Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(2).05
Hung Phu Van, Nguyet T. A. Vu, Quynh Van Bui, Viet The Nguyen, Dat Quang Le
Groundwater from the basalt formations is the main source for the irrigation domestic use in Dak Lak province. Groundwater levels are important information for sustainable management water resouces in the region. The evolution of Groundwater level in the basalt aquifer in Dak Lak province is analyzed and evaluated by using the statistical test method. The results of the Mann-Kendall test indicated that the annual groundwater level had downward trend at 6/8 monitoring holes. The reduction was approximately from 0.03 m/year to 0.1 m/year at boreholes LK71T, LK29T, and CB1-II with high reliability in statistics (p-value < 10%). The downward trend also appeared at 6/8 observed boreholes in the rainy season (0.05÷0.2 m/year) and dry seasons (0.03÷0.15 m/year). Groundwater level changed, in this work, was interpreted and linked to precipitation data. Comparison with annual rainfall monitoring data during the period 2010÷2016 at three stations in the study area, the Pearson correlation coefficient showed that the changed in rainfall amount overtime govern the groundwater level in the study area. Specifically, the results have identified a close correlation between the groundwater level at the boreholes LK29T, C4a, LK71T, and LK75T with average rainfall in the dry season in the study area. The strong correlation continued to be maintained at 3/8 monitoring holes (C4a, LK29T, and LK75T) in rainy season. Mann-Kendall statistical method and Pearson correlation can be applied to analyze long-term Groundwater level changes for sustainable management and exploitation of groundwater resources.
{"title":"Trend analysis of groundwater levels in the monitoring boreholes within basalt formations in Dak Lak province","authors":"Hung Phu Van, Nguyet T. A. Vu, Quynh Van Bui, Viet The Nguyen, Dat Quang Le","doi":"10.46326/jmes.2023.64(2).05","DOIUrl":"https://doi.org/10.46326/jmes.2023.64(2).05","url":null,"abstract":"Groundwater from the basalt formations is the main source for the irrigation domestic use in Dak Lak province. Groundwater levels are important information for sustainable management water resouces in the region. The evolution of Groundwater level in the basalt aquifer in Dak Lak province is analyzed and evaluated by using the statistical test method. The results of the Mann-Kendall test indicated that the annual groundwater level had downward trend at 6/8 monitoring holes. The reduction was approximately from 0.03 m/year to 0.1 m/year at boreholes LK71T, LK29T, and CB1-II with high reliability in statistics (p-value < 10%). The downward trend also appeared at 6/8 observed boreholes in the rainy season (0.05÷0.2 m/year) and dry seasons (0.03÷0.15 m/year). Groundwater level changed, in this work, was interpreted and linked to precipitation data. Comparison with annual rainfall monitoring data during the period 2010÷2016 at three stations in the study area, the Pearson correlation coefficient showed that the changed in rainfall amount overtime govern the groundwater level in the study area. Specifically, the results have identified a close correlation between the groundwater level at the boreholes LK29T, C4a, LK71T, and LK75T with average rainfall in the dry season in the study area. The strong correlation continued to be maintained at 3/8 monitoring holes (C4a, LK29T, and LK75T) in rainy season. Mann-Kendall statistical method and Pearson correlation can be applied to analyze long-term Groundwater level changes for sustainable management and exploitation of groundwater resources.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134300040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(2).07
Hoan Ngoc Do, Hieu Quang Tran, A. Nguyen, Tho Anh Nguyen
In quarries for building material, the primary transportation mode is by truck due to its high mobility that is suitable for the actual terrain conditions of the mine. The characteristic of transportation work in these mines is the large amount of cargo transportation, steep slopes, small turning radius, and therefore always potential hazards and risks for workers at the mine. The article presents a method for evaluating the points to identify and assess the level of occupational safety and health risks in transportation activities in quarries for building material, based on which control solutions are proposed to ensure safety and occupational health during the production and business process of construction material mines. From identifying and evaluating the level of risks, they are quantified into risk levels to assess the potential loss of occupational safety at each specific stage of the transportation process in the mine. This is a quantitative method that allows for the easy evaluation of occupational safety and health risk levels through quantifiable values obtained by expert scoring and surveys of worker opinions at the production site. This evaluation is based on separate assessments of factors such as estimating the consequences of injury to workers, the frequency of occupational accidents, and the ability to recognize occupational hazards. Through this assessment, a classification table is proposed for workers to understand and implement occupational safety and health procedures correctly, avoiding occupational accidents and unnecessary occupational diseases.
{"title":"Hazard identification and risk assessment for occupational safety and health in the limestone quarries transportation","authors":"Hoan Ngoc Do, Hieu Quang Tran, A. Nguyen, Tho Anh Nguyen","doi":"10.46326/jmes.2023.64(2).07","DOIUrl":"https://doi.org/10.46326/jmes.2023.64(2).07","url":null,"abstract":"In quarries for building material, the primary transportation mode is by truck due to its high mobility that is suitable for the actual terrain conditions of the mine. The characteristic of transportation work in these mines is the large amount of cargo transportation, steep slopes, small turning radius, and therefore always potential hazards and risks for workers at the mine. The article presents a method for evaluating the points to identify and assess the level of occupational safety and health risks in transportation activities in quarries for building material, based on which control solutions are proposed to ensure safety and occupational health during the production and business process of construction material mines. From identifying and evaluating the level of risks, they are quantified into risk levels to assess the potential loss of occupational safety at each specific stage of the transportation process in the mine. This is a quantitative method that allows for the easy evaluation of occupational safety and health risk levels through quantifiable values obtained by expert scoring and surveys of worker opinions at the production site. This evaluation is based on separate assessments of factors such as estimating the consequences of injury to workers, the frequency of occupational accidents, and the ability to recognize occupational hazards. Through this assessment, a classification table is proposed for workers to understand and implement occupational safety and health procedures correctly, avoiding occupational accidents and unnecessary occupational diseases.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126820599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(2).06
Linh Khac Nguyen, Giap Van Doan, Tien Van Pham, Thang Hong Thi Le
Wheelchairs, trolley chairs, and potty chairs are essential for people with disabilities, patients, and elderly. These forms of equipments are specially designed to support specific needs of their users, such as moving, bathing, and resting, etc. Since the function of equipment is limitted, patients with multiple problems may need more than one single equipment to be properly supported, which make the caring processes more complicated because patients have to be transferred between equipment, also increase the cost on equipment. This paper presents a new design on a multi-purpose trolley chair to better support patient’s life. Multi-purpose trolley chair can be used as a lifting and transfering equipment, or supporting devices for moving, bathing of patients and elderly. The seat on multi-purpose trolley chair is seprated into 2 pieces and can be adjusted by a smart-locking system, the chair back can be flexibility rotated back and front, and the whole seating set is installed on a mechanic lifting mechanism to better fit and comfort patients with different sitting modes to satisfies required medical treatment positions or easier moving, Moreover, this device can be placed in the bedroom as a regular toilet seat, helping patients avoid having to travel far when they are alone. Combining with the use of computational software for structural analysis, such as NX and SAP2000, to optimize the design, the calculation and design process can be done quickly with the aim of reducing the weight of the vehicle while ensuring durability, rigidity, and safety during operation. Conducting this research is an initial basis to quickly bring the versatile patient care wheelchair product into practice.
{"title":"A new design on a multi - purpose trolley chair to support patients’ care process","authors":"Linh Khac Nguyen, Giap Van Doan, Tien Van Pham, Thang Hong Thi Le","doi":"10.46326/jmes.2023.64(2).06","DOIUrl":"https://doi.org/10.46326/jmes.2023.64(2).06","url":null,"abstract":"Wheelchairs, trolley chairs, and potty chairs are essential for people with disabilities, patients, and elderly. These forms of equipments are specially designed to support specific needs of their users, such as moving, bathing, and resting, etc. Since the function of equipment is limitted, patients with multiple problems may need more than one single equipment to be properly supported, which make the caring processes more complicated because patients have to be transferred between equipment, also increase the cost on equipment. This paper presents a new design on a multi-purpose trolley chair to better support patient’s life. Multi-purpose trolley chair can be used as a lifting and transfering equipment, or supporting devices for moving, bathing of patients and elderly. The seat on multi-purpose trolley chair is seprated into 2 pieces and can be adjusted by a smart-locking system, the chair back can be flexibility rotated back and front, and the whole seating set is installed on a mechanic lifting mechanism to better fit and comfort patients with different sitting modes to satisfies required medical treatment positions or easier moving, Moreover, this device can be placed in the bedroom as a regular toilet seat, helping patients avoid having to travel far when they are alone. Combining with the use of computational software for structural analysis, such as NX and SAP2000, to optimize the design, the calculation and design process can be done quickly with the aim of reducing the weight of the vehicle while ensuring durability, rigidity, and safety during operation. Conducting this research is an initial basis to quickly bring the versatile patient care wheelchair product into practice.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130067486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(2).04
Thang Hong Do, Phong Van Nguyen
Information on geology and engineering plays an important role in construction activities, forecasting adverse problems, and choosing the foundation solutions. The management and use of this information on the basis of zoning geological conditions will contribute to ensure the sustainability in economic exploitation of the territory in general and in construction development in particular. This paper presents the results of analysis, evaluation, and systematization of geological, tectonic, geomorphological, hydrogeological, and engineering geological data in Hai Duong province from the point of view of engineering geology. In particular, the geological conditions for construction are evaluated on the basis of classification of soil and rock of F.P Xavarenski and standard TCVN 9362-2012. Accordingly, soil and rock in the study area are divided into 5 groups: hard rock (I), semi-hard rock (II), cohesiveless soil (III), cohesive soil (IV) and soft soil (V) and then they are classified according to construction properties. Applying the partitioning method of I.V. Popov, the geotechnical conditions of the study area are divided into 3 zones: I, II, III and 3 sub-zones (III.a, III.b, III.c). On that basis, engineering geology problems in each zone and sub-zone are analyzed and evaluated as the basis for planning, serving for digitization and integration relating to digitized maps.
{"title":"Geotechnical zoning in Hai Duong province for construction planning","authors":"Thang Hong Do, Phong Van Nguyen","doi":"10.46326/jmes.2023.64(2).04","DOIUrl":"https://doi.org/10.46326/jmes.2023.64(2).04","url":null,"abstract":"Information on geology and engineering plays an important role in construction activities, forecasting adverse problems, and choosing the foundation solutions. The management and use of this information on the basis of zoning geological conditions will contribute to ensure the sustainability in economic exploitation of the territory in general and in construction development in particular. This paper presents the results of analysis, evaluation, and systematization of geological, tectonic, geomorphological, hydrogeological, and engineering geological data in Hai Duong province from the point of view of engineering geology. In particular, the geological conditions for construction are evaluated on the basis of classification of soil and rock of F.P Xavarenski and standard TCVN 9362-2012. Accordingly, soil and rock in the study area are divided into 5 groups: hard rock (I), semi-hard rock (II), cohesiveless soil (III), cohesive soil (IV) and soft soil (V) and then they are classified according to construction properties. Applying the partitioning method of I.V. Popov, the geotechnical conditions of the study area are divided into 3 zones: I, II, III and 3 sub-zones (III.a, III.b, III.c). On that basis, engineering geology problems in each zone and sub-zone are analyzed and evaluated as the basis for planning, serving for digitization and integration relating to digitized maps.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122862605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(1).08
A. Le, N. Bui
Submarine slide and polygonal faults have been investigated using high-resolution 3D seismic data, over an area of 2,300 km2. The study area is located on the continental slope, offshore Norway. Submarine sliding covers more than half of the study area, and is part of the Storage slide. The slide developed a series of extensional faults at the upper extensional zone which is gradually changed to chaos seismic facies, interpreted as mass transport deposits. There is no clear evidence of compression/contractional zone downslope. Polygonal faults are highly developed in the KS1 and KS2 interval, corresponding to the Lower Miocene age. The fault has small offset of c. 10÷30 ms TWT, spacing ranges between c. 500 m and 1 km. Within this faulted interval, faults tend to develop intensively below the submarine sliding and much less out of that area. Bright amplitude anomalies are observed within the north south – elongated anticline structure. It has been mapped over an area of c. 135 km2 coinciding with the top anticline. Among those, there are two obvious negatives, bright amplitude reflectors which are relatively flat at 2670 ms TWT (flat spot 1) and 2800 ms TWT (flat spot 2). These flat spots are interpreted as hydrocarbon-brine contacts. Flat spot 2 is bounded by the structure contour but there is no evidence for the unconformable with the lithologic reflections from the trap boundary, thus this still needs to be confirmed by well data. Bright amplitude anomalies suggest the existence of hydrocarbon in the trap, in addition, the occurrence of polygonal faults is linked to seal potential covering the underneath petroleum reservoir, proving the great hydrocarbon potential in this area.
利用高分辨率三维地震数据，对2300平方公里范围内的海底滑动和多边形断层进行了调查。研究区位于挪威近海的大陆斜坡上。海底滑梯覆盖了研究区域的一半以上，是储存滑梯的一部分。滑块在上拉张带发育一系列伸展断裂，逐渐转变为混沌地震相，可解释为块体搬运沉积。没有明显的压缩/收缩带下坡的证据。KS1和KS2段多边形断裂高度发育，对应于下中新世。断层偏移量较小，约为c. 10÷30 ms行波管，断层间距在c. 500 m ~ 1 km之间。在这一断裂带内，断层往往集中在海底滑动带下方发育，而在该区域外则较少发育。在南北向伸长背斜构造内观察到明显的振幅异常。它已被绘制在与顶部背斜相吻合的约135平方公里的面积上。其中，有两个明显的负值，即在2670 ms行波时间(平斑1)和2800 ms行波时间(平斑2)相对平坦的明亮振幅反射体，这些平斑被解释为油气-盐水接触。平斑2以构造等值线为界，但未见与圈闭界岩性反射不整合的证据，仍需通过井资料加以证实。亮幅异常提示圈闭内有油气存在，多面体断裂的出现与覆盖下方油气藏的封闭势有关，说明该区具有较大的油气潜力。
{"title":"Submarine landslide and associated polygonal faults development: a case study from offshore Norway","authors":"A. Le, N. Bui","doi":"10.46326/jmes.2023.64(1).08","DOIUrl":"https://doi.org/10.46326/jmes.2023.64(1).08","url":null,"abstract":"Submarine slide and polygonal faults have been investigated using high-resolution 3D seismic data, over an area of 2,300 km2. The study area is located on the continental slope, offshore Norway. Submarine sliding covers more than half of the study area, and is part of the Storage slide. The slide developed a series of extensional faults at the upper extensional zone which is gradually changed to chaos seismic facies, interpreted as mass transport deposits. There is no clear evidence of compression/contractional zone downslope. Polygonal faults are highly developed in the KS1 and KS2 interval, corresponding to the Lower Miocene age. The fault has small offset of c. 10÷30 ms TWT, spacing ranges between c. 500 m and 1 km. Within this faulted interval, faults tend to develop intensively below the submarine sliding and much less out of that area. Bright amplitude anomalies are observed within the north south – elongated anticline structure. It has been mapped over an area of c. 135 km2 coinciding with the top anticline. Among those, there are two obvious negatives, bright amplitude reflectors which are relatively flat at 2670 ms TWT (flat spot 1) and 2800 ms TWT (flat spot 2). These flat spots are interpreted as hydrocarbon-brine contacts. Flat spot 2 is bounded by the structure contour but there is no evidence for the unconformable with the lithologic reflections from the trap boundary, thus this still needs to be confirmed by well data. Bright amplitude anomalies suggest the existence of hydrocarbon in the trap, in addition, the occurrence of polygonal faults is linked to seal potential covering the underneath petroleum reservoir, proving the great hydrocarbon potential in this area.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125169528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(1).02
Cuong Duy Tong, L. Hoang, Dung Viet Bui, Huyen Dieu Thi Pham, T. T. Nguyen
Northern Song Hong Tertiary Sedimentary basin is a classic case study of a pull-apart basin in southeast Asia, whose formation was controlled by the India-Eurasia collision, sinistral and dextral strike-slip motion of the Ailao Shan-Red River Shear Zone and Opening of the East Vietnam Sea during the Cenozoic. Unlike the central and southern parts of the basin, the northern Song Hong Basin experienced a very strong inversion during the Late Miocene. This rapid uplift of the region has led to significantly change in lithofacies and sedimentary environments, which are now still poorly understood. This uncertainty is considered one of the main challingings in prediction of the non-structural traps in the region. The recent results derived from well logging and 2D/3D seismic interpretation allowed us to define the Miocene formation in northern Song Hong basin, which are subdivided into three substrata, namely: the Lower, Middle and Upper stratum, which are characterized by typical characteristics of lithology and depositional environments. The Lower Miocene formation is dominated by deltaic environment at the bottom, transitioning to the overlying shelf environment. Lithology of the section varies from coarse-grained sediment (sandstone) to fine grained material such as shale and mudstone upward; The Middle Miocene stratum demonstrate sandier, coalic materials of the delta plain and delta front environments intercalated with swampy shale. In contrast, the Upper Miocene section is characterized by more fluvial and nearshore elements. It is illustrated by presence of the channel-filled sand bodies and mouth/longshore sand bars. These sand bodies demonstrate good porosity and horizontal permeability, which are considered to be good potential reservoir for both structural and non-structural traps in the Miocene formation.
{"title":"Depositional environments of the Miocene sediments in northern Song Hong basin","authors":"Cuong Duy Tong, L. Hoang, Dung Viet Bui, Huyen Dieu Thi Pham, T. T. Nguyen","doi":"10.46326/jmes.2023.64(1).02","DOIUrl":"https://doi.org/10.46326/jmes.2023.64(1).02","url":null,"abstract":"Northern Song Hong Tertiary Sedimentary basin is a classic case study of a pull-apart basin in southeast Asia, whose formation was controlled by the India-Eurasia collision, sinistral and dextral strike-slip motion of the Ailao Shan-Red River Shear Zone and Opening of the East Vietnam Sea during the Cenozoic. Unlike the central and southern parts of the basin, the northern Song Hong Basin experienced a very strong inversion during the Late Miocene. This rapid uplift of the region has led to significantly change in lithofacies and sedimentary environments, which are now still poorly understood. This uncertainty is considered one of the main challingings in prediction of the non-structural traps in the region. The recent results derived from well logging and 2D/3D seismic interpretation allowed us to define the Miocene formation in northern Song Hong basin, which are subdivided into three substrata, namely: the Lower, Middle and Upper stratum, which are characterized by typical characteristics of lithology and depositional environments. The Lower Miocene formation is dominated by deltaic environment at the bottom, transitioning to the overlying shelf environment. Lithology of the section varies from coarse-grained sediment (sandstone) to fine grained material such as shale and mudstone upward; The Middle Miocene stratum demonstrate sandier, coalic materials of the delta plain and delta front environments intercalated with swampy shale. In contrast, the Upper Miocene section is characterized by more fluvial and nearshore elements. It is illustrated by presence of the channel-filled sand bodies and mouth/longshore sand bars. These sand bodies demonstrate good porosity and horizontal permeability, which are considered to be good potential reservoir for both structural and non-structural traps in the Miocene formation.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134331637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(1).10
Hiep Huu Hoang, Thang Van Nguyen, Nam Huu Nguyen, Viet Tuan Le, Hoai Trung Pham
An Chau trough with an area of about 10,000 km2 located in the Northeast of Vietnam is the southwest tail of the Mesozoic Thap Van Dai Son basin and has a complex geological structure. The geological structure of An Chau trough has been studied since the 70s of the last century, however, previous studies were mainly surface geological studies. Deep structure studies only based on measurement gravity data at the scale of 1/200.000 with outdated machinery, equipment and processing technology. With the goal of re-searching, investigating and surveying oil and gas resources, from 2013 to 2017, Vietnam National Oil and Gas Group has deployed measuring over 9,000 km of the Airbone high-resolution Mag-Gravity survey with the resolution of measuring points on the measure-line from 6 m to 7 m/point, more than 450 ground gravimetric points and acquiring over 1,000 km 2D seismic survey. All magnetic-gravity and seismic data collected in the field is then processed at processing centers with modern technology such as Sander Geophysics - Canada, Institute of Geophysics - VAST, CGG Veritas Singapore. The results of interpretation and integration of these new documents together with the previous geological documents have initially allowed to identify and construct a deep geological model of An Chau trough. The results of this study will help clarify the history of geological development of the study area based on evidences that can only be observed on seismic data. Inaddition, these results also help to make orientation for explorating mineral resources in general and oil and gas resources in particular.
{"title":"Deep geological structure of An Chau trough base on new study data","authors":"Hiep Huu Hoang, Thang Van Nguyen, Nam Huu Nguyen, Viet Tuan Le, Hoai Trung Pham","doi":"10.46326/jmes.2023.64(1).10","DOIUrl":"https://doi.org/10.46326/jmes.2023.64(1).10","url":null,"abstract":"An Chau trough with an area of about 10,000 km2 located in the Northeast of Vietnam is the southwest tail of the Mesozoic Thap Van Dai Son basin and has a complex geological structure. The geological structure of An Chau trough has been studied since the 70s of the last century, however, previous studies were mainly surface geological studies. Deep structure studies only based on measurement gravity data at the scale of 1/200.000 with outdated machinery, equipment and processing technology. With the goal of re-searching, investigating and surveying oil and gas resources, from 2013 to 2017, Vietnam National Oil and Gas Group has deployed measuring over 9,000 km of the Airbone high-resolution Mag-Gravity survey with the resolution of measuring points on the measure-line from 6 m to 7 m/point, more than 450 ground gravimetric points and acquiring over 1,000 km 2D seismic survey. All magnetic-gravity and seismic data collected in the field is then processed at processing centers with modern technology such as Sander Geophysics - Canada, Institute of Geophysics - VAST, CGG Veritas Singapore. The results of interpretation and integration of these new documents together with the previous geological documents have initially allowed to identify and construct a deep geological model of An Chau trough. The results of this study will help clarify the history of geological development of the study area based on evidences that can only be observed on seismic data. Inaddition, these results also help to make orientation for explorating mineral resources in general and oil and gas resources in particular.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114201618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(1).05
Man Quang Ha, H. M. Nguyen, Dung Viet Bui, Hong Viet Nguyen, Hoa Khac Truong, N. Pham
Understanding the permeability-porosity relationships is the key to improving reservoir prediction and exploitation especially in carbonate reservoirs, which are known for their complex textural and diagenetic variation. Rock type classifications have long been proven to be an effective technique for establishing permeability- porosity relationships, enhance the capability to capture the various reservoir flow behavior and prediction for uncored reservoir zones. This study highlights some of those practical and theoretically-correct methods, such as Hydraulic Flow Unit (HFU); Global hydraulic element (GHE), Winland’s R35 method, Pittman method, Lucia method. They are proposed and tested for identification and characterization of the rock types using a database of 555 core plugs from the Miocene carbonate reservoir in the Nam Con Son basin. It is a large isolated carbonate build-up structure which were deposited within a shallow marine platform interior and are dominated by coral, red algal and foraminiferal packstones, wackestones and grainstones. Hydrocarbons in this reservoir have been found in the upper most part of the late Miocene formation. Conventional core data were first used to define and display the cross plot of permeability and porosity. Different charts and cutoff thresholds were used to classified, defined number of rock type and the linear and non-linear equations were established. The predicted core permeability was calculated using different methods and compared with the actual core permeability for each rock type. The predicted reservoir rock type and permeability predictions of HFU method was recognized to give better matching of measured core permeability with coefficient of more than 89%.
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Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(1).01
Nga Hoai Le, Huyen Dieu Thi Pham, Lan Nguyen
Blocks 10 and 11.1 are located at the western boundary of the Nam Con Son basin, offshore southern Vietnam. Hydrocarbon shows have been encountered in many wells as the Gau Chua (GC), Ca Cho (CC), Gau Ngua (GN), Phi Ma (PM), Than Ma (TM), etc. In the CC and GN fields, the oil and gas were discovered in Miocene sandstone reservoirs and in fractured granite basement. The Cau and Dua formations are active source rocks in this area. Oil and gas discovered in wells were generated from coal and coaly claystone sediments which deposited under oxidation conditions to weak reducing in fluvio-delta to estuarine environments, in which land plants develop very abundantly. The 2D modeling results suggested that hydrocarbons discovered in the study area mainly derived from the local source rocks. The large quantity of hydrocarbons yields from source rocks in deeper part of southeastern kitchen migrated both vertically and laterally into the overlaying formations. Hydrocarbon strongly migrated lost through open fault. Prospects located near kitchen can trap hydrocarbons if they have a good seal. Block 10 and western block 11.1 face high risk of hydrocarbon charge due to the distance from the kitchen, weak top seal and fault seal. Of seal scenario, the composition of hydrocarbons accumulated in GC structure contains 87.5% volume of liquid and 12.5% volume of gas that derived from local Oligocene source rock. The composition of hydrocarbons in accumulation in CT (Ca Ty) structure of contains 99% volume of liquid and 92.5% volume of gas that derived from local Oligocene source rock.
区块10和11.1位于越南南部海上Nam Con Son盆地的西部边界。在Gau Chua (GC)、Ca Cho (CC)、Gau Ngua (GN)、Phi Ma (PM)、Than Ma (TM)等井中都遇到过油气显示。在CC和GN地区，油气主要分布在中新统砂岩储层和裂缝性花岗岩基底中。Cau组和Dua组是本区活跃的烃源岩。井中发现的油气来自于河流三角洲到河口环境中，在氧化条件下沉积到弱还原条件下的煤和煤质粘土岩沉积物，在河口环境中陆生植物发育非常丰富。二维模拟结果表明，研究区发现的油气主要来源于本地烃源岩。东南缘深层烃源岩产出的大量油气在纵向和横向上向上覆地层运移。油气运移剧烈，通过开放断层丢失。位于厨房附近的勘探区如果密封良好，可以圈闭碳氢化合物。10区块和11.1西部区块距离厨房较远，顶部密封和断层密封薄弱，油气充注风险较高。在封闭情景下，气相构造成藏的油气成分中，87.5%的液体体积和12.5%的气体体积来自于局部渐新统烃源岩。CT (Ca - Ty)构造成藏烃的组成中，99%的液体体积和92.5%的气体体积来自于局部渐新统烃源岩。
{"title":"Thermal maturity modelling for the source rocks in blocks 10 and 11.1, Nam Con Son basin","authors":"Nga Hoai Le, Huyen Dieu Thi Pham, Lan Nguyen","doi":"10.46326/jmes.2023.64(1).01","DOIUrl":"https://doi.org/10.46326/jmes.2023.64(1).01","url":null,"abstract":"Blocks 10 and 11.1 are located at the western boundary of the Nam Con Son basin, offshore southern Vietnam. Hydrocarbon shows have been encountered in many wells as the Gau Chua (GC), Ca Cho (CC), Gau Ngua (GN), Phi Ma (PM), Than Ma (TM), etc. In the CC and GN fields, the oil and gas were discovered in Miocene sandstone reservoirs and in fractured granite basement. The Cau and Dua formations are active source rocks in this area. Oil and gas discovered in wells were generated from coal and coaly claystone sediments which deposited under oxidation conditions to weak reducing in fluvio-delta to estuarine environments, in which land plants develop very abundantly. The 2D modeling results suggested that hydrocarbons discovered in the study area mainly derived from the local source rocks. The large quantity of hydrocarbons yields from source rocks in deeper part of southeastern kitchen migrated both vertically and laterally into the overlaying formations. Hydrocarbon strongly migrated lost through open fault. Prospects located near kitchen can trap hydrocarbons if they have a good seal. Block 10 and western block 11.1 face high risk of hydrocarbon charge due to the distance from the kitchen, weak top seal and fault seal. Of seal scenario, the composition of hydrocarbons accumulated in GC structure contains 87.5% volume of liquid and 12.5% volume of gas that derived from local Oligocene source rock. The composition of hydrocarbons in accumulation in CT (Ca Ty) structure of contains 99% volume of liquid and 92.5% volume of gas that derived from local Oligocene source rock.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126357206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.46326/jmes.2023.64(1).07
K. P. Nguyen, Khuong An Pham Nguyen, Huyen T T Luong, Minh Ha Tran
In fields with increasing water cut and depleting reservoir energy, Electric Submersible Pump (ESP) installation is a sustainable production option. It helps to extend life of the wells by lower abandonment pressure and therefore increases the recovery factor. In addition, the gas lift saving from ESP conversion wells could be utilized to optimize others wells’ productivity thus boosting the total field production. Over the last 9 years, Cuu Long JOC has been conducted 5 ESP campaigns in fractured granitic basement reservoirs which bringing full of surprises. The selected field for ESP pilot was brought on production initially in 2008 with over 75,000 bopd. However, water breakthrough occurred after 8 months quickly reduced the total field production to 5,000 bopd in 2013. At the time of ESP conversion, gas lift have already optimized and it is not sufficient to maintain the rate as most of wells flowed with 95% water cut. With ESP application, the wells were able to reach 12,000 blpd and reduce the water cut not only for itself but also for adjacent wells. Despite the pump average run life is not meet the expectation, ESP application shows better efficiency in term of oil production compared to gas lift under the same reservoir conditions. This paper summarizes a process of ESP application in high temperature environment including candidate selection, ESP design and actual production performance. The learning and experience developed from 11 ESPs installation provide an insight about the potential of ESP use for oil production in fractured basement reservoir.
在含水不断增加、油藏能量不断消耗的油田，安装电潜泵(ESP)是一种可持续的生产选择。它通过降低弃井压力来延长油井寿命，从而提高采收率。此外，ESP转换井节省的气举可以用来优化其他井的产能，从而提高油田总产量。在过去的9年里，Cuu Long JOC在裂缝性花岗岩基底储层中进行了5次ESP作业，带来了许多惊喜。选定的ESP试验田最初于2008年投产，产量超过75000桶。然而，2013年8个月后，该油田的产量迅速下降至5000桶/天。在ESP转换时，气举已经进行了优化，但由于大多数井的含水率为95%，气举不足以保持速度。通过ESP的应用，这些井的产量达到了12000桶/天，不仅降低了自身的含水率，也降低了相邻井的含水率。尽管ESP的平均运行寿命没有达到预期，但在相同的储层条件下，与气举相比，ESP的产油效率更高。概述了高温环境下电潜泵的选型、设计和实际生产性能。从11台ESP的安装过程中获得的经验和教训，让我们了解了ESP在裂缝性基底油藏中采油的潜力。
{"title":"ESP Application for Oil Production in Naturally Fractured Granitic Basement Reservoir","authors":"K. P. Nguyen, Khuong An Pham Nguyen, Huyen T T Luong, Minh Ha Tran","doi":"10.46326/jmes.2023.64(1).07","DOIUrl":"https://doi.org/10.46326/jmes.2023.64(1).07","url":null,"abstract":"In fields with increasing water cut and depleting reservoir energy, Electric Submersible Pump (ESP) installation is a sustainable production option. It helps to extend life of the wells by lower abandonment pressure and therefore increases the recovery factor. In addition, the gas lift saving from ESP conversion wells could be utilized to optimize others wells’ productivity thus boosting the total field production. Over the last 9 years, Cuu Long JOC has been conducted 5 ESP campaigns in fractured granitic basement reservoirs which bringing full of surprises. The selected field for ESP pilot was brought on production initially in 2008 with over 75,000 bopd. However, water breakthrough occurred after 8 months quickly reduced the total field production to 5,000 bopd in 2013. At the time of ESP conversion, gas lift have already optimized and it is not sufficient to maintain the rate as most of wells flowed with 95% water cut. With ESP application, the wells were able to reach 12,000 blpd and reduce the water cut not only for itself but also for adjacent wells. Despite the pump average run life is not meet the expectation, ESP application shows better efficiency in term of oil production compared to gas lift under the same reservoir conditions. This paper summarizes a process of ESP application in high temperature environment including candidate selection, ESP design and actual production performance. The learning and experience developed from 11 ESPs installation provide an insight about the potential of ESP use for oil production in fractured basement reservoir.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"54 19","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113957362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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