereinafter referred to as BTS,MTS and UTS.Principal component analysis(PCA)upon these petrofacies identified that permeability,siderite,and kaolinite are the key principal components(PC),while K-means clustering confirmed Petrofacies-1 is a high-quality reservoir with permeability ranging in 28-211 milli-Darcy(mD)and porosity between 12%and 20%.It is characterized by sublitharenite composition,minimal siderite/kaolinite,and fine-to slightly medium-grained size.These findings highlight Petrofacies-1 as a promising deep target for future delineation and exploration.
文摘Turkey is a region of special interest for Devonian researchers because it comprises Laurasian and Gondwanan components situated on different but neighbouring tectonic blocks. The respective strata include a variety of facies representing different shelf to marginal marine and even continental environments.
基金supported by the Research Center for Geotechnology,Indonesian Institute of Science,through the Directorate of Research,Development,and Innovation under the DIPA(Daftar Isian Pelaksanaan Anggaran)annual budget allocationprovided by the Ministry of Research,Technology,and Higher Education of Indonesia,as well as the Indonesia Endowment Funds for Education(LPDP-Lembaga Pengelola Dana Pendidikan)-BRIN(Badan Riset dan Inovasi Nasional)through the Riset Inovasi untuk Indonesia Maju(RIIM)Grant No.RIIM-16(E.D.N).
文摘Objective:To investigate radon emanation in geothermal manifestations around Mount Tampomas,West Java,Indonesia,and assess radon concentrations in soil and water samples.Methods:Radon measurements were conducted using the Durridge Rad7 instrument,supplemented with a soil gas probe for in-situ soil radon measurements at a depth of 80 cm.In-situ water radon measurements were performed using the Rad Aqua instrument,while radon measurements for hot water samples were conducted separately.Radon measurements for hot water samples were corrected for decay using a radon decay correction factor.Results:The analysis of radon measurements revealed a wide range of concentrations in soil and water samples.Soil radon concentrations ranged from 15 Bq/m^(3)to 4,660 Bq/m^(3),with localized hotspots exhibiting exceptionally high concentrations.Water radon measurements showed elevated levels,ranging from 0.2 Bq/L to 13.4 Bq/L insitu,particularly in hot springs.In collected water samples,radon concentrations ranged from 1 Bq/L to 6 Bq/L.These combined results highlight significant variability in radon levels across different water sources influenced by geothermal activity.Conclusions:These findings indicate active emanation processes influenced by geological factors and underscore the role of subsurface geology and aquifer characteristics in radon transport mechanisms.The presence of localized radon hotspots suggests the need for comprehensive monitoring and proactive management strategies to mitigate environmental and public health risks associated with radon exposure.
